<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with WebFilings-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://enphase.com/role/CommitmentsAndContingencies" xlink:href="enph-20130930.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/CondensedConsolidatedBalanceSheetsUnaudited" xlink:href="enph-20130930.xsd#CondensedConsolidatedBalanceSheetsUnaudited" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical" xlink:href="enph-20130930.xsd#CondensedConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited" xlink:href="enph-20130930.xsd#CondensedConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/CondensedConsolidatedStatementsOfComprehensiveLossUnaudited" xlink:href="enph-20130930.xsd#CondensedConsolidatedStatementsOfComprehensiveLossUnaudited" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/CondensedConsolidatedStatementsOfOperationsUnaudited" xlink:href="enph-20130930.xsd#CondensedConsolidatedStatementsOfOperationsUnaudited" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/DocumentAndEntityInformation" xlink:href="enph-20130930.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/FairValueMeasurements" xlink:href="enph-20130930.xsd#FairValueMeasurements" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/FairValueMeasurementsDetails" xlink:href="enph-20130930.xsd#FairValueMeasurementsDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/FairValueMeasurementsDetailsTextual" xlink:href="enph-20130930.xsd#FairValueMeasurementsDetailsTextual" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/FairValueMeasurementsTables" xlink:href="enph-20130930.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/IncomeTaxes" xlink:href="enph-20130930.xsd#IncomeTaxes" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/IncomeTaxesDetails" xlink:href="enph-20130930.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/Inventory" xlink:href="enph-20130930.xsd#Inventory" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/InventoryDetails" xlink:href="enph-20130930.xsd#InventoryDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/InventoryTables" xlink:href="enph-20130930.xsd#InventoryTables" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/LongTermDebt" xlink:href="enph-20130930.xsd#LongTermDebt" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/LongTermDebtDetails" xlink:href="enph-20130930.xsd#LongTermDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/LongTermDebtDetailsTextual" xlink:href="enph-20130930.xsd#LongTermDebtDetailsTextual" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/LongTermDebtTables" xlink:href="enph-20130930.xsd#LongTermDebtTables" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/NetLossPerShareAttributableToCommonStockholders" xlink:href="enph-20130930.xsd#NetLossPerShareAttributableToCommonStockholders" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/NetLossPerShareAttributableToCommonStockholdersDetails" xlink:href="enph-20130930.xsd#NetLossPerShareAttributableToCommonStockholdersDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/NetLossPerShareAttributableToCommonStockholdersDetailsTextual" xlink:href="enph-20130930.xsd#NetLossPerShareAttributableToCommonStockholdersDetailsTextual" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/NetLossPerShareAttributableToCommonStockholdersTables" xlink:href="enph-20130930.xsd#NetLossPerShareAttributableToCommonStockholdersTables" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/OverviewAndSummaryOfAccountingPoliciesDetails" xlink:href="enph-20130930.xsd#OverviewAndSummaryOfAccountingPoliciesDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/OverviewAndSummaryOfSignificantAccountingPolicies" xlink:href="enph-20130930.xsd#OverviewAndSummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/OverviewAndSummaryOfSignificantAccountingPoliciesPolicies" xlink:href="enph-20130930.xsd#OverviewAndSummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/RelatedPartyTransactions" xlink:href="enph-20130930.xsd#RelatedPartyTransactions" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/RelatedPartyTransactionsDetails" xlink:href="enph-20130930.xsd#RelatedPartyTransactionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/StockBasedCompensation" xlink:href="enph-20130930.xsd#StockBasedCompensation" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/StockBasedCompensationComponentsOfStockBasedCompensationExpenseByReportLineDetails" xlink:href="enph-20130930.xsd#StockBasedCompensationComponentsOfStockBasedCompensationExpenseByReportLineDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/StockBasedCompensationDetailsTextual" xlink:href="enph-20130930.xsd#StockBasedCompensationDetailsTextual" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/StockBasedCompensationExpenseByAwardTypeDetails" xlink:href="enph-20130930.xsd#StockBasedCompensationExpenseByAwardTypeDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/StockBasedCompensationRestrictedStockUnitActivityDetails" xlink:href="enph-20130930.xsd#StockBasedCompensationRestrictedStockUnitActivityDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/StockBasedCompensationStockOptionActivityDetails" xlink:href="enph-20130930.xsd#StockBasedCompensationStockOptionActivityDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/StockBasedCompensationTables" xlink:href="enph-20130930.xsd#StockBasedCompensationTables" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/StockBasedCompensationValuationAssumptionsOfStockOptionsUnderBlackScholesModelDetails" xlink:href="enph-20130930.xsd#StockBasedCompensationValuationAssumptionsOfStockOptionsUnderBlackScholesModelDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/WarrantyObligations" xlink:href="enph-20130930.xsd#WarrantyObligations" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/WarrantyObligationsDetails" xlink:href="enph-20130930.xsd#WarrantyObligationsDetails" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/WarrantyObligationsTables" xlink:href="enph-20130930.xsd#WarrantyObligationsTables" xlink:type="simple" />
  <roleRef roleURI="http://enphase.com/role/WarrantyObligationsWarrantyObligationsDetailsTextual" xlink:href="enph-20130930.xsd#WarrantyObligationsWarrantyObligationsDetailsTextual" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <definitionLink xlink:role="http://enphase.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/CondensedConsolidatedBalanceSheetsUnaudited" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_A30AAFC14F12486391FD096ACB7BD09A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_A38489EBF84B1EA91149096ACB7A1F85" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_A30AAFC14F12486391FD096ACB7BD09A" xlink:to="loc_us-gaap_StatementTable_A38489EBF84B1EA91149096ACB7A1F85" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_2CF365AED0F9C9276614096ACB7B7D06" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_A38489EBF84B1EA91149096ACB7A1F85" xlink:to="loc_us-gaap_StatementScenarioAxis_2CF365AED0F9C9276614096ACB7B7D06" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_9E1C466702D2DF3B3C78096ACB7B67D4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_2CF365AED0F9C9276614096ACB7B7D06" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_9E1C466702D2DF3B3C78096ACB7B67D4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_9E1C466702D2DF3B3C78096ACB7B67D4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_2CF365AED0F9C9276614096ACB7B7D06" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_9E1C466702D2DF3B3C78096ACB7B67D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_3E57C7FA34CA1ECD8F88096ACB7B6547" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A30AAFC14F12486391FD096ACB7BD09A" xlink:to="loc_us-gaap_AssetsAbstract_3E57C7FA34CA1ECD8F88096ACB7B6547" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_845B077B6952667AE3B1096ACB7B2E16" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_3E57C7FA34CA1ECD8F88096ACB7B6547" xlink:to="loc_us-gaap_AssetsCurrentAbstract_845B077B6952667AE3B1096ACB7B2E16" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_DEE97DCECE0E5AD4226A096ACB7B3808" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_845B077B6952667AE3B1096ACB7B2E16" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_DEE97DCECE0E5AD4226A096ACB7B3808" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_39226CD5886A935CA586096ACB7BD74E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_845B077B6952667AE3B1096ACB7B2E16" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_39226CD5886A935CA586096ACB7BD74E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_4B650750E02D56B10108096ACB7B4550" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_845B077B6952667AE3B1096ACB7B2E16" xlink:to="loc_us-gaap_InventoryNet_4B650750E02D56B10108096ACB7B4550" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C41FFD31F470B07CDBB9096ACB7B3EB3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_845B077B6952667AE3B1096ACB7B2E16" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C41FFD31F470B07CDBB9096ACB7B3EB3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_DF3CCC029878764E8597096ACB7BC28A" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_845B077B6952667AE3B1096ACB7B2E16" xlink:to="loc_us-gaap_AssetsCurrent_DF3CCC029878764E8597096ACB7BC28A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_A1BB7E8D7214B7A060CD096ACB7B17E1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_3E57C7FA34CA1ECD8F88096ACB7B6547" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_A1BB7E8D7214B7A060CD096ACB7B17E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_FD2843EA9FCA1474B641096ACB7B2F56" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_3E57C7FA34CA1ECD8F88096ACB7B6547" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_FD2843EA9FCA1474B641096ACB7B2F56" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_7CD3FAFEAE3513FC04A4096ACB7BAE1C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_3E57C7FA34CA1ECD8F88096ACB7B6547" xlink:to="loc_us-gaap_Assets_7CD3FAFEAE3513FC04A4096ACB7BAE1C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_CC2B169CDEEA60EADC93096ACB7B0586" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A30AAFC14F12486391FD096ACB7BD09A" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_CC2B169CDEEA60EADC93096ACB7B0586" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_94EA294345227133CA8E096ACB7B7129" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_CC2B169CDEEA60EADC93096ACB7B0586" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_94EA294345227133CA8E096ACB7B7129" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_EFE64C166EACE8645050096ACB7CDC35" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_94EA294345227133CA8E096ACB7B7129" xlink:to="loc_us-gaap_AccountsPayableCurrent_EFE64C166EACE8645050096ACB7CDC35" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_700F20921007ECCCFABC096ACB7C8E1D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_94EA294345227133CA8E096ACB7B7129" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_700F20921007ECCCFABC096ACB7C8E1D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_DDA6794251EB9F518332096ACB7CCAC6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_94EA294345227133CA8E096ACB7B7129" xlink:to="loc_us-gaap_DeferredRevenueCurrent_DDA6794251EB9F518332096ACB7CCAC6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LoansPayableCurrent" xlink:label="loc_us-gaap_LoansPayableCurrent_D037CCAC91F2EF0C6010096ACB7C710D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_94EA294345227133CA8E096ACB7B7129" xlink:to="loc_us-gaap_LoansPayableCurrent_D037CCAC91F2EF0C6010096ACB7C710D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_5993B3AC401D41A0C9D3096ACB7CB5EA" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_94EA294345227133CA8E096ACB7B7129" xlink:to="loc_us-gaap_LiabilitiesCurrent_5993B3AC401D41A0C9D3096ACB7CB5EA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_D9C714D4C4832AEBCF99096ACB7C2144" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_CC2B169CDEEA60EADC93096ACB7B0586" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_D9C714D4C4832AEBCF99096ACB7C2144" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="loc_us-gaap_DeferredRevenueNoncurrent_F29016DA77B235EDFD8E096ACB7C992B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D9C714D4C4832AEBCF99096ACB7C2144" xlink:to="loc_us-gaap_DeferredRevenueNoncurrent_F29016DA77B235EDFD8E096ACB7C992B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualNoncurrent" xlink:label="loc_us-gaap_ProductWarrantyAccrualNoncurrent_D0B87B20639759F24FA6096ACB7C5606" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D9C714D4C4832AEBCF99096ACB7C2144" xlink:to="loc_us-gaap_ProductWarrantyAccrualNoncurrent_D0B87B20639759F24FA6096ACB7C5606" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_2EA727D63416F463146F096ACB7C2A83" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D9C714D4C4832AEBCF99096ACB7C2144" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_2EA727D63416F463146F096ACB7C2A83" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermLoansPayable" xlink:label="loc_us-gaap_LongTermLoansPayable_A46E36DAE7B1F6B48F14096ACB7CB456" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D9C714D4C4832AEBCF99096ACB7C2144" xlink:to="loc_us-gaap_LongTermLoansPayable_A46E36DAE7B1F6B48F14096ACB7CB456" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_DE588AD43AF59A2C5AD9096ACB7C484A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_CC2B169CDEEA60EADC93096ACB7B0586" xlink:to="loc_us-gaap_Liabilities_DE588AD43AF59A2C5AD9096ACB7C484A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_B82055DB6163C74ADEFF096ACB7C5BB9" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_CC2B169CDEEA60EADC93096ACB7B0586" xlink:to="loc_us-gaap_CommitmentsAndContingencies_B82055DB6163C74ADEFF096ACB7C5BB9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_6AED45865C3D2938BB4F096ACB7C9894" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_CC2B169CDEEA60EADC93096ACB7B0586" xlink:to="loc_us-gaap_StockholdersEquityAbstract_6AED45865C3D2938BB4F096ACB7C9894" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_C79876879834328510B8096ACB7C0CE1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AED45865C3D2938BB4F096ACB7C9894" xlink:to="loc_us-gaap_PreferredStockValue_C79876879834328510B8096ACB7C0CE1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_6E866BB704FAF12F9498096ACB7D6F13" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AED45865C3D2938BB4F096ACB7C9894" xlink:to="loc_us-gaap_CommonStockValue_6E866BB704FAF12F9498096ACB7D6F13" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_10656CE5F2A130DB0390096ACB7D0E80" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AED45865C3D2938BB4F096ACB7C9894" xlink:to="loc_us-gaap_AdditionalPaidInCapital_10656CE5F2A130DB0390096ACB7D0E80" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_C7E8FAA64DBF26FB256A096ACB7D824B" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AED45865C3D2938BB4F096ACB7C9894" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_C7E8FAA64DBF26FB256A096ACB7D824B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_D6907F3A0B45F22501CA096ACB7D4613" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AED45865C3D2938BB4F096ACB7C9894" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_D6907F3A0B45F22501CA096ACB7D4613" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_E4A7294FF351FE03C9B2096ACB7D6673" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6AED45865C3D2938BB4F096ACB7C9894" xlink:to="loc_us-gaap_StockholdersEquity_E4A7294FF351FE03C9B2096ACB7D6673" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_E39B8EA82754129B84CC096ACB7D90FC" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_CC2B169CDEEA60EADC93096ACB7B0586" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_E39B8EA82754129B84CC096ACB7D90FC" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_79B27E3ED8402B65E612096ACB746C97" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_StatementTable_79B27E3ED8402B65E612096ACB746C97" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_E5BBAA6D54A6DA32D95A096ACB74070F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_79B27E3ED8402B65E612096ACB746C97" xlink:to="loc_us-gaap_StatementScenarioAxis_E5BBAA6D54A6DA32D95A096ACB74070F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_DF7547AE3929BA3F5589096ACB744425_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_E5BBAA6D54A6DA32D95A096ACB74070F" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_DF7547AE3929BA3F5589096ACB744425_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_DF7547AE3929BA3F5589096ACB744425" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_E5BBAA6D54A6DA32D95A096ACB74070F" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_DF7547AE3929BA3F5589096ACB744425" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_490E19DEE9AAFD16F85D096ACB7485EB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_490E19DEE9AAFD16F85D096ACB7485EB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_CD4AC4388DA4D2777AE1096ACB752C21" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_CD4AC4388DA4D2777AE1096ACB752C21" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_56F672968B4507A60651096ACB7538E0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_56F672968B4507A60651096ACB7538E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_97177931798A204FE5BF096ACB75E80B" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_CommonStockSharesIssued_97177931798A204FE5BF096ACB75E80B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_F68C22F6F903E738D2AC096ACB75D784" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_F68C22F6F903E738D2AC096ACB75D784" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_5929452A0F6F3E3BAE3D096ACB751018" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_5929452A0F6F3E3BAE3D096ACB751018" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_8FE17D0D8161E1556C07096ACB756D63" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_8FE17D0D8161E1556C07096ACB756D63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_25C855F53A3D5AEC07EA096ACB7518F3" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_PreferredStockSharesIssued_25C855F53A3D5AEC07EA096ACB7518F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_F948D6C28A893ACD43BE096ACB75BFFF" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2AD9C343AF2E8ED1A70E096ACB746841" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_F948D6C28A893ACD43BE096ACB75BFFF" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_537B9F4B3F58B9B3832B096ACB63F685" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:to="loc_us-gaap_StatementTable_537B9F4B3F58B9B3832B096ACB63F685" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_2433A7373C8DF4FC9375096ACB63E5D3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_537B9F4B3F58B9B3832B096ACB63F685" xlink:to="loc_us-gaap_StatementScenarioAxis_2433A7373C8DF4FC9375096ACB63E5D3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_030FE7A28706E05BA860096ACB63DD3A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_2433A7373C8DF4FC9375096ACB63E5D3" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_030FE7A28706E05BA860096ACB63DD3A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_030FE7A28706E05BA860096ACB63DD3A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_2433A7373C8DF4FC9375096ACB63E5D3" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_030FE7A28706E05BA860096ACB63DD3A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A1DDC0AE119A869253AD096ACB63E95E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A1DDC0AE119A869253AD096ACB63E95E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_D2B4E2031E58970FD46C096ACB63601F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A1DDC0AE119A869253AD096ACB63E95E" xlink:to="loc_us-gaap_NetIncomeLoss_D2B4E2031E58970FD46C096ACB63601F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C408D95E13973A5F7FA3096ACB63FA1B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A1DDC0AE119A869253AD096ACB63E95E" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C408D95E13973A5F7FA3096ACB63FA1B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_AC3EB1403F3294C681CF096ACB63E762" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C408D95E13973A5F7FA3096ACB63FA1B" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_AC3EB1403F3294C681CF096ACB63E762" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_50422E44471809DB250F096ACB646AAC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C408D95E13973A5F7FA3096ACB63FA1B" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_50422E44471809DB250F096ACB646AAC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnSaleOfOtherAssets" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherAssets_CFB7DB4597E6B749977C096ACB642F2B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C408D95E13973A5F7FA3096ACB63FA1B" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherAssets_CFB7DB4597E6B749977C096ACB642F2B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_A2214F63942B227C4D69096ACB64367E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C408D95E13973A5F7FA3096ACB63FA1B" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_A2214F63942B227C4D69096ACB64367E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_8B6488845B3A7CB6BD3F096ACB64D049" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C408D95E13973A5F7FA3096ACB63FA1B" xlink:to="loc_us-gaap_ShareBasedCompensation_8B6488845B3A7CB6BD3F096ACB64D049" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrealizedGainLossOnDerivatives" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_EA4D025451606B4B644C096ACB6472B0" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C408D95E13973A5F7FA3096ACB63FA1B" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_EA4D025451606B4B644C096ACB6472B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingAssetsAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_24E09437C3D98B4647E2096ACB64FC92" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C408D95E13973A5F7FA3096ACB63FA1B" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_24E09437C3D98B4647E2096ACB64FC92" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_E3C2087A690C44C43915096ACB64493C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_24E09437C3D98B4647E2096ACB64FC92" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_E3C2087A690C44C43915096ACB64493C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_A77C82D6A6749179EBC0096ACB64DBA6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_24E09437C3D98B4647E2096ACB64FC92" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_A77C82D6A6749179EBC0096ACB64DBA6" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_IncreaseDecreaseinAdvancePaymentstoSuppliers" xlink:label="loc_enph_IncreaseDecreaseinAdvancePaymentstoSuppliers_B4A5F79A7A584183A49B0979EB412F05" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_24E09437C3D98B4647E2096ACB64FC92" xlink:to="loc_enph_IncreaseDecreaseinAdvancePaymentstoSuppliers_B4A5F79A7A584183A49B0979EB412F05" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_F6C20E6E7B5C19922D6D096ACB64488E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_24E09437C3D98B4647E2096ACB64FC92" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_F6C20E6E7B5C19922D6D096ACB64488E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_38B332111767B9BC7D0F096ACB646EE4" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_24E09437C3D98B4647E2096ACB64FC92" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_38B332111767B9BC7D0F096ACB646EE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_52BF7421EC14870DBA14096ACB64EBBF" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_24E09437C3D98B4647E2096ACB64FC92" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_52BF7421EC14870DBA14096ACB64EBBF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_5A95DABDA57F30B7BAFB096ACB64C728" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A1DDC0AE119A869253AD096ACB63E95E" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_5A95DABDA57F30B7BAFB096ACB64C728" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_BCBFEF44ADF317319E05096ACB648B8B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_BCBFEF44ADF317319E05096ACB648B8B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_5891D12AB94D885C1F3B096ACB64102E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_BCBFEF44ADF317319E05096ACB648B8B" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_5891D12AB94D885C1F3B096ACB64102E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_34AAA6D4EC7252C2CD4E096ACB658B0D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_BCBFEF44ADF317319E05096ACB648B8B" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_34AAA6D4EC7252C2CD4E096ACB658B0D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8605515F9C6D4B59FAEE096ACB655F7C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8605515F9C6D4B59FAEE096ACB655F7C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_78A8AEA35D5D13391376096ACB65D6D0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8605515F9C6D4B59FAEE096ACB655F7C" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_78A8AEA35D5D13391376096ACB65D6D0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_F9FE20F24C7024B9B25A096ACB65C9B2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8605515F9C6D4B59FAEE096ACB655F7C" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_F9FE20F24C7024B9B25A096ACB65C9B2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RepaymentsOfLongTermCapitalLeaseObligations" xlink:label="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_4415A328B1F0E4A100B0096ACB650D0F" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8605515F9C6D4B59FAEE096ACB655F7C" xlink:to="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_4415A328B1F0E4A100B0096ACB650D0F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_732588053695E83DD93C096ACB6572D9" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8605515F9C6D4B59FAEE096ACB655F7C" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_732588053695E83DD93C096ACB6572D9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:label="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_DAD7202E4517D97DD4EF096ACB6520D7" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8605515F9C6D4B59FAEE096ACB655F7C" xlink:to="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_DAD7202E4517D97DD4EF096ACB6520D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsOfStockIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_FE3DD6C398E4A68C73D1096ACB65CD60" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8605515F9C6D4B59FAEE096ACB655F7C" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_FE3DD6C398E4A68C73D1096ACB65CD60" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_72970222DD83C393C36F096ACB65BB7A" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8605515F9C6D4B59FAEE096ACB655F7C" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_72970222DD83C393C36F096ACB65BB7A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_45692E96E2DE0A75CB4B096ACB65E00E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_45692E96E2DE0A75CB4B096ACB65E00E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_00AA34E981B10F35FE17096ACB65C0D2" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_00AA34E981B10F35FE17096ACB65C0D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_4D2426ED4026573BD66D096ACB6517C7" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_4D2426ED4026573BD66D096ACB6517C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_E93F25CE8C774F6F8234096ACB669C61" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_E93F25CE8C774F6F8234096ACB669C61" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestPaid" xlink:label="loc_us-gaap_InterestPaid_45DA879FE56B75A73A70096ACB662C87" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_E93F25CE8C774F6F8234096ACB669C61" xlink:to="loc_us-gaap_InterestPaid_45DA879FE56B75A73A70096ACB662C87" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncashInvestingAndFinancingItemsAbstract" xlink:label="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_6CC73BF3E52D22D33C2F096ACB669892" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E9BFA789AB9656E41D99096ACB63283D" xlink:to="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_6CC73BF3E52D22D33C2F096ACB669892" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_7963FD0057F75CDC0EB9096ACB6606CE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_6CC73BF3E52D22D33C2F096ACB669892" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_7963FD0057F75CDC0EB9096ACB6606CE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_3F58AC07A56607374E13096ACB667EF2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_6CC73BF3E52D22D33C2F096ACB669892" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_3F58AC07A56607374E13096ACB667EF2" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_ReclassificationofPreferredStockWarrantLiability" xlink:label="loc_enph_ReclassificationofPreferredStockWarrantLiability_6573E8DF3E972CB34E13096ACB662BC6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_6CC73BF3E52D22D33C2F096ACB669892" xlink:to="loc_enph_ReclassificationofPreferredStockWarrantLiability_6573E8DF3E972CB34E13096ACB662BC6" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/CondensedConsolidatedStatementsOfComprehensiveLossUnaudited" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_512525048C3130639BFEBBCE85A408A5" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_4C548BB988B01A033087BBCE85A32034" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_512525048C3130639BFEBBCE85A408A5" xlink:to="loc_us-gaap_StatementTable_4C548BB988B01A033087BBCE85A32034" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_D630FC86295CB42E3AEDBBCE85A3854B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4C548BB988B01A033087BBCE85A32034" xlink:to="loc_us-gaap_StatementScenarioAxis_D630FC86295CB42E3AEDBBCE85A3854B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_994C4122E5A6785F727DBBCE85A46B83_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_D630FC86295CB42E3AEDBBCE85A3854B" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_994C4122E5A6785F727DBBCE85A46B83_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_994C4122E5A6785F727DBBCE85A46B83" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_D630FC86295CB42E3AEDBBCE85A3854B" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_994C4122E5A6785F727DBBCE85A46B83" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_33C64BE34A4DB78E33DDBBCE85A4B7AA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_512525048C3130639BFEBBCE85A408A5" xlink:to="loc_us-gaap_NetIncomeLoss_33C64BE34A4DB78E33DDBBCE85A4B7AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_5FB15E241B54135D42DFBBCE85A47285" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_512525048C3130639BFEBBCE85A408A5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_5FB15E241B54135D42DFBBCE85A47285" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_6464102272022FF92ED8BBCE85A4D050" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_5FB15E241B54135D42DFBBCE85A47285" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_6464102272022FF92ED8BBCE85A4D050" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_431DC63219BC44B8D028BBCE85A442E0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_512525048C3130639BFEBBCE85A408A5" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_431DC63219BC44B8D028BBCE85A442E0" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/CondensedConsolidatedStatementsOfOperationsUnaudited" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_A3E34962F94D77E074BDBBCE85FA3219" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_StatementTable_A3E34962F94D77E074BDBBCE85FA3219" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_339849FE60A8DBFAD49BBBCE85FA5659" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_A3E34962F94D77E074BDBBCE85FA3219" xlink:to="loc_us-gaap_StatementScenarioAxis_339849FE60A8DBFAD49BBBCE85FA5659" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_72B34C988332654D6D48BBCE85FA2489_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_339849FE60A8DBFAD49BBBCE85FA5659" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_72B34C988332654D6D48BBCE85FA2489_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_72B34C988332654D6D48BBCE85FA2489" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_339849FE60A8DBFAD49BBBCE85FA5659" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_72B34C988332654D6D48BBCE85FA2489" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaap_SalesRevenueNet_F38E26D9A3DBDC094D21BBCE85FA560C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_SalesRevenueNet_F38E26D9A3DBDC094D21BBCE85FA560C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_BFE0C553206E874CC7F1BBCE85FB817A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_CostOfRevenue_BFE0C553206E874CC7F1BBCE85FB817A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_FBCFC1B2E92A7495281EBBCE85FB6E83" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_GrossProfit_FBCFC1B2E92A7495281EBBCE85FB6E83" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_43B2A6D988F4EE5E35FBBBCE85FBD487" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_OperatingExpensesAbstract_43B2A6D988F4EE5E35FBBBCE85FBD487" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_973266544967DDBDAFC3BBCE85FBDD83" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_43B2A6D988F4EE5E35FBBBCE85FBD487" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_973266544967DDBDAFC3BBCE85FBDD83" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaap_SellingAndMarketingExpense_89AA3275A0FC4623A3EFBBCE85FBA848" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_43B2A6D988F4EE5E35FBBBCE85FBD487" xlink:to="loc_us-gaap_SellingAndMarketingExpense_89AA3275A0FC4623A3EFBBCE85FBA848" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_B8BF3700F3C20458C47EBBCE85FC41DE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_43B2A6D988F4EE5E35FBBBCE85FBD487" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_B8BF3700F3C20458C47EBBCE85FC41DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_316C8422D3054A21E274BBCE85FC4DD3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_43B2A6D988F4EE5E35FBBBCE85FBD487" xlink:to="loc_us-gaap_OperatingExpenses_316C8422D3054A21E274BBCE85FC4DD3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_1E4BF74C6C07B05BC983BBCE85FCA31E" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_1E4BF74C6C07B05BC983BBCE85FCA31E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_8F88CF8D186A5D6AD73DBBCE85FC8B2C" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_8F88CF8D186A5D6AD73DBBCE85FC8B2C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_18C2DE9FF7ABE9B3EFA5BBCE85FC7A64" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_8F88CF8D186A5D6AD73DBBCE85FC8B2C" xlink:to="loc_us-gaap_InterestExpense_18C2DE9FF7ABE9B3EFA5BBCE85FC7A64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_211CEB68CC96BF7F1D96BBCE85FC2F0E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_8F88CF8D186A5D6AD73DBBCE85FC8B2C" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_211CEB68CC96BF7F1D96BBCE85FC2F0E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_6B7C84B821B68823AA49BBCE85FC5A25" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_8F88CF8D186A5D6AD73DBBCE85FC8B2C" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_6B7C84B821B68823AA49BBCE85FC5A25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_398C3DFF835617342DEBBBCE85FC6695" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_398C3DFF835617342DEBBBCE85FC6695" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_57C7F0A62FD60C85A31BBBCE85FD248C" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_57C7F0A62FD60C85A31BBBCE85FD248C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_E7CD21C9B5838E92903FBBCE85FDFB91" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_NetIncomeLoss_E7CD21C9B5838E92903FBBCE85FDFB91" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare_6538C8AC3CE21CA99DFBBBCE85FDBBCE" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare_6538C8AC3CE21CA99DFBBBCE85FDBBCE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_C225D9E6A99A05F20003BBCE85FD25AF" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DEF2ACFEABEC1E6A126EBBCE85FA9AA9" xlink:to="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_C225D9E6A99A05F20003BBCE85FD25AF" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/FairValueMeasurements" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_8256B5E9A8EB8EA47FA2BBCE85EADABF" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_77CFAEA785360F6AC4B1BBCE85EA53C2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_8256B5E9A8EB8EA47FA2BBCE85EADABF" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_77CFAEA785360F6AC4B1BBCE85EA53C2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2779058C571524D7ACE8BBCE85EA78FA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_77CFAEA785360F6AC4B1BBCE85EA53C2" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2779058C571524D7ACE8BBCE85EA78FA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_2A51ACC82062343DD101BBCE85EA2B30_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2779058C571524D7ACE8BBCE85EA78FA" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_2A51ACC82062343DD101BBCE85EA2B30_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_2A51ACC82062343DD101BBCE85EA2B30" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2779058C571524D7ACE8BBCE85EA78FA" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_2A51ACC82062343DD101BBCE85EA2B30" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_E17577BA6FC29517B178BBCE85EAF39B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_2A51ACC82062343DD101BBCE85EA2B30" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_E17577BA6FC29517B178BBCE85EAF39B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_598AE1A283933CD265F5BBCE85EAED40" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_77CFAEA785360F6AC4B1BBCE85EA53C2" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_598AE1A283933CD265F5BBCE85EAED40" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_333D42ED87A1740A75F5BBCE85EA9560_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_598AE1A283933CD265F5BBCE85EAED40" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_333D42ED87A1740A75F5BBCE85EA9560_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_333D42ED87A1740A75F5BBCE85EA9560" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_598AE1A283933CD265F5BBCE85EAED40" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_333D42ED87A1740A75F5BBCE85EA9560" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_ABF045457D1A96CCC6CABBCE85EA7C98" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_333D42ED87A1740A75F5BBCE85EA9560" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_ABF045457D1A96CCC6CABBCE85EA7C98" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_F31F62B03219DCB125F7BBCE85EBA326" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_8256B5E9A8EB8EA47FA2BBCE85EADABF" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_F31F62B03219DCB125F7BBCE85EBA326" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_22584F26C6426C0B8B46BBCE85EB6774" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_F31F62B03219DCB125F7BBCE85EBA326" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_22584F26C6426C0B8B46BBCE85EB6774" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_A403925314A32993FADDBBCE85EB8E29" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_8256B5E9A8EB8EA47FA2BBCE85EADABF" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_A403925314A32993FADDBBCE85EB8E29" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_ED7914390D70A99CA196BBCE85EBF68D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_A403925314A32993FADDBBCE85EB8E29" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_ED7914390D70A99CA196BBCE85EBF68D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/FairValueMeasurementsDetailsTextual" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_CDBDA83863C53FDDDBFC10508370825C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_99360A616F1751BD19D2105083706203" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_CDBDA83863C53FDDDBFC10508370825C" xlink:to="loc_us-gaap_DerivativeTable_99360A616F1751BD19D2105083706203" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_BF3113A7BA5F4D70E494105083706091" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_99360A616F1751BD19D2105083706203" xlink:to="loc_us-gaap_HedgingDesignationAxis_BF3113A7BA5F4D70E494105083706091" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_8D18E3A29E537D246ACC10508370D6C2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_BF3113A7BA5F4D70E494105083706091" xlink:to="loc_us-gaap_HedgingDesignationDomain_8D18E3A29E537D246ACC10508370D6C2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_8D18E3A29E537D246ACC10508370D6C2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_BF3113A7BA5F4D70E494105083706091" xlink:to="loc_us-gaap_HedgingDesignationDomain_8D18E3A29E537D246ACC10508370D6C2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_7FE5B45915BD4408DDAA105083706584" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_8D18E3A29E537D246ACC10508370D6C2" xlink:to="loc_us-gaap_NondesignatedMember_7FE5B45915BD4408DDAA105083706584" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_C200711EC12CE012808E105083706D83" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_99360A616F1751BD19D2105083706203" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_C200711EC12CE012808E105083706D83" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_D6A8361446947611608D10508370A6B4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_C200711EC12CE012808E105083706D83" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_D6A8361446947611608D10508370A6B4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_D6A8361446947611608D10508370A6B4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_C200711EC12CE012808E105083706D83" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_D6A8361446947611608D10508370A6B4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignExchangeForwardMember" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_4A310CC34F0746B88236105083703B50" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_D6A8361446947611608D10508370A6B4" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_4A310CC34F0746B88236105083703B50" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_DerivativeNotionalAmount" xlink:label="loc_invest_DerivativeNotionalAmount_81EA433F7C03022B564910508370D3D4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_CDBDA83863C53FDDDBFC10508370825C" xlink:to="loc_invest_DerivativeNotionalAmount_81EA433F7C03022B564910508370D3D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments" xlink:label="loc_us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments_37A8ABA7C7FABF08A99510508370430D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_CDBDA83863C53FDDDBFC10508370825C" xlink:to="loc_us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments_37A8ABA7C7FABF08A99510508370430D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/IncomeTaxes" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/IncomeTaxesDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/Inventory" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/InventoryDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/InventoryTables" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/LongTermDebt" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/LongTermDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_06C0B42CF382AEE0320BBBCE85E34EA2" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_E493ABCD745FE8E126D5BBCE85E3965C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_06C0B42CF382AEE0320BBBCE85E34EA2" xlink:to="loc_us-gaap_DebtInstrumentTable_E493ABCD745FE8E126D5BBCE85E3965C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_B5740DD1689F9198D42EBBCE85E3FA82" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_E493ABCD745FE8E126D5BBCE85E3965C" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_B5740DD1689F9198D42EBBCE85E3FA82" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_A19181F96A43BEC8B167BBCE85E35666_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_B5740DD1689F9198D42EBBCE85E3FA82" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_A19181F96A43BEC8B167BBCE85E35666_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_A19181F96A43BEC8B167BBCE85E35666" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_B5740DD1689F9198D42EBBCE85E3FA82" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_A19181F96A43BEC8B167BBCE85E35666" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="loc_us-gaap_SecuredDebtMember_5DAAEA893CCED19F43FFBBCE85E322CC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_A19181F96A43BEC8B167BBCE85E35666" xlink:to="loc_us-gaap_SecuredDebtMember_5DAAEA893CCED19F43FFBBCE85E322CC" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_EquipmentFinancingFacilityMember" xlink:label="loc_enph_EquipmentFinancingFacilityMember_65C5583B72B4C909FEFBBBCE85E34A3A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_A19181F96A43BEC8B167BBCE85E35666" xlink:to="loc_enph_EquipmentFinancingFacilityMember_65C5583B72B4C909FEFBBBCE85E34A3A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtCurrentAndNoncurrentAbstract" xlink:label="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_33B98D0598FEA47AF93ABBCE85E35AAA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_06C0B42CF382AEE0320BBBCE85E34EA2" xlink:to="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_33B98D0598FEA47AF93ABBCE85E35AAA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_547A768D663BB54DA802BBCE85E3E05D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_33B98D0598FEA47AF93ABBCE85E35AAA" xlink:to="loc_us-gaap_LongTermDebt_547A768D663BB54DA802BBCE85E3E05D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_F2EA2BF0E0158B3B2157BBCE85E32A3F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_33B98D0598FEA47AF93ABBCE85E35AAA" xlink:to="loc_us-gaap_LongTermDebtCurrent_F2EA2BF0E0158B3B2157BBCE85E32A3F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_1315206A88869AFDB2ADBBCE85E333A4" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_33B98D0598FEA47AF93ABBCE85E35AAA" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_1315206A88869AFDB2ADBBCE85E333A4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_195824330D416F2922D6BBCE85E41BCA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_06C0B42CF382AEE0320BBBCE85E34EA2" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_195824330D416F2922D6BBCE85E41BCA" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/LongTermDebtDetailsTextual" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_05F889D576297CB5E410BBCE858FCF4E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_BE1C139CF2B468618817BBCE858ECB9E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_05F889D576297CB5E410BBCE858FCF4E" xlink:to="loc_us-gaap_DebtInstrumentTable_BE1C139CF2B468618817BBCE858ECB9E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_98FBA4E606DF586FC029BBCE858E16E8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_BE1C139CF2B468618817BBCE858ECB9E" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_98FBA4E606DF586FC029BBCE858E16E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_368E233DE0644565C448BBCE858EE427_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_98FBA4E606DF586FC029BBCE858E16E8" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_368E233DE0644565C448BBCE858EE427_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_368E233DE0644565C448BBCE858EE427" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_98FBA4E606DF586FC029BBCE858E16E8" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_368E233DE0644565C448BBCE858EE427" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_WellsFargoBankMember" xlink:label="loc_enph_WellsFargoBankMember_C5C2D9C804B24DB331E1BBCE858E7B04" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_368E233DE0644565C448BBCE858EE427" xlink:to="loc_enph_WellsFargoBankMember_C5C2D9C804B24DB331E1BBCE858E7B04" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_HerculesTechnologyGrowthCapitalIncMember" xlink:label="loc_enph_HerculesTechnologyGrowthCapitalIncMember_9D363923F55DB9E3E7A9BBCE858E4F11" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_368E233DE0644565C448BBCE858EE427" xlink:to="loc_enph_HerculesTechnologyGrowthCapitalIncMember_9D363923F55DB9E3E7A9BBCE858E4F11" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_83C0A958497439F74F17BBCE858E4942" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_BE1C139CF2B468618817BBCE858ECB9E" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_83C0A958497439F74F17BBCE858E4942" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_35EEE28053390DE137B5BBCE858E2B99_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_83C0A958497439F74F17BBCE858E4942" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_35EEE28053390DE137B5BBCE858E2B99_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_35EEE28053390DE137B5BBCE858E2B99" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_83C0A958497439F74F17BBCE858E4942" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_35EEE28053390DE137B5BBCE858E2B99" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_7DE477420D87ECDA9DA4BBCE858E8B89" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_35EEE28053390DE137B5BBCE858E2B99" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_7DE477420D87ECDA9DA4BBCE858E8B89" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="loc_us-gaap_SecuredDebtMember_C59ADBEAC13BB11070BBBBCE858F53EC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_35EEE28053390DE137B5BBCE858E2B99" xlink:to="loc_us-gaap_SecuredDebtMember_C59ADBEAC13BB11070BBBBCE858F53EC" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_EquipmentFinancingFacilityMember" xlink:label="loc_enph_EquipmentFinancingFacilityMember_F0DA815BF95FE7D0B737BBCE858F80CA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_35EEE28053390DE137B5BBCE858E2B99" xlink:to="loc_enph_EquipmentFinancingFacilityMember_F0DA815BF95FE7D0B737BBCE858F80CA" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_LineOfCreditNumberOfDebtAgreements" xlink:label="loc_enph_LineOfCreditNumberOfDebtAgreements_3D32ACE580E6662C5CAEBBCE858F2935" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_05F889D576297CB5E410BBCE858FCF4E" xlink:to="loc_enph_LineOfCreditNumberOfDebtAgreements_3D32ACE580E6662C5CAEBBCE858F2935" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_C6C018CCA0CAB1E29578BBCE858F35F1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_05F889D576297CB5E410BBCE858FCF4E" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_C6C018CCA0CAB1E29578BBCE858F35F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_D47F9C9A2F6065BE5488BBCE858FFDB9" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_05F889D576297CB5E410BBCE858FCF4E" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_D47F9C9A2F6065BE5488BBCE858FFDB9" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/LongTermDebtTables" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/NetLossPerShareAttributableToCommonStockholders" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/NetLossPerShareAttributableToCommonStockholdersDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_E200A717B5C93C46A7ABBBCE8581A55E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C5339CA83F14AE6AA5B7BBCE85809775" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_E200A717B5C93C46A7ABBBCE8581A55E" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C5339CA83F14AE6AA5B7BBCE85809775" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_022351D8A1919CBB89D3BBCE85802F66" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C5339CA83F14AE6AA5B7BBCE85809775" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_022351D8A1919CBB89D3BBCE85802F66" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_CBCA67F4A03986B9D78CBBCE8580B42A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_022351D8A1919CBB89D3BBCE85802F66" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_CBCA67F4A03986B9D78CBBCE8580B42A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_CBCA67F4A03986B9D78CBBCE8580B42A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_022351D8A1919CBB89D3BBCE85802F66" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_CBCA67F4A03986B9D78CBBCE8580B42A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_5D39E186870D3183BB2DBBCE8580C299" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_CBCA67F4A03986B9D78CBBCE8580B42A" xlink:to="loc_us-gaap_EmployeeStockOptionMember_5D39E186870D3183BB2DBBCE8580C299" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_33CBAB3D851EF406AC1BBBCE85819243" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_CBCA67F4A03986B9D78CBBCE8580B42A" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_33CBAB3D851EF406AC1BBBCE85819243" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaap_WarrantMember_79A45636296FFD357266BBCE8581FFC8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_CBCA67F4A03986B9D78CBBCE8580B42A" xlink:to="loc_us-gaap_WarrantMember_79A45636296FFD357266BBCE8581FFC8" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_AntidilutiveSecuritiesAbstract" xlink:label="loc_enph_AntidilutiveSecuritiesAbstract_FC18F36D528D73E19C87BBCE8581A4FE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_E200A717B5C93C46A7ABBBCE8581A55E" xlink:to="loc_enph_AntidilutiveSecuritiesAbstract_FC18F36D528D73E19C87BBCE8581A4FE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_F341FF480C9B8A1D4456BBCE85814347" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_enph_AntidilutiveSecuritiesAbstract_FC18F36D528D73E19C87BBCE8581A4FE" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_F341FF480C9B8A1D4456BBCE85814347" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/NetLossPerShareAttributableToCommonStockholdersDetailsTextual" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/NetLossPerShareAttributableToCommonStockholdersTables" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/OverviewAndSummaryOfAccountingPoliciesDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/OverviewAndSummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/OverviewAndSummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/RelatedPartyTransactions" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_31F7FC0BBD0D97D4381E0BC03BCB613E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_04280369347600CF54C90BC03BCA42A6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_31F7FC0BBD0D97D4381E0BC03BCB613E" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_04280369347600CF54C90BC03BCA42A6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_A8702A3179247E31859C0BC03BCBF041" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_04280369347600CF54C90BC03BCA42A6" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_A8702A3179247E31859C0BC03BCBF041" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_795E4E7B4F7403042BA30BC03BCB09CA_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_A8702A3179247E31859C0BC03BCBF041" xlink:to="loc_us-gaap_RelatedPartyDomain_795E4E7B4F7403042BA30BC03BCB09CA_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_795E4E7B4F7403042BA30BC03BCB09CA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_A8702A3179247E31859C0BC03BCBF041" xlink:to="loc_us-gaap_RelatedPartyDomain_795E4E7B4F7403042BA30BC03BCB09CA" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_KpcbHoldingsIncMember" xlink:label="loc_enph_KpcbHoldingsIncMember_13F1E23E7EEF39D40CDB0BC03BCBB335" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_795E4E7B4F7403042BA30BC03BCB09CA" xlink:to="loc_enph_KpcbHoldingsIncMember_13F1E23E7EEF39D40CDB0BC03BCBB335" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_RelatedPartyOwnershipPercentageOfCompany" xlink:label="loc_enph_RelatedPartyOwnershipPercentageOfCompany_5A57D2BA9C1F254065910BC03BCBC4F4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_31F7FC0BBD0D97D4381E0BC03BCB613E" xlink:to="loc_enph_RelatedPartyOwnershipPercentageOfCompany_5A57D2BA9C1F254065910BC03BCBC4F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevenueFromRelatedParties" xlink:label="loc_us-gaap_RevenueFromRelatedParties_B9BB7094C2DF3446DC6C0BC03BCB5488" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_31F7FC0BBD0D97D4381E0BC03BCB613E" xlink:to="loc_us-gaap_RevenueFromRelatedParties_B9BB7094C2DF3446DC6C0BC03BCB5488" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/StockBasedCompensation" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/StockBasedCompensationComponentsOfStockBasedCompensationExpenseByReportLineDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_990D6E60064EF7E32C4DBBCE85F16C06" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_4FF648C1BA2A20E4DF0BBBCE85F0B024" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_990D6E60064EF7E32C4DBBCE85F16C06" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_4FF648C1BA2A20E4DF0BBBCE85F0B024" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_E65A644B0A74F241F739BBCE85F1C9F8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_4FF648C1BA2A20E4DF0BBBCE85F0B024" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_E65A644B0A74F241F739BBCE85F1C9F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_03EEBD356B4DB7365A65BBCE85F11C17_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_E65A644B0A74F241F739BBCE85F1C9F8" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_03EEBD356B4DB7365A65BBCE85F11C17_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_03EEBD356B4DB7365A65BBCE85F11C17" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_E65A644B0A74F241F739BBCE85F1C9F8" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_03EEBD356B4DB7365A65BBCE85F11C17" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_9E36E505ABBDF4BB1396BBCE85F1E3D9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_03EEBD356B4DB7365A65BBCE85F11C17" xlink:to="loc_us-gaap_CostOfSalesMember_9E36E505ABBDF4BB1396BBCE85F1E3D9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_037B94D3B3FFF36A2ACDBBCE85F1299E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_03EEBD356B4DB7365A65BBCE85F11C17" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_037B94D3B3FFF36A2ACDBBCE85F1299E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_AF2E50D2E6F1D09D500FBBCE85F11823" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_03EEBD356B4DB7365A65BBCE85F11C17" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_AF2E50D2E6F1D09D500FBBCE85F11823" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_36318C3C8BEA9CADF2BDBBCE85F1D583" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_03EEBD356B4DB7365A65BBCE85F11C17" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_36318C3C8BEA9CADF2BDBBCE85F1D583" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract_7A694C2939F28DBA3618BBCE85F153BD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_990D6E60064EF7E32C4DBBCE85F16C06" xlink:to="loc_us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract_7A694C2939F28DBA3618BBCE85F153BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_EA86DBBE354FC7CE8F3ABBCE85F14BC5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract_7A694C2939F28DBA3618BBCE85F153BD" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_EA86DBBE354FC7CE8F3ABBCE85F14BC5" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/StockBasedCompensationDetailsTextual" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_800268578FAA572E0C860B6C42E0511D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9479D72DFC10EECFA7BD0B6C42DFEBD5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_800268578FAA572E0C860B6C42E0511D" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9479D72DFC10EECFA7BD0B6C42DFEBD5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_AC5E7AEECD99D6FD49F70B6C42DF2D5F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9479D72DFC10EECFA7BD0B6C42DFEBD5" xlink:to="loc_us-gaap_AwardTypeAxis_AC5E7AEECD99D6FD49F70B6C42DF2D5F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2B0C77031187FE87DAF20B6C42DF5B26_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_AC5E7AEECD99D6FD49F70B6C42DF2D5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2B0C77031187FE87DAF20B6C42DF5B26_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2B0C77031187FE87DAF20B6C42DF5B26" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_AC5E7AEECD99D6FD49F70B6C42DF2D5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2B0C77031187FE87DAF20B6C42DF5B26" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_B46FDBE580365F3295260B6C42DF3986" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2B0C77031187FE87DAF20B6C42DF5B26" xlink:to="loc_us-gaap_RestrictedStockMember_B46FDBE580365F3295260B6C42DF3986" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExercisedinPeriodFairValue" xlink:label="loc_enph_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExercisedinPeriodFairValue_E7FB9129C1C6ED37296C0B6C42E02194" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_800268578FAA572E0C860B6C42E0511D" xlink:to="loc_enph_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExercisedinPeriodFairValue_E7FB9129C1C6ED37296C0B6C42E02194" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_979127268022F97224710B6C42E0C652" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_800268578FAA572E0C860B6C42E0511D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_979127268022F97224710B6C42E0C652" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_6567B316A6348A7D187F0B6C42E0A8CF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_800268578FAA572E0C860B6C42E0511D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_6567B316A6348A7D187F0B6C42E0A8CF" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedIntrinsicValueValue" xlink:label="loc_enph_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedIntrinsicValueValue_4202A7349FAF3D8A31660B6C42E0183C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_800268578FAA572E0C860B6C42E0511D" xlink:to="loc_enph_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedIntrinsicValueValue_4202A7349FAF3D8A31660B6C42E0183C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_B7D763218A7DD11606B70B6C42E08296" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_800268578FAA572E0C860B6C42E0511D" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_B7D763218A7DD11606B70B6C42E08296" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_9F361D1A66514070A4E30B6C42E0FA60" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_800268578FAA572E0C860B6C42E0511D" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_9F361D1A66514070A4E30B6C42E0FA60" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/StockBasedCompensationExpenseByAwardTypeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_017AD6A9FA38E343032FBBCE858815D2" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ED4476C81B2FEFFB231BBBCE858718AC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_017AD6A9FA38E343032FBBCE858815D2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ED4476C81B2FEFFB231BBBCE858718AC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_2FD0FE8B62FA9FB7CD37BBCE8587870C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ED4476C81B2FEFFB231BBBCE858718AC" xlink:to="loc_us-gaap_AwardTypeAxis_2FD0FE8B62FA9FB7CD37BBCE8587870C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9AECE1F11E8CDE96EB2FBBCE8587882F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_2FD0FE8B62FA9FB7CD37BBCE8587870C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9AECE1F11E8CDE96EB2FBBCE8587882F_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9AECE1F11E8CDE96EB2FBBCE8587882F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_2FD0FE8B62FA9FB7CD37BBCE8587870C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9AECE1F11E8CDE96EB2FBBCE8587882F" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_EmployeeStockOptionsAndRestrictedStockUnitsMember" xlink:label="loc_enph_EmployeeStockOptionsAndRestrictedStockUnitsMember_2BB7442287ED81B8970FBBCE85876672" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9AECE1F11E8CDE96EB2FBBCE8587882F" xlink:to="loc_enph_EmployeeStockOptionsAndRestrictedStockUnitsMember_2BB7442287ED81B8970FBBCE85876672" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_FC7F870D3A1F6315432ABBCE8588BEF5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9AECE1F11E8CDE96EB2FBBCE8587882F" xlink:to="loc_us-gaap_EmployeeStockMember_FC7F870D3A1F6315432ABBCE8588BEF5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_4A98F6D0294FF21EE2C0BBCE8588770C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_017AD6A9FA38E343032FBBCE858815D2" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_4A98F6D0294FF21EE2C0BBCE8588770C" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/StockBasedCompensationRestrictedStockUnitActivityDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B04992B8F665EA92503F1042464B4DEB" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6E552F55C1DAB91980FA1042464BC9AE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B04992B8F665EA92503F1042464B4DEB" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6E552F55C1DAB91980FA1042464BC9AE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_782186B23C1339ED6F3A1042464BB763" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6E552F55C1DAB91980FA1042464BC9AE" xlink:to="loc_us-gaap_AwardTypeAxis_782186B23C1339ED6F3A1042464BB763" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02ED8DA57A138E30868D1042464BD877_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_782186B23C1339ED6F3A1042464BB763" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02ED8DA57A138E30868D1042464BD877_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02ED8DA57A138E30868D1042464BD877" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_782186B23C1339ED6F3A1042464BB763" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02ED8DA57A138E30868D1042464BD877" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_88EF9E36C93828CF731D1042464B35E3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02ED8DA57A138E30868D1042464BD877" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_88EF9E36C93828CF731D1042464B35E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_B0B02FF2E68E1ACC0E761042464B4D4B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B04992B8F665EA92503F1042464B4DEB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_B0B02FF2E68E1ACC0E761042464B4D4B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_17434EA1753415AC485A1042464B6902" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_B0B02FF2E68E1ACC0E761042464B4D4B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_17434EA1753415AC485A1042464B6902" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_CE7F4AA2A589AD684DEB1042464B9E51" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_B0B02FF2E68E1ACC0E761042464B4D4B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_CE7F4AA2A589AD684DEB1042464B9E51" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6C2CB389AEC8F58E44871042464CA346" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_B0B02FF2E68E1ACC0E761042464B4D4B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6C2CB389AEC8F58E44871042464CA346" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_21D9538479D45B50C2AB1042464C7E1C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_B0B02FF2E68E1ACC0E761042464B4D4B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_21D9538479D45B50C2AB1042464C7E1C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7B9CB07C7689FB0BC7BC1042464CC57D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B04992B8F665EA92503F1042464B4DEB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7B9CB07C7689FB0BC7BC1042464CC57D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_ED1D7D29D7FA77DA0A151042464CFE58" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7B9CB07C7689FB0BC7BC1042464CC57D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_ED1D7D29D7FA77DA0A151042464CFE58" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C51604A38031112F685A1042464C83EC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7B9CB07C7689FB0BC7BC1042464CC57D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C51604A38031112F685A1042464C83EC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_EE50F6BC98A03C09797C1042464C78CF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7B9CB07C7689FB0BC7BC1042464CC57D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_EE50F6BC98A03C09797C1042464C78CF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_89EDFAFE96856414096F1042464C12A2" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7B9CB07C7689FB0BC7BC1042464CC57D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_89EDFAFE96856414096F1042464C12A2" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/StockBasedCompensationStockOptionActivityDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/StockBasedCompensationTables" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/StockBasedCompensationValuationAssumptionsOfStockOptionsUnderBlackScholesModelDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C5F8B64C8AD7E48BAAE0BBCE857C9F70" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9BF2626D516C6EAB56E5BBCE857C39A2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C5F8B64C8AD7E48BAAE0BBCE857C9F70" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9BF2626D516C6EAB56E5BBCE857C39A2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_4CAD5DA857520412E834BBCE857C0011" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9BF2626D516C6EAB56E5BBCE857C39A2" xlink:to="loc_us-gaap_AwardTypeAxis_4CAD5DA857520412E834BBCE857C0011" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89FA4B02E34404AE33E8BBCE857CD589_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_4CAD5DA857520412E834BBCE857C0011" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89FA4B02E34404AE33E8BBCE857CD589_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89FA4B02E34404AE33E8BBCE857CD589" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_4CAD5DA857520412E834BBCE857C0011" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89FA4B02E34404AE33E8BBCE857CD589" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_26065EDA93350C50BD0ABBCE857CB862" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89FA4B02E34404AE33E8BBCE857CD589" xlink:to="loc_us-gaap_EmployeeStockOptionMember_26065EDA93350C50BD0ABBCE857CB862" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_0FE9A9E585F672B34121BBCE857C68BB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C5F8B64C8AD7E48BAAE0BBCE857C9F70" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_0FE9A9E585F672B34121BBCE857C68BB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_6CC34D2F4808F2632018BBCE857CD004" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_0FE9A9E585F672B34121BBCE857C68BB" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_6CC34D2F4808F2632018BBCE857CD004" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_2192E9CB61661205D80ABBCE857C20F4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_0FE9A9E585F672B34121BBCE857C68BB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_2192E9CB61661205D80ABBCE857C20F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_AD551B5987014E75B663BBCE857D4BB7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_0FE9A9E585F672B34121BBCE857C68BB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_AD551B5987014E75B663BBCE857D4BB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_11AA02EC410AD15CDD2DBBCE857D4DBB" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_0FE9A9E585F672B34121BBCE857C68BB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_11AA02EC410AD15CDD2DBBCE857D4DBB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_A6B4503660B108185788BBCE857D4695" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_0FE9A9E585F672B34121BBCE857C68BB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_A6B4503660B108185788BBCE857D4695" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://enphase.com/role/WarrantyObligations" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/WarrantyObligationsDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/WarrantyObligationsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://enphase.com/role/WarrantyObligationsWarrantyObligationsDetailsTextual" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductLiabilityContingencyLineItems" xlink:label="loc_us-gaap_ProductLiabilityContingencyLineItems_E3E5E629871A2C1886EC103F1D457993" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductLiabilityContingencyTable" xlink:label="loc_us-gaap_ProductLiabilityContingencyTable_62727A80B4E906962FF0103F1D449017" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ProductLiabilityContingencyLineItems_E3E5E629871A2C1886EC103F1D457993" xlink:to="loc_us-gaap_ProductLiabilityContingencyTable_62727A80B4E906962FF0103F1D449017" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductOrServiceAxis" xlink:label="loc_us-gaap_ProductOrServiceAxis_8F794A594F76DFDADAC6103F1D4455C8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ProductLiabilityContingencyTable_62727A80B4E906962FF0103F1D449017" xlink:to="loc_us-gaap_ProductOrServiceAxis_8F794A594F76DFDADAC6103F1D4455C8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_046E5CD2567891935639103F1D44615B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ProductOrServiceAxis_8F794A594F76DFDADAC6103F1D4455C8" xlink:to="loc_us-gaap_ProductsAndServicesDomain_046E5CD2567891935639103F1D44615B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_046E5CD2567891935639103F1D44615B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ProductOrServiceAxis_8F794A594F76DFDADAC6103F1D4455C8" xlink:to="loc_us-gaap_ProductsAndServicesDomain_046E5CD2567891935639103F1D44615B" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_SecondGenerationProductsMember" xlink:label="loc_enph_SecondGenerationProductsMember_5A0D92AA9B1B0FF360D5103F1D44E82C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_046E5CD2567891935639103F1D44615B" xlink:to="loc_enph_SecondGenerationProductsMember_5A0D92AA9B1B0FF360D5103F1D44E82C" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_ThirdGenerationProductsMember" xlink:label="loc_enph_ThirdGenerationProductsMember_CFEBE70E9584809D34E5103F1D454ED2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_046E5CD2567891935639103F1D44615B" xlink:to="loc_enph_ThirdGenerationProductsMember_CFEBE70E9584809D34E5103F1D454ED2" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_WarrantyVariableAxis" xlink:label="loc_enph_WarrantyVariableAxis_F0B417F2C4928C99F4D2103F1D45AC38" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ProductLiabilityContingencyTable_62727A80B4E906962FF0103F1D449017" xlink:to="loc_enph_WarrantyVariableAxis_F0B417F2C4928C99F4D2103F1D45AC38" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_WarrantyVariableDomain" xlink:label="loc_enph_WarrantyVariableDomain_E1B3D02E6F8FE375E690103F1D4516F5_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_enph_WarrantyVariableAxis_F0B417F2C4928C99F4D2103F1D45AC38" xlink:to="loc_enph_WarrantyVariableDomain_E1B3D02E6F8FE375E690103F1D4516F5_default" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_WarrantyVariableDomain" xlink:label="loc_enph_WarrantyVariableDomain_E1B3D02E6F8FE375E690103F1D4516F5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_enph_WarrantyVariableAxis_F0B417F2C4928C99F4D2103F1D45AC38" xlink:to="loc_enph_WarrantyVariableDomain_E1B3D02E6F8FE375E690103F1D4516F5" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_FailureRateMember" xlink:label="loc_enph_FailureRateMember_EAC6361252E88C59F0B6103F1D452F58" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_enph_WarrantyVariableDomain_E1B3D02E6F8FE375E690103F1D4516F5" xlink:to="loc_enph_FailureRateMember_EAC6361252E88C59F0B6103F1D452F58" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_ReplacementCostMember" xlink:label="loc_enph_ReplacementCostMember_383DC46CF46869945E0E103F1D45E412" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_enph_WarrantyVariableDomain_E1B3D02E6F8FE375E690103F1D4516F5" xlink:to="loc_enph_ReplacementCostMember_383DC46CF46869945E0E103F1D45E412" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_ClaimRateMember" xlink:label="loc_enph_ClaimRateMember_8D02F5EF2CA17DCBF882103F1D457928" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_enph_WarrantyVariableDomain_E1B3D02E6F8FE375E690103F1D4516F5" xlink:to="loc_enph_ClaimRateMember_8D02F5EF2CA17DCBF882103F1D457928" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_ShippingCostMember" xlink:label="loc_enph_ShippingCostMember_49BF19145054C76F9EB4103F1D45B145" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_enph_WarrantyVariableDomain_E1B3D02E6F8FE375E690103F1D4516F5" xlink:to="loc_enph_ShippingCostMember_49BF19145054C76F9EB4103F1D45B145" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StandardProductWarrantyDisclosureAbstract" xlink:label="loc_us-gaap_StandardProductWarrantyDisclosureAbstract_87107D0665399F1DB3D7103F1D4594B1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductLiabilityContingencyLineItems_E3E5E629871A2C1886EC103F1D457993" xlink:to="loc_us-gaap_StandardProductWarrantyDisclosureAbstract_87107D0665399F1DB3D7103F1D4594B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease" xlink:label="loc_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_103957E1E2ABCFD57E4E103F1D451174" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StandardProductWarrantyDisclosureAbstract_87107D0665399F1DB3D7103F1D4594B1" xlink:to="loc_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_103957E1E2ABCFD57E4E103F1D451174" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_ProductWarrantyExpenseIncreaseDecreaseinWarrantyExpenseDuetoChangesinWarrantyVariables" xlink:label="loc_enph_ProductWarrantyExpenseIncreaseDecreaseinWarrantyExpenseDuetoChangesinWarrantyVariables_819247FA269E1AA3A700103F1D46F791" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StandardProductWarrantyDisclosureAbstract_87107D0665399F1DB3D7103F1D4594B1" xlink:to="loc_enph_ProductWarrantyExpenseIncreaseDecreaseinWarrantyExpenseDuetoChangesinWarrantyVariables_819247FA269E1AA3A700103F1D46F791" xlink:type="arc" />
    <loc xlink:href="enph-20130930.xsd#enph_ProductWarrantyTerm" xlink:label="loc_enph_ProductWarrantyTerm_B7D5E2F0FBC6826EC3D1103F1D4665B5" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StandardProductWarrantyDisclosureAbstract_87107D0665399F1DB3D7103F1D4594B1" xlink:to="loc_enph_ProductWarrantyTerm_B7D5E2F0FBC6826EC3D1103F1D4665B5" xlink:type="arc" />
  </definitionLink>
</linkbase>
