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  <xs:element id="suns_LoansHeldForInvestmentAndFinancingReceivableBeforeAllowanceForCreditLoss" abstract="false" name="LoansHeldForInvestmentAndFinancingReceivableBeforeAllowanceForCreditLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_InterestReceivables" abstract="false" name="InterestReceivables" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_UnusedFeesReceivable" abstract="false" name="UnusedFeesReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_PaidInKindInterestReceivable" abstract="false" name="PaidInKindInterestReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_OtherFeesReceivable" abstract="false" name="OtherFeesReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_RevolvingCreditFacilityOtherMember" abstract="true" name="RevolvingCreditFacilityOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_SRTFRevolvingCreditFacilityMember" abstract="true" name="SRTFRevolvingCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_LineOfCreditFacilityAccordionFeatureIncreaseLimit" abstract="false" name="LineOfCreditFacilityAccordionFeatureIncreaseLimit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_DebtInstrumentAgentFee" abstract="false" name="DebtInstrumentAgentFee" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_LineOfCreditFacilityCommencementOfPaymentOfUnusedCapacityCommitmentFeePercentage" abstract="false" name="LineOfCreditFacilityCommencementOfPaymentOfUnusedCapacityCommitmentFeePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="suns_LineOfCreditFacilityLiquidityCovenantMinimumAmount" abstract="false" name="LineOfCreditFacilityLiquidityCovenantMinimumAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_LineOfCreditFacilityLiquidityCovenantOutstandingObligationsPercent" abstract="false" name="LineOfCreditFacilityLiquidityCovenantOutstandingObligationsPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="suns_LineOfCreditFacilityCovenantQuarterlyDebtServiceCoverageRatioMinimum" abstract="false" name="LineOfCreditFacilityCovenantQuarterlyDebtServiceCoverageRatioMinimum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="suns_LineOfCreditFacilityCovenantLeverageRatioMaximum" abstract="false" name="LineOfCreditFacilityCovenantLeverageRatioMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="suns_ContractualObligationLoanCommitments" abstract="false" name="ContractualObligationLoanCommitments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_ContractualObligationDrawnLoanCommitments" abstract="false" name="ContractualObligationDrawnLoanCommitments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_ShelfRegistrationStatementMember" abstract="true" name="ShelfRegistrationStatementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_January2025PublicOfferingMember" abstract="true" name="January2025PublicOfferingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_AtTheMarketOfferingProgramMember" abstract="true" name="AtTheMarketOfferingProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_DividendReinvestmentPlanMember" abstract="true" name="DividendReinvestmentPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_EquityIncentivePlan2024Member" abstract="true" name="EquityIncentivePlan2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_SaleOfStockMaximumAggregateOfferingAmount" abstract="false" name="SaleOfStockMaximumAggregateOfferingAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_SaleOfStockConsiderationReceivedOnTransactionUnderwritingDiscounts" abstract="false" name="SaleOfStockConsiderationReceivedOnTransactionUnderwritingDiscounts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_SaleOfStockCommissionPercentage" abstract="false" name="SaleOfStockCommissionPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="suns_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedCumulative" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedCumulative" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="suns_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareLimit" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardShareLimit" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="suns_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedCumulative" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedCumulative" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="suns_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedCumulative" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedCumulative" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="suns_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedCumulative" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedCumulative" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="suns_ExerciseTaxAsAPercentageOfUndistributedOrdinaryIncomeAndNetCapitalGains" abstract="false" name="ExerciseTaxAsAPercentageOfUndistributedOrdinaryIncomeAndNetCapitalGains" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="suns_LoansHeldForInvestmentFairValue" abstract="false" name="LoansHeldForInvestmentFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="suns_MembersAndTrustsMember" abstract="true" name="MembersAndTrustsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_ChiefLegalOfficerMember" abstract="true" name="ChiefLegalOfficerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_PercentageOfBaseManagementFees" abstract="false" name="PercentageOfBaseManagementFees" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="suns_PercentageOfAggregateAmountOfAnyOutsideFees" abstract="false" name="PercentageOfAggregateAmountOfAnyOutsideFees" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="suns_OwnershipInterestPercentage" abstract="false" name="OwnershipInterestPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="suns_NumberOfCoInvestedLoansHeld" abstract="false" name="NumberOfCoInvestedLoansHeld" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="suns_QualifiedDividends" abstract="false" name="QualifiedDividends" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="suns_ReturnOfCapitalDistributionPerShare" abstract="false" name="ReturnOfCapitalDistributionPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="suns_Section199ADividends" abstract="false" name="Section199ADividends" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="suns_FourBorrowersMember" abstract="true" name="FourBorrowersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_IndustrialUseSubordinateDebtMember" abstract="true" name="IndustrialUseSubordinateDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="suns_ReceivableWithImputedInterestDiscountRate" abstract="false" name="ReceivableWithImputedInterestDiscountRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
</xs:schema>
