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COMMITMENTS AND CONTINGENCIES - Commitments to Fund Investments (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
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Commitments and Contingencies Disclosure [Abstract] |  |
Total original loan commitments | $ 121,570,101 | $ 0
Less: drawn commitments | (97,547,112) | 0
Total undrawn commitments | $ 24,022,989 | $ 0

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- Definition Amount drawn from loan commitments. + References No definition available. + Details
Name: | suns_ContractualObligationDrawnLoanCommitments
Namespace Prefix: | suns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Loan commitments to fund various senior term loans, equipment loans and bridge loans. + References No definition available. + Details
Name: | suns_ContractualObligationLoanCommitments
Namespace Prefix: | suns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant