Green loan
Borrow €7,500–€100,000 for new or used rooftop solar panels and battery storage, with no land-register charge, if you meet the personal income and credit requirements.
SWK Bank
SWK Bank is the brand of Süd-West-Kreditbank Finanzierung GmbH, based in Mainz. It offers personal loans, including the purpose-bound Ökokredit.