Changes to Test Methods and Requirements for Solar Energy Kits in IEC TS 62257-9-5:2024 and IEC TS 62257-9-8:2025
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This document summarizes key changes to the new versions of the test methods and quality standards for solar energy kits (IEC TS 62257-9-5:2024 and IEC TS 62257-9-8:2025). The changes are intended to simplify solar energy kit testing and certification.
From January to June 2025, companies may choose which version of the test methods they would prefer to use. As of July 2025, VeraSol will begin requiring labs to test according to the new methods and tested products must comply with the revised requirements in IEC TS 62257-9-8.
Note, this document provides a high-level summary of the changes – the new documents are available for purchase on the IEC website (IEC TS 62257-9-5:2024 and IEC TS 62257-9-8:2025) and VeraSol is working to develop additional materials to provide more detailed guidance about the new versions of the documents.