German Startup Revives Old Solar Panels with AI-Powered Testing

A German startup is giving old solar panels a second life through advanced testing. Better Sol, backed by the German Federal Environmental Foundation (DBU), has developed a system to evaluate used photovoltaic modules for reuse. Their process combines automation, AI, and detailed inspections to determine which panels still have years of service left.

Better Sol's testing method begins with a multi-stage optical inspection, followed by a performance check and an electrical safety test. Each module receives a label showing its test results, performance class, and a full report. The company claims that, on average, one in two decommissioned panels remains functional and can be reused.

The startup currently tests modules primarily from large solar parks, where operators often decommission entire systems even when many panels still work. To streamline the process, Better Sol plans to introduce a mobile testing unit that can assess panels directly at decommissioning sites. Once certified, the used panels are sold through Better Sol's website to private households and industrial buyers. The approach aligns with calls from environmental experts like Alexander Bonde, DBU's Secretary-General, who stresses the need to preserve functional materials through circular economy practices. Solar power already accounts for around 24 percent of Germany's electricity, making it the country's second-largest domestic energy source. Reusing panels could further boost green energy output while cutting waste.

Better Sol's system offers a practical way to extend the lifespan of solar panels. By identifying reusable modules, the company helps reduce waste and supports Germany's renewable energy goals. The startup's mobile testing unit, once deployed, will make the process even more efficient for solar park operators.