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Solar panels installed in France in 1992 found to retain a remarkable 79% of original output | Still going strong after 31 years
In 1992, a small 1-kilowatt solar array called Phébus 1 was connected to the French grid by Hespul, a nonprofit renewable energy association based in Lyon, France....
After dismantling the vintage 10 square meter array last year, technicians ran the panels through rigorous lab testing per international standards and found astonishing results. The association cites a long-term Swiss study and recent American and European research showing median solar panel degradation rates from 0.36 to 0.75 percent annually. So, while declines in output are inevitable as the years go by, this real-world data demonstrates solar installations can keep on trucking for a few decades, remaining at highly viable performance levels.
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