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How Long Do Solar Panels Last? Solar Panel Lifespan 101
For example, a 0.75% degradation rate means that in year two, your panels will operate at 99.25% of their original output; by the end of their 25-year useful life, they will still be operating at 81.25% of their original capacity. Interestingly, the study found that systems in cooler climates performed better, with degradation rates of about 0.48% per year, while systems in hotter temperature zones showed higher degradation rates of about 0.88% per year.