Researchers at SUPSI found that six Swiss PV systems installed in the late 1980s and early 1990s show exceptionally low degradation rates of just 0.16% to 0.24% per year after more than 30 years of operation. The study shows that thermal stress, ventilation, and material design play a greater role in long-term module reliability than altitude or irradiance alone…
https://www.pv-magazine.com/2026/01/30/study-finds-much-lower-than-expected-degradation-in-1980s-and-1990s-solar-modules/
