Depends on the manufacturer, by the looks of it: https://news.energysage.com/how-long-do-solar-panels-last/ https://news.energysage.com/how-long-do-solar-panels

Depends on the manufacturer, by the looks of it: https://news.energysage.com/how-long-do-solar-panels-last/ https://news.energysage.com/how-long-do-solar-panels-last/ .3%/year would be 85% after 50 years, so I was off by a bit.