Usually, the warranty will guarantee a 90% power output for the first 10 years and a 80% power output for the entire 25 years. In fact, some panels can even rem

Usually, the warranty will guarantee a 90% power output for the first 10 years and a 80% power output for the entire 25 years. In fact, some panels can even remain over 80% efficient past the end of their lives. https://www.deegesolar.co.uk/how_long_do_solar_panels_last/ https://www.deegesolar.co.uk/how_long_do_solar_panels_last/