Pretty good. You can download several years of data from my domestic panels at https://shkspr.mobi/blog/2020/07/1800-days-of-minute-by-minute-solar-generation-d

Pretty good. You can download several years of data from my domestic panels at https://shkspr.mobi/blog/2020/07/1800-days-of-minute-by-minute-solar-generation-data/ https://shkspr.mobi/blog/2020/07/1800-days-of-minute-by-minu... Sure, some days they'll be covered by snow. But in industrial systems that can easily be melted / brushed off. Obviously they don't generate as much in winter as in summer. But cool bright winter days are surprisingly plentiful.