"Fleet-scale, real-world solar performance ratio declines by 0.59% per year." I've heard 1% before. At 0.59%, the panels reach 80% after about 35 years. By wh

"Fleet-scale, real-world solar performance ratio declines by 0.59% per year." I've heard 1% before. At 0.59%, the panels reach 80% after about 35 years. By which time they may be at 60% of whatever panels are on sale then.