Three-year average solar radiation square feet of horizontal surface for peak summer months; about 70 cities listed; highest radiation is in Phoenix with 200; lowest is Caribou, ME. at 115. (RMH)
Three-year average solar radiation square feet of horizontal surface for peak summer months; about 70 cities listed; highest radiation is in Phoenix with 200; lowest is Caribou, ME. at 115. (RMH)