solar power reaching the earth is about 1350 W/m^2 outside the earths atmosphere, and 950 W/m^2 on earth surface normal to the sun on a clear day.

solar power reaching the earth is about 1350 W/m^2 outside the earths atmosphere, and 950 W/m^2 on earth surface normal to the sun on a clear day.Some on is marketing 2m*3m photovoltaic cell panels with the claim that a single panel can meet the eletricity