How Much Energy per Acre from the Sun Hits the Earth? How Much of that Energy does a Corn Field Capture?
Describes the Solar Radiation that falls on an area above the atmosphere at a vertical angle: s = 1.37 kW / m².
In space, solar radiation is practically constant; on earth it varies with the time of day and year as well as with the latitude and weather. The maximum value on earth is between 0.8 and 1.0 kW / m². In Germany, the average annual amount of insolation varies between 950 and 1100 kWh / m², depending on the region.