The amount of energy striking the earth from the sun is about 1,370W/m2 (watts per square meter), as measured at the top of the atmosphere. This is the solar irradiance. The value at the earth's surface varies arou. .
When this sunlight strikes a solar panel, about 10-20% of the energy is converted to electricity. So a good (20% efficient) 10kW array would measure 50 m2, or about 7m by 7m.. .
Theoretically, the maximum output you can get from a solar panel will be for a panel lying flat at the equator under a clear sky when the sun is at its zenith, such that sunlight strikes th. .
For any given time period, we can define the capacity factor (cf)of a particular solar panel or array. This is the amount of energy output given vs the maximum possible output (the sam. .
There are lots of different ways to calculate the capacity factor for a given panel installation, and it can be calculated over lots of different time periods -- the usual case is to calcula. [pdf]
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