Insolation Solar Radiation
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The actual amount of sunlight falling on a specific geographical location is known as insolation—or "incident solar radiation."
When sunlight reaches the Earth, it is distributed unevenly in different regions. As you would expect, the areas near the Equator receive more solar radiation than anywhere else on the Earth.
Sunlight varies with the seasons, as the rotational axis of the Earth shifts to lengthen and shorten days with the changing seasons.
Other factors affect he quantity of sunlight reaching any region such as
The above factors all affect the amount of solar energy that is available to PV systems.
Insolation values for a specific site are sometimes hard to obtain because
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