Question

How to calculate solar radiation on tilted surface?

Answer 1

calculate the radiation incident on a tilted surface given either the solar radiation measured on horizontal surface or the solar radiation measured perpendicular to the sun . Tilting the module to the incoming light reduces the module output.
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Answer 2

The following figure shows how to calculate the radiation incident on atilted surface (Smodule) given either thesolar radiation measured on horizontalsurface (Shoriz) or the solar radiationmeasured perpendicular to the sun (Sincident). Tilting the module to the incoming light reduces the module output.