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...Solar radiation the output of sun is kw energy reaching earth kwh year when light travels from outer space to lost because following reasons scattering rays collide with particles present in atmosphere absorption water vapor there cloud cover are diffused clouds reflection hit mountains on surface climate latitude location day time also affects amount received by place insolation it a quantity indicating incident power unit commonly expressed units m at s oriented normal called constant and its value due atmospheric effects peak terrestrial noon clear order level often denoted i graph shown gives different wavelengths can be seen that form thermal pv captures visible region infrared irradiance an essentially integrated respect data represented average daily basis hours psh thought as number equivalent worldwide optimally surfaces approximately or h measurement we know made up ions other including passes through some penetrates falls directly panel diffuses gets reflected surroundings r...