Good day,

I am trying to model a PV panel; in order to accurately predict the absorbed solar energy, it is not enough to calculate the incident solar radiation, but one needs to have the absorbed radiation.

However, I found out that the absorbance of materials is different for direct, diffused and reflected solar rays; furthermore, this absorbance is affected by the incidence angle of solar radiation.

I need to find some correlations and data on the above subject.

Any suggestions?

Thank you,

Patrick 

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