For the time being, the definition of the solar model is only based on the date, time and orientation. When the model is not with a true north, it needs to be rotated beforhands, we can't choose the directe/diffuse values and distribution, and mostly, we have no idea what the conditions are. I had to have a study with a 1sqm surface and numerous runs to have an idea of what parameters to use for my real studies. There is an absolute need of having the orientation, solar load and diffuse ration as inputs for studies with solar radiation.
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