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Vertical bifacial PV system full shading after noon


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I am trying to model a bifacial vertical PV system, with the front side facing east. Before noon, as long as the sun faces the front side of the modules, the shading simulation works according to our expectations. However, after noon, when the sun faces the rear side of the modules, the front side is assumed to be completely shaded, giving a shading factor of 1 (in the shading table marked as "behind"), and the output is 0. However, I would expect that the rear side irradiation gives a reduced output of the module; basically the same as before noon, though limited by the bifaciality of the module.

I did not find any way to get rid of the problem. Is it possible to model such systems in PVSyst yet? My PVSyst version is 7.2.


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