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Only solar radiation incident on the normal side (pointing outward, the side the right-hand rule points to) of the surface will generate electricity. I supposed you could create two surfaces, one pointing at the sky and one pointing at the roof, with two Generator:Photovoltaic object referencing each of the surfaces, to model bifacial PV. You'd need to adjust PhotovoltaicPerformance for each appropriately, as I'd image the backside of the panel is not as efficient as the front side. I've never done this before, but I imagine it would work.