IMPACT OF USING SPECTRALLY RESOLVED GROUND ALBEDO DATA FOR PERFORMANCE SIMULATIONS OF BIFACIAL MODULES

摘要

We simulate the average annual current gain f_(bif,spe) of bifacial PV modules versus monofacial PV modules for various ground albedos and mounting conditions. Our in-house developed ray tracing framework Daidalos is used to compute various spectrally resolved rear and front side photon flux. We demonstrate that the annual current gain f_(bif,spe) and as a consequence the energy yield of a bifacial module may vary by up to 35%_abs when considering different ground albedos and by up to 10%_abs when considering different mounting heights. Considering the difference between using spectrally resolved albedo data and averaged albedo data with respect to wavelength, we find relative deviations in the bifacial gain of up to 19.5%_(rel). We find that the deviation is reduced to 2.6%_(rel) by weighting the albedo with both the external quantum efficiency of the photovoltaic module and the spectrum.