td97 Posted May 22, 2019 Share Posted May 22, 2019 I am modeling a bifacial system and seeing performance ratios >100% in winter months. There is high albedo due to snow during this time so I am wondering whether this is somehow due to backside gain, but is this accurate? Am I somehow missing some losses or something that should be accounted for? Thanks!! Link to comment Share on other sites More sharing options...
Michele Oliosi Posted April 28, 2022 Share Posted April 28, 2022 Hi, Yes the standard PR in PVsyst is normalized with respect to the frontside irradiance only. Since version 7.2.13 you can find an adapted bifacial PR in the results summary. See https://www.pvsyst.com/help/performance_ratio.htm Link to comment Share on other sites More sharing options...
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