PR>100% on bifacial model

[td97]

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!!

[Michele Oliosi]

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