navdeep4solar Posted September 3 Share Posted September 3 Greetings, While doing a PVSyst simulation for a project having vertical panels(90°) on a ground mount arrangement, I get an unexplainable PR of 122% for the given orientations, also th global incident is in negative. I have attached the PVSyst Report for you refrence, please provied an answer Link to comment Share on other sites More sharing options...
Jeremie Posted September 6 Share Posted September 6 Hello, to better assist you with your issue please send the export of your project in zip format to our support : support@pvsyst.com Regards Link to comment Share on other sites More sharing options...
Michele Oliosi Posted September 6 Share Posted September 6 This is normal, since PR is defined normalized by the front-side POA irradiance (GlobInc) but bifacial modules can also capture light from the back. The PR of bifacial projects is oftentimes > 1. There are more details on this help page: https://www.pvsyst.com/help/performance_ratio.htm Regarding the negative Global Incident, this is also normal, because it accounts for the front side irradiance relative to the horizontal plane. If you just look at the front-side, there is more irradiance on a horizontal plane than on a vertical plane. This is of course more than compensated by the backside irradiance part of the loss diagram. Link to comment Share on other sites More sharing options...
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