PR is above 100% after PVSyst simulation for vertical Panels (90°) in Ground Mount arrangement.

[navdeep4solar]

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

[Jeremie]

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

[Michele Oliosi]

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.