Bifacial calculation for inclination angles lower than 10 degrees

[Felix Galan]

I have seen in the below link that PVSol has decided not to calculate the radiation gains of bifacial panels for inclination angles lower than 10 degrees. Will this be considered in the future?

This affects one of my model for a carport with a 7-degree inclination. It is a big system (almost 1MWp) in which the gained radiation might make a difference, as I try to optimise the system to export as minimum electricity as possible.

For others cases with elevation between 10 and 80 degree, how is the rear albedo calculated? Is it possible to input this value?

Thanks

https://forum.valentin-software.com/topic/1325-wrong-amount-of-pv-generator-energy-ac-grid/ 

[hotline_oh]

Dear Felix Galan,

It is not planned to consider the radiation gains of bifacial panels for inclination angles lower than 10 degrees.

Bifacial modules are calculated in PV*SOL like conventional PV modules, which are subject to increased irradiation. The increased or effective irradiation is defined via:

𝐸effective=𝐸front+𝐸rear⋅𝐵𝐹

The “bifacial factor” 𝐵𝐹 is a database specification of the PV module. Typical values are between 0.7 and 0.8 (70 to 80 %). The factor indicates what percentage of the power incident on the back of the PV module can be used to generate electricity. You can find more information in our help section.

You cannot directly change the bifacial factor of a PV module in our database. However, you can create a new data record by copying an existing module (right-click --> Copy), editing it and saving it again. Further information can be found in the help section.