Didduse Ground Factor and view factor

Hello SAM community !! 

I am new at SAM and want to know how do you estimate or calculate ground diffuse factor and view factor for rear side 

thank you 

Hello,

You can find technical descriptions of SAM's PV models here: sam.nrel.gov/photovoltaic/pv-publications.html

See the references under "Bifacial Modules" for documents describing the rear-side irradiance calculations.

Best regards,
Paul.