Bifacial Solar Gain Calculator

Estimate the additional energy production from bifacial solar panels.

Rear-to-front power ratio from datasheet
Height from ground to panel bottom
Distance between panel rows

Bifacial Gain Formula

Rear Irradiance = GHI x Albedo x View Factor
Rear Power = Front Power x Bifaciality x (Rear Irr / 1000)
Bifacial Gain = Rear Power / Front Power x 100%

Typical Albedo Values

Surface Albedo Expected Gain
Fresh snow70-90%15-25%
White gravel40-60%10-18%
Light concrete25-40%6-12%
Grass/vegetation15-25%4-8%
Dark asphalt5-15%2-5%