Quick Summary
Bifacial solar panels generate electricity from both sides of the module. The front absorbs direct sunlight, while the transparent back collects reflected light from the ground (albedo), increasing energy yields by 10% to 30%.
Bifacial systems are usually mounted on ground racks or flat commercial roofs with light-colored, reflective gravel or concrete surfaces to maximize albedo reflection.
What is Albedo Gain?
Albedo is a measure of ground reflectivity. Light-colored surfaces reflect more photons onto the backside of bifacial panels:
- White Rock/Concrete: 60% – 80% reflectivity (highest bifacial gain).
- Light Sand/Soil: 25% – 40% reflectivity.
- Green Grass: 15% – 25% reflectivity (moderate gain).
Frequently Asked Questions
Can you install bifacial panels on standard shingles?
No. Standard shingle roofs sit flush with the roof, meaning light cannot reach the backside. They require raised ground mounts or commercial racking.