Bifacial / Bifacial solar modules – Image: Xpert.Digital / abriendomundo|Shutterstock.com
With glass modules with bifacial cell technology, the light is captured on both the front and back of the module. Increasing the use of light increases the efficiency of the module. Up to 360 Wp total power can be achieved via the active rear of the module (290 Wp only at the front / total 320 - 360 Wp).
The efficiency gain depends on the radiation situation (atmosphere and background).
- Low/medium reflective surfaces (e.g. tiled roof, grass); Installation distance to the surface at least 40 cm
- Well-reflective surfaces (e.g. flat roof with gray foil, sand); Installation distance to the floor 60 cm – 1.5 m
- Very good reflective surfaces (e.g. glaciers, snow); Installation distance to the floor greater than 1.5 m
Bifacial/Bifacial solar modules how they work
How bifacial/bifacial solar modules work – Image: Xpert.Digital
Bifacial/Bifacial derivation
In botany, bifacial refers to a specific category of leaves on a plant. This can be named according to its origin and the arrangement of the tissue. One speaks of a bifacial leaf if it has a top and bottom surface, the leaf primordia emerge from both sides and the tissue is arranged in a specific structure.
The term bifacial is derived from the Latin for bi (two, two) and facies (external appearance, appearance).
The main advantages
Additional power generation gains: Compared to P solar cells, N solar cells tend to significantly increase efficiency. Bifacial solar cells will have a broader application perspective due to the bifacial generation capacity and higher system efficiency, and are particularly suitable for snowier areas and distributed generation systems such as roofs, fences and sound barriers.
The cell backside efficiency can reach more than 19%, and the incident backlights can be used to improve the generation capacity of the system, with the unit area capacity increase up to 10%~30%.
With the glass module with bifacial cell technology, the light is captured on both the front and back of the module. Increasing the use of light increases the efficiency of the module. Up to 360 Wp total power can be achieved via the active rear of the module (290 Wp only at the front / total 320 - 360 Wp).
The efficiency gain depends on the radiation situation (atmosphere and background).
Free space system with bifacial solar modules example
Roof system with bifacial solar modules example
Bifacial solar modules overhead substructure example
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