The quick answer
Bifacial panels can use light reaching both sides, but rear-side benefit depends on the roof surface, mounting clearance and shading. Ask for a layout-specific assessment instead of assuming a fixed extra generation percentage.
Why does the space behind a bifacial panel matter?
A bifacial module receives light on its front and rear. Waaree’s installation guidance explains that rear illumination affects output and that support structures should avoid shading the back of the module. A product label alone cannot establish the benefit on a particular roof.
For a Bengaluru rooftop, ask the installer to consider the surface below the array, clearance, nearby obstructions and mounting design. Do not repaint or modify a roof purely on a general marketing claim; discuss waterproofing, maintenance and the actual design first.
TOPCon and bifacial describe different product characteristics
TOPCon refers to a cell technology, while bifacial describes the ability to receive light on both sides. They are not opposing categories: a module can have both characteristics. When comparing products, use the exact datasheet rather than treating the names as a complete specification.
Pai Power Solutions lists Waaree bifacial products alongside Novasys TOPCon products. Compare the proposed models on dimensions, electrical ratings, mounting requirements and documented warranty terms. Request a clear explanation of any generation estimate and its assumptions.
- Rear-side shading and roof clearance
- Exact module datasheet and dimensions
- Mounting structure and roof access
- Estimate assumptions and warranty documents
When should you request a bifacial assessment?
Ask for an assessment when planning a new roof array or comparing alternative module layouts. Share photographs of the whole roof, including tanks, parapets and nearby structures. A ground-mounted or elevated proposal needs its own site and structural evaluation.
Confirm the entire installation scope and current BESCOM requirements for a grid-connected system. Do not assume that a module described as bifacial is automatically DCR compliant or eligible for a particular subsidy; check the exact model and applicable scheme conditions.
Common questions
Will bifacial panels produce a fixed percentage more power?
No fixed gain should be assumed. Rear-side illumination, shading, mounting and site conditions affect performance. Ask for the assumptions behind the proposed estimate.
Can a TOPCon panel also be bifacial?
Yes. TOPCon describes cell technology and bifacial describes two-sided light collection. Check the exact model datasheet for both characteristics.
Sources & further reading
Published 8 October 2026. Confirm current model documents and applicable connection or scheme requirements before ordering. This guide supports a buying discussion; the final design depends on your site.