FAQ – Backcontact Solar Modules

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What are the advantages of BC modules?

• Premium look: No silver busbars on the front.

• Higher output: More active cell area captures more light.

• Greater efficiency: Lower series resistance.

• Better cooling: Less heat, less power loss in hot weather.

• Partial shading tolerance: Stable output, fewer hotspots, longer lifespan.
   

What’s the difference between HBC, IBC, BC, and xBC?

• BC (Back Contact) = all contacts on the cell’s rear side for higher power density, sleek aesthetics, and better shading tolerance.

• IBC: Interdigitated contacts interlock for maximum efficiency.

• HBC, TBC, HPBC, xBC: Other BC variants, differing in cell tech, materials, or passivation.

• All are back-contact technologies — the difference is in cell design details.
   

Why are BC modules better in partial shading?

Current flows on the rear side, so leaves, branches, or chimneys don’t immediately disrupt output. BC modules only switch to bypass when six half-cells are shaded — meaning higher yield and less hotspot stress over time.
 

Which roofs are ideal?

All roof types, shaded or unshaded. Especially good for:

• Roofs with chimneys, dormers, or antennas

• East-/west-facing roofs

• Near trees or temporary shading from buildings
   

Are BC modules the solution for shaded roofs?

Not for full shading, but far better under partial shading — common on most rooftops — boosting annual yield.

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Can BC modules be bifacial?

Yes. For example, the SOLYCO 108nBC.6 / 485 harvests light from both sides for up to 30% more output.

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Any drawbacks?

lightly higher price due to higher productions costs.