Panel type affects efficiency, roof space needed, and price — not just the spec sheet.
Quick comparison
- Monocrystalline — highest efficiency, best for tight roofs.
- Polycrystalline — lower cost, needs more roof area for the same output.
- Bifacial — captures reflected light on both sides, suited to open ground-mounts.
"The 'best' panel is the one that fits your roof's actual constraints, not the highest spec sheet."
| Type | Typical efficiency |
|---|---|
| Polycrystalline | 15–17% |
| Monocrystalline | 19–22% |
| Bifacial | 21–24%* |
*With a reflective surface below. Panel choice directly affects how many panels you'll need. See real layouts with Solar 3D Design.