Solar Panels comparison
QCells 400W Solar Panel vs Silfab 380W Black Solar Panel
Spec-by-spec comparison of the QCells 400W Solar Panel and Silfab 380W Black Solar Panel, with editorial commentary on which fits which use case.
| QCells 400W Solar Panel Solar Panel | Silfab 380W Black Solar Panel Solar Panel | |
|---|---|---|
| Price (MSRP) | $168 | $171 |
| Status | Active | Active |
| Wattage (Pmax) | 400 W | 380 W |
| Module efficiency (STC) | 20.8% | 21.4% |
| Cell type | PERC | PERC |
| Bifacial | No | No |
| Open-circuit voltage (Voc) | 37.16 V | 45.13 V |
| Short-circuit current (Isc) | 13.54 A | 10.5 A |
| Voltage at Pmax (Vmp) | 31 V | 38.88 V |
| Current at Pmax (Imp) | 12.9 A | 9.79 A |
| Front glass | 3.2mm thermally pre-stressed glass with anti-reflection technology | 3.2mm high transmittance, tempered, DSM anti-reflective coating |
| Frame | Black anodised aluminium | Anodized Aluminum (Black) |
| Output cable | 4 mm² | - |
| Cable length | 1250 mm | 1200 mm |
| Connector type | MC4 | MC4 |
| Dimensions | 1692 × 1134 × 30 mm | 1795 × 990 × 38 mm |
| Weight | 21.2 kg | 19 kg |
| Temp. coefficient (Pmax) | -0.34 %/°C | -0.377 %/°C |
| Temp. coefficient (Voc) | -0.27 %/°C | -0.279 %/°C |
| Temp. coefficient (Isc) | 0.04 %/°C | 0.046 %/°C |
| Mechanical load | 5400 Pa front / 3600 Pa back | 5400 Pa front / 4000 Pa back |
| Operating temp. | -40°C to 85°C | -40°C to 85°C |
| Product warranty | 12 years | 25 years |
| Performance warranty | 25 years | 30 years |
| Buy | signature solar → | current connected → |
Where each one wins
QCells Q.PEAK DUO M-G11 400 wins on wattage (400W vs 380W), temperature coefficient (-0.34 %/°C vs -0.377 %/°C). Higher wattage means fewer panels for the same system size. On a typical 8 kW residential array that is 20 fewer or extra watts per panel — meaningful when roof space is constrained.
Silfab Elite SIL-380-BK wins on efficiency (20.8% vs 21.4%), product warranty (12 years vs 25 years), price ($168 vs $171). Module efficiency is what determines watts-per-square-meter. The higher number wins on tight roofs; below ~21.5% you start needing extra panels to hit the same system size.
The right pick depends on which dimensions matter most to you. The spec table above lays out the full envelope; the chat panel below answers "which one for {use case}" if you want a directed recommendation.
QCells
400W Solar Panel
$168
Watch out for
- ! Product warranty is only 12 years — shorter than premium tier-1 panels
Silfab
380W Black Solar Panel
$171
Best for
- ✓ long-hold projects (25+ year product warranty)
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Catalog-grounded answers. Suggest alternatives, sanity-check fit, dig into specs.
Ask anything about solar gear, comparisons, recommendations, edge cases. I'll cite specs from our catalog and link to product details.