400W Solar Panel
Solar Panel
400 W mono PERC monofacial solar panel with 20.8% module efficiency. 12-year product / 25-year power warranty.
Normalized price
$0.42 per watt
$168 listed price
Methodology: lowest in-stock merchant price · normalized to nameplate
The data
Specifications
Electrical
| Wattage (Pmax) | 400 W |
|---|---|
| Module efficiency (STC) | 20.8% |
| Cell type | PERC |
| Bifacial | No |
| Open-circuit voltage (Voc) | 37.16 V |
| Short-circuit current (Isc) | 13.54 A |
| Voltage at Pmax (Vmp) | 31 V |
| Current at Pmax (Imp) | 12.9 A |
Construction
| Front glass | 3.2mm thermally pre-stressed glass with anti-reflection technology |
|---|---|
| Frame | Black anodised aluminium |
| Output cable | 4 mm² |
| Cable length | 1250 mm |
| Connector type | MC4 |
| Dimensions | 1692 × 1134 × 30 mm |
| Weight | 21.2 kg |
Environmental
| Temp. coefficient (Pmax) | -0.34 %/°C |
|---|---|
| Temp. coefficient (Voc) | -0.27 %/°C |
| Temp. coefficient (Isc) | 0.04 %/°C |
| Mechanical load | 5400 Pa front / 3600 Pa back |
| Operating temp. | -40°C to 85°C |
Warranty & compliance
| Product warranty | 12 years |
|---|---|
| Performance warranty | 25 years |
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Editorial
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Watch out for
- Product warranty is only 12 years — shorter than premium tier-1 panels
The market
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Price history
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The shortlist
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Common questions
What people ask about the 400W Solar Panel
Will the QCells 400W Solar Panel qualify for the federal solar tax credit?
FEOC compliance for QCells 400W Solar Panel hasn't been independently confirmed by us. Section 25D — the residential ITC — expired Jan 1, 2026, so for cash purchases the question is moot. For leases or TPO, ask the installer to provide manufacturer FEOC documentation before signing.
What does the warranty actually cover?
QCells 400W Solar Panel carries a 12-year product warranty (defects in materials and workmanship) and a 25-year linear performance warranty. The product warranty matters most: panels in residential service rarely degrade past spec, but they do occasionally fail electrically. A short product warranty (under 15 years) is the bigger flag than a short performance warranty.
How does the temperature coefficient affect real-world output?
QCells 400W Solar Panel has a Pmax temp coefficient of -0.34%/°C. In summer, panel cells regularly run 25–35°C above ambient — so a 35°C cell at peak sun will lose roughly 11.9% of nameplate power. Panels with coefficients closer to -0.25%/°C (better) lose less in heat than panels at -0.35%/°C (worse). For hot-climate installs (TX, AZ) this gap is real annual production.
Is this panel bifacial?
No — QCells 400W Solar Panel is monofacial (front-side only). Bifacial panels capture diffuse light on the back side too, but the realistic gain on a typical residential roof is only 2–5% in practice. It's not a feature most homeowners notice the absence of.
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