Solar Panel Comparison
JA Solar Deep Blue 3.0 420W PERC vs SunPower/Maxeon Maxeon 3 400W
The Deep Blue 3.0 420W PERC delivers 420W, 20W more than the Maxeon 3 400W at 400W.
Maxeon 3 400W has a higher efficiency of 22.6% versus 21% for the Deep Blue 3.0 420W PERC.
They use different cell technologies: Deep Blue 3.0 420W PERC uses Mono PERC MBB Half-Cell, while Maxeon 3 400W uses Monocrystalline IBC Gen III.
Here's how they compare across all key specifications.
Spec
JA Solar
Deep Blue 3.0 420W PERC
420W
21% efficiency
SunPower/Maxeon
Maxeon 3 400W
400W
22.6% efficiency
Full Specification Comparison
| Spec | Deep Blue 3.0 420W PERC | Maxeon 3 400W |
|---|---|---|
| Performance | ||
| Power Output | 420 W | 400 W |
| Efficiency | 21% | 22.6% |
| Cell Type | Mono PERC MBB Half-Cell | Monocrystalline IBC Gen III |
| Temp. Coeff. | — | -0.27 %/°C |
| Number of Cells | 108 | 104 |
| Bifacial | No | No |
| Electrical | ||
| Voc | — | 75.6 V |
| Vmp | 37.73 V | 65.2 V |
| Isc | — | 6.65 A |
| Imp | — | 6.14 A |
| Max System Voltage | 1000 V | 1000 V |
| Operating Temp | -40 to +85 °C | -40 to +85 °C |
| Physical | ||
| Dimensions | 1762x1134x30 mm | 1046x1690x40 mm |
| Weight | 20 kg | 19 kg |
| Frame Colour | Black | Black |
| Connector Type | MC4 | Staubli MC4 |
| Warranty & Certification | ||
| Product Warranty | 12 years | 25 years |
| Power Warranty | 25 years linear | 25 years (92% at yr 25, 0.25%/yr degradation) |
| MCS Certified | Yes | No |
| Certifications | IEC 61215, IEC 61730 | IEC 61215, IEC 61730, UL 61730 |
| Pricing (UK) | ||
| Retail Price | £57.81 | — |
| Price per Watt | £0.138/W | — |
Frequently Asked Questions
Which is more efficient, the Deep Blue 3.0 420W PERC or the Maxeon 3 400W?
The Maxeon 3 400W is more efficient at 22.6%, compared to 21% for the Deep Blue 3.0 420W PERC. Higher efficiency means more power generated per square metre of roof space.
Which panel produces more power, the Deep Blue 3.0 420W PERC or the Maxeon 3 400W?
The Deep Blue 3.0 420W PERC has a higher rated output at 420W. This means fewer panels would be needed to reach the same system size compared to the Maxeon 3 400W.
Which solar panel should I choose for my home — the Deep Blue 3.0 420W PERC or the Maxeon 3 400W?
The right choice depends on your priorities. If maximising energy generation per panel is key, consider efficiency and wattage. If budget is your main concern, compare price per watt. Both panels have their merits — use our Solar Estimator to see how each would perform in your specific home setup.
JA Solar
Deep Blue 3.0 420W PERC
420W · 21% efficiency · Mono PERC MBB Half-Cell
View full specs →SunPower/Maxeon
Maxeon 3 400W
400W · 22.6% efficiency · Monocrystalline IBC Gen III
View full specs →More Comparisons
See how these panels perform in your home
Use our Solar Estimator to calculate system size, installation cost, and payback period — with either of these panels as a starting point.