Solar Panel Comparison
JA Solar Deep Blue 3.0 420W PERC vs JA Solar Deep Blue 4.0 440W N-Type Bifacial
The Deep Blue 4.0 440W N-Type Bifacial delivers 440W, 20W more than the Deep Blue 3.0 420W PERC at 420W.
Deep Blue 4.0 440W N-Type Bifacial has a higher efficiency of 22.5% 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 Deep Blue 4.0 440W N-Type Bifacial uses N-type Bycium+ MBB Half-Cell.
On price, the Deep Blue 4.0 440W N-Type Bifacial is cheaper by £4.40.
Here's how they compare across all key specifications.
Spec
JA Solar
Deep Blue 3.0 420W PERC
420W
21% efficiency
JA Solar
Deep Blue 4.0 440W N-Type Bifacial
440W
22.5% efficiency
Full Specification Comparison
| Spec | Deep Blue 3.0 420W PERC | Deep Blue 4.0 440W N-Type Bifacial |
|---|---|---|
| Performance | ||
| Power Output | 420 W | 440 W |
| Efficiency | 21% | 22.5% |
| Cell Type | Mono PERC MBB Half-Cell | N-type Bycium+ MBB Half-Cell |
| Temp. Coeff. | — | -0.29 %/°C |
| Number of Cells | 108 | 108 |
| Bifacial | No | Yes |
| Electrical | ||
| Voc | — | 39.38 V |
| Vmp | 37.73 V | 33.37 V |
| Isc | — | 13.85 A |
| Imp | — | 13.18 A |
| Max System Voltage | 1000 V | 1500 V |
| Operating Temp | -40 to +85 °C | -40 to +85 °C |
| Physical | ||
| Dimensions | 1762x1134x30 mm | 1722x1134x30 mm |
| Weight | 20 kg | 21.5 kg |
| Frame Colour | Black | Black |
| Connector Type | MC4 | MC4-EVO2 |
| Junction Box IP | — | IP68 |
| Warranty & Certification | ||
| Product Warranty | 12 years | 12 years |
| Power Warranty | 25 years linear | 30 years linear |
| MCS Certified | Yes | Yes |
| Certifications | IEC 61215, IEC 61730 | IEC 61215, IEC 61730 |
| Pricing (UK) | ||
| Retail Price | £57.81 | £53.41 |
| Price per Watt | £0.138/W | £0.121/W |
Frequently Asked Questions
Which is more efficient, the Deep Blue 3.0 420W PERC or the Deep Blue 4.0 440W N-Type Bifacial?
The Deep Blue 4.0 440W N-Type Bifacial is more efficient at 22.5%, 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 Deep Blue 4.0 440W N-Type Bifacial?
The Deep Blue 4.0 440W N-Type Bifacial has a higher rated output at 440W. This means fewer panels would be needed to reach the same system size compared to the Deep Blue 3.0 420W PERC.
Is the Deep Blue 3.0 420W PERC or Deep Blue 4.0 440W N-Type Bifacial better value for money?
The Deep Blue 4.0 440W N-Type Bifacial is priced lower at £53.41 per panel, saving £4.40 per panel. However, value depends on the full system cost, efficiency, and warranty — use our solar cost calculator to compare total installation costs.
Which solar panel should I choose for my home — the Deep Blue 3.0 420W PERC or the Deep Blue 4.0 440W N-Type Bifacial?
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 →JA Solar
Deep Blue 4.0 440W N-Type Bifacial
440W · 22.5% efficiency · N-type Bycium+ MBB Half-Cell
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.