JA Solar DeepBlue 4.0 440W Bifacial
#2 in 150 W and upFull review
A well-priced all-black bifacial rooftop panel from a top-tier maker for a home grid-tie system bought as a full set.
US Solar Supplier $189$189
The JA Solar DeepBlue 4.0 440W Bifacial is the better rigid solar panel overall, rated 4.7 to 4.5. The JA Solar DeepBlue 4.0 440W Bifacial leads on value. The JA Solar DeepBlue 4.0 440W Bifacial costs $56.99 less ($189 vs $245.99).
Silfab Prime NTC 440
#10 in 150 W and upFull review
A North American-made all-black rooftop panel for homeowners or installers who want domestic supply and a strong 30-year output warranty. Register it to get the full 25-year product warranty.
SolarTown $245.99 Solar Cellz USA $279.32$245.99
Prices were last checked October 26, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the JA Solar DeepBlue 4.0 440W Bifacial for value ($0.43 per rated watt vs $0.56 per rated watt).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 150 W and up rigid solar panel; a clear win is highlighted. How we rank explains each one.
| Factor weight | JA Solar DeepBlue 4.0 440W Bifacial | Silfab Prime NTC 440 |
|---|---|---|
| Overall rating | 4.7/5 | 4.5/5 |
| Value 45% | 100 $0.43 per rated watt | 90 $0.56 per rated watt |
| Tested output 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Durability 25% | 100 IP68, 25-year warranty | 100 IP68, 12-year warranty |
| Efficiency 15% | 90 22.5% module efficiency | 92 22.6% module efficiency |
Specifications
| JA Solar DeepBlue 4.0 440W Bifacial | Silfab Prime NTC 440 | |
|---|---|---|
| Output | ||
| Rated power | 440 W | 440 W |
| Module efficiency | 22.5% | 22.6% |
| Claimed efficiency | 22.5% (module efficiency of the 440 W version, from the datasheet (JA quotes up to 26% for the cells alone)) | 22.6% (module efficiency) |
| Cells | Monocrystalline (N-type Bycium+ TOPCon, 108 half-cut bifacial cells, 16 busbars) | Monocrystalline (N-type (NTC passivated rear), 108 half cells) |
| Bifacial | Yes | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 39.4 V | 39 V |
| Voltage at max power (Vmp) | 33.4 V | 33.4 V |
| Short-circuit current (Isc) | 13.8 A | 14.2 A |
| Current at max power (Imp) | 13.2 A | 13.2 A |
| Voc temperature coefficient | -0.2%/°C | -0.2%/°C |
| Series / parallel | Yes | Yes |
| Connections | ||
| Output connector | QC 4.10-351 or MC4-EVO2 | Stäubli MC4 |
| Build | ||
| Weight | 47.4 lb (21.5 kg) | 46.3 lb (21 kg) |
| Dimensions | 67.8 x 44.6 x 1.18 in | 67.8 x 44.6 x 1.37 in |
| Frame | black, 30 mm deep | black anodized aluminum |
| Glass | 1.6 mm front and rear (dual glass) | 3.2 mm high-transmittance tempered, anti-reflective coating |
| Junction box rating | IP68 | IP68 |
| Warranty | 25 years | 12 years |
| Output warranty | 30 years: no more than 1% loss in year 1, then no more than 0.4% a year (87.4% at 30 years) | 30 years: at least 98% after year 1, 94.7% at 12 years, 90.8% at 25 years and 89.3% at 30 years |
| Released | - | 2023-09 |