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 and the Mission Solar MSX10 435 are evenly matched, rated 4.7 and 4.6. The JA Solar DeepBlue 4.0 440W Bifacial costs $11.47 less ($189 vs $200.47).
Mission Solar MSX10 435
#5 in 150 W and upFull review
A US-built all-black rooftop panel at an import-like price, for homeowners or installers who want domestic content without paying a premium.
A1 Solar Store $200.47 The Solar Store $219 US Solar Supplier $224.99$200.47
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.
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 | Mission Solar MSX10 435 |
|---|---|---|
| Overall rating | 4.7/5 | 4.6/5 |
| Value 45% | 100 $0.43 per rated watt | 99 $0.46 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, 25-year warranty |
| Efficiency 15% | 90 22.5% module efficiency | 86 22.3% module efficiency |
Specifications
| JA Solar DeepBlue 4.0 440W Bifacial | Mission Solar MSX10 435 | |
|---|---|---|
| Output | ||
| Rated power | 440 W | 435 W |
| Module efficiency | 22.5% | 22.3% |
| Claimed efficiency | 22.5% (module efficiency of the 440 W version, from the datasheet (JA quotes up to 26% for the cells alone)) | 23% ("up to 23% efficiency" for the series; the 435 W version's module efficiency is 22.3%) |
| Cells | Monocrystalline (N-type Bycium+ TOPCon, 108 half-cut bifacial cells, 16 busbars) | Monocrystalline (N-type TOPCon, 108 half cells) |
| Bifacial | Yes | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 39.4 V | 39.6 V |
| Voltage at max power (Vmp) | 33.4 V | 33.3 V |
| Short-circuit current (Isc) | 13.8 A | 13.8 A |
| Current at max power (Imp) | 13.2 A | 13.1 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) | 47 lb (21.3 kg) |
| Dimensions | 67.8 x 44.6 x 1.18 in | 1722 x 1134 x 35 mm |
| Frame | black, 30 mm deep | 35 mm black anodized aluminum |
| Glass | 1.6 mm front and rear (dual glass) | 3.2 mm AR-coated tempered |
| Junction box rating | IP68 | IP68 |
| Warranty | 25 years | 25 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 99% after year 1, 94.05% at 12 years, 88.2% at 25 years and 86% at 30 years |