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 4.0. The JA Solar DeepBlue 4.0 440W Bifacial leads on durability, value and efficiency. The JA Solar DeepBlue 4.0 440W Bifacial costs $80.98 less ($189 vs $269.98).
LIVOSUN 435W Bifacial
#26 in 150 W and upFull review
A low-cost large bifacial panel for a home rooftop, shed or ground-mount array on a 24 V or 48 V system with an MPPT controller. Buy it for the price, not the paperwork, since the seller publishes very few specs.
Amazon $269.98$269.98
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 durability (IP68, 25-year warranty vs no IP rating, 10-year warranty), value ($0.43 per rated watt vs $0.62 per rated watt) and efficiency (22.5% module efficiency vs 22% module efficiency (from size and rated power)).
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 | LIVOSUN 435W Bifacial |
|---|---|---|
| Overall rating | 4.7/5 | 4.0/5 |
| Value 45% | 100 $0.43 per rated watt | 84 $0.62 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 | 60 no IP rating, 10-year warranty |
| Efficiency 15% | 90 22.5% module efficiency | 80 22% module efficiency (from size and rated power) |
Specifications
| JA Solar DeepBlue 4.0 440W Bifacial | LIVOSUN 435W Bifacial | |
|---|---|---|
| Output | ||
| Rated power | 440 W | 435 W |
| Module efficiency | 22.5% | 22% (rated power over panel area) |
| Claimed efficiency | 22.5% (module efficiency of the 440 W version, from the datasheet (JA quotes up to 26% for the cells alone)) | - |
| Cells | Monocrystalline (N-type Bycium+ TOPCon, 108 half-cut bifacial cells, 16 busbars) | Monocrystalline (N-type) |
| Bifacial | Yes | Yes |
| Electrical | ||
| Open-circuit voltage (Voc) | 39.4 V | 37.3 V |
| Voltage at max power (Vmp) | 33.4 V | 31.6 V |
| Short-circuit current (Isc) | 13.8 A | - |
| Current at max power (Imp) | 13.2 A | 13.8 A |
| Voc temperature coefficient | -0.2%/°C | - |
| Series / parallel | Yes | - |
| Connections | ||
| Output connector | QC 4.10-351 or MC4-EVO2 | MC4 |
| Build | ||
| Weight | 47.4 lb (21.5 kg) | - |
| Dimensions | 67.8 x 44.6 x 1.18 in | 68 x 45 x 1.5 in |
| Frame | black, 30 mm deep | aluminum |
| Glass | 1.6 mm front and rear (dual glass) | tempered |
| Junction box rating | IP68 | - |
| Warranty | 25 years | 10 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) | "over 30 years" power output warranty; no percentage given |