The Silfab Prime NTC 440 is the better rigid solar panel overall, rated 4.5 to 4.0. The Silfab Prime NTC 440 leads on durability and efficiency. The Silfab Prime NTC 440 costs $23.99 less ($245.99 vs $269.98).
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 $279.32A 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 $269.98Prices 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.
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 | Silfab Prime NTC 440 | LIVOSUN 435W Bifacial |
|---|---|---|
| Overall rating | 4.5/5 | 4.0/5 |
| Value 45% | 90 $0.56 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, 12-year warranty | 60 no IP rating, 10-year warranty |
| Efficiency 15% | 92 22.6% module efficiency | 80 22% module efficiency (from size and rated power) |
| Silfab Prime NTC 440 | LIVOSUN 435W Bifacial | |
|---|---|---|
| Output | ||
| Rated power | 440 W | 435 W |
| Module efficiency | 22.6% | 22% (rated power over panel area) |
| Claimed efficiency | 22.6% (module efficiency) | - |
| Cells | Monocrystalline (N-type (NTC passivated rear), 108 half cells) | Monocrystalline (N-type) |
| Bifacial | No | Yes |
| Electrical | ||
| Open-circuit voltage (Voc) | 39 V | 37.3 V |
| Voltage at max power (Vmp) | 33.4 V | 31.6 V |
| Short-circuit current (Isc) | 14.2 A | - |
| Current at max power (Imp) | 13.2 A | 13.8 A |
| Voc temperature coefficient | -0.2%/°C | - |
| Series / parallel | Yes | - |
| Connections | ||
| Output connector | Stäubli MC4 | MC4 |
| Build | ||
| Weight | 46.3 lb (21 kg) | - |
| Dimensions | 67.8 x 44.6 x 1.37 in | 68 x 45 x 1.5 in |
| Frame | black anodized aluminum | aluminum |
| Glass | 3.2 mm high-transmittance tempered, anti-reflective coating | tempered |
| Junction box rating | IP68 | - |
| Warranty | 12 years | 10 years |
| Output warranty | 30 years: at least 98% after year 1, 94.7% at 12 years, 90.8% at 25 years and 89.3% at 30 years | "over 30 years" power output warranty; no percentage given |
| Released | 2023-09 | - |
