Maxeon 3 415 Black
#6 in 150 W and upFull review
A premium all-black rooftop panel at a budget price for a home system bought as a full set, with slow aging that pays off over decades.
Signature Solar $141.10 Solar Cellz USA $324$141.10
The Maxeon 3 415 Black is the better rigid solar panel overall, rated 4.6 to 4.0. The Maxeon 3 415 Black leads on value and efficiency. The Maxeon 3 415 Black costs $158.87 less ($141.10 vs $299.97).
Callsun 420W (2 x 210W) Bifacial 2-Pack
#27 in 150 W and upFull review
A good-value pair for a 24 V RV, van or cabin system with an MPPT controller, or for a power station wired in parallel. Owners of 12 V PWM setups should pick a lower-voltage panel.
Amazon $299.97$299.97
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 Maxeon 3 415 Black for value ($0.34 per rated watt vs $0.71 per rated watt) and efficiency (21.9% module efficiency vs 19.9% 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 | Maxeon 3 415 Black | Callsun 420W (2 x 210W) Bifacial 2-Pack |
|---|---|---|
| Overall rating | 4.6/5 | 4.0/5 |
| Value 45% | 100 $0.34 per rated watt | 75 $0.71 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, 10-year warranty |
| Efficiency 15% | 78 21.9% module efficiency | 38 19.9% module efficiency (from size and rated power) |
Specifications
| Maxeon 3 415 Black | Callsun 420W (2 x 210W) Bifacial 2-Pack | |
|---|---|---|
| Output | ||
| Rated power | 415 W | 420 W |
| Module efficiency | 21.9% | 19.9% (rated power over panel area) |
| Claimed efficiency | 21.9% (module efficiency of the 415 W version, from the datasheet (the 420 W version is 22.2%)) | 25.6% (cell efficiency; no module efficiency published) |
| Cells | Monocrystalline (112 Maxeon Gen 3 back-contact cells) | Monocrystalline (N-type, 16BB, quarter-cut cells, wired as two parallel halves for shade tolerance) |
| Bifacial | No | Yes |
| Electrical | ||
| Open-circuit voltage (Voc) | 40.7 V | 40.3 V |
| Voltage at max power (Vmp) | 35.3 V | 34.2 V |
| Short-circuit current (Isc) | 12.6 A | 6.5 A |
| Current at max power (Imp) | 11.8 A | 6.1 A |
| Voc temperature coefficient | -0.2%/°C | -0.2%/°C |
| Series / parallel | Yes | Yes |
| Connections | ||
| Output connector | Stäubli MC4 | Solar connectors |
| Build | ||
| Weight | 46.7 lb (21.2 kg) | - |
| Dimensions | 71.34 x 41.18 x 1.57 in | 54.2 x 30.2 x 1.4 in (each panel) |
| Frame | Class 1 black anodized aluminum | anodized aluminum alloy |
| Glass | high-transmission tempered, anti-reflective | 3.2 mm tempered |
| Junction box rating | IP68 | IP68 |
| Warranty | 25 years | 10 years |
| Output warranty | 25 years standard (40 with a Maxeon-partner install): at least 98% in year 1, then no more than 0.25% loss a year | 84.5% output after 25 years |
| Released | - | 2026-08 |