The JJN 400W (2 x 200W) N-Type 16BB Bifacial Rigid Solar Panel 2-Pack is the better rigid solar panel overall, rated 4.1 to 3.8. The DOKIO 400W 31V Monocrystalline Rigid Solar Panel costs $5.22 less ($254.77 vs $259.99).
Two of JJN’s N-type 200 W bifacial panels for a van, RV or shed system with an MPPT controller or a power station. Slightly cheaper per watt than buying the single panel twice.
Amazon $259.99 JJN $265A low-cost large panel for a shed, greenhouse or ground mount with an MPPT controller. Buyers who want a stated warranty and full spec sheet should pay a little more for a better-documented brand.
Amazon $254.77Prices were last checked October 21, 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 | JJN 400W (2 x 200W) N-Type 16BB Bifacial Rigid Solar Panel 2-Pack | DOKIO 400W 31V Monocrystalline Rigid Solar Panel |
|---|---|---|
| Overall rating | 4.1/5 | 3.8/5 |
| Value 45% | 81 $0.65 per rated watt | 82 $0.64 per rated watt |
| Tested output 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Durability 25% | 67 IP68, 5-year warranty | 50 IP rating and warranty not published (neutral score used) |
| Efficiency 15% | 100 25% claimed efficiency | 50 efficiency not published (neutral score used) |
| JJN 400W (2 x 200W) N-Type 16BB Bifacial Rigid Solar Panel 2-Pack | DOKIO 400W 31V Monocrystalline Rigid Solar Panel | |
|---|---|---|
| Output | ||
| Rated power | 400 W | 400 W |
| Efficiency | 25% (published as "25+%"; the maker does not say whether this is cell or module efficiency) | - |
| Cells | Monocrystalline (N-type, 16BB, triple-cut cells, Grade A+) | Monocrystalline |
| Bifacial | Yes | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 28.1 V | 37.1 V |
| Voltage at max power (Vmp) | 23.4 V | 31 V |
| Short-circuit current (Isc) | 9.1 A | 13.2 A |
| Current at max power (Imp) | 8.6 A | - |
| Series / parallel | - | Yes |
| Connections | ||
| Output connector | MC4 | MC4 |
| Build | ||
| Weight | - | 49.4 lb (22.4 kg) |
| Dimensions | 53.7 x 30 x 1.2 in (each panel) | 67.8 x 44.6 x 1.2 in |
| Frame | black anodized aluminum | aluminum |
| Glass | tempered front, transparent backsheet | tempered |
| Junction box rating | IP68 | - |
| Warranty | 5 years | - |
| Output warranty | 30-year performance warranty, 88.9% output | - |
