The JJN 400W (2 x 200W) Bifacial 10BB 2-Pack and the DOKIO 400W Rigid are evenly matched, rated 3.8 and 3.8. The JJN 400W (2 x 200W) Bifacial 10BB 2-Pack leads on value. The DOKIO 400W Rigid wins on efficiency. The JJN 400W (2 x 200W) Bifacial 10BB 2-Pack costs $38.78 less ($215.99 vs $254.77).
A cheap, independently tested 400 W pair for a van, RV or shed on a budget. JJN’s newer N-type 2-pack costs a little more but comes with a full spec sheet and a stated warranty.
Amazon $215.99A 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 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 | JJN 400W (2 x 200W) Bifacial 10BB 2-Pack | DOKIO 400W Rigid |
|---|---|---|
| Overall rating | 3.8/5 | 3.8/5 |
| Value 45% | 91 $0.54 per rated watt | 82 $0.64 per rated watt |
| Tested output 15% | 100 best measured 91% of rated watts (1 test) | 50 not yet independently tested (neutral score used) |
| Durability 25% | 24 IP65 | 50 IP rating and warranty not published (neutral score used) |
| Efficiency 15% | 22 19.1% module efficiency (from size and rated power) | 50 20.5% module efficiency (from size and rated power) |
| Tested by | Measured peak | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | - | 91% | 182 W from one 200 W panel of this model (sold singly as B09VS7PR2J); peak_w left null because the pack is rated 400 W. Sunny California day at 6,500 ft |
No independent test published yet.
| JJN 400W (2 x 200W) Bifacial 10BB 2-Pack | DOKIO 400W Rigid | |
|---|---|---|
| Output | ||
| Rated power | 400 W | 400 W |
| Tested output | 364 W (91%) | - |
| Module efficiency | 19.1% (rated power over panel area) | 20.5% (rated power over panel area) |
| Claimed efficiency | 23% ("up to"; the listing calls it conversion efficiency without saying cell or module) | - |
| Cells | Monocrystalline (10BB, Grade A cells) | Monocrystalline |
| Bifacial | Yes | No |
| Electrical | ||
| Open-circuit voltage (Voc) | - | 37.1 V |
| Voltage at max power (Vmp) | - | 31 V |
| Short-circuit current (Isc) | - | 13.2 A |
| Series / parallel | - | Yes |
| Connections | ||
| Output connector | MC4 | MC4 |
| Build | ||
| Weight | - | 49.4 lb (22.4 kg) |
| Dimensions | 53.7 x 30.3 x 1.18 in (each panel) | 67.8 x 44.6 x 1.2 in |
| Frame | black aluminum | aluminum |
| Glass | tempered | tempered |
| Junction box rating | IP65 | - |
| Released | 2026-07 | - |
