The DOKIO 400W Rigid and the Renogy 400W (2 x 200W) 2-Pack are evenly matched, rated 3.8 and 3.7. The DOKIO 400W Rigid leads on value. The DOKIO 400W Rigid costs $98.22 less ($254.77 vs $352.99).
A 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 $254.77A simple way to buy 400 W of Renogy’s 200 W panel for an RV roof, shed or ground mount with an MPPT controller. Compare it with two singles first, since the pack is not always cheaper.
Amazon $352.99Prices were last checked October 29, 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 | DOKIO 400W Rigid | Renogy 400W (2 x 200W) 2-Pack |
|---|---|---|
| Overall rating | 3.8/5 | 3.7/5 |
| Value 45% | 82 $0.64 per rated watt | 59 $0.88 per rated watt |
| Tested output 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Durability 25% | 50 IP rating and warranty not published (neutral score used) | 84 IP65, 10-year warranty |
| Efficiency 15% | 50 20.5% module efficiency (from size and rated power) | 54 20.7% module efficiency (from size and rated power) |
| DOKIO 400W Rigid | Renogy 400W (2 x 200W) 2-Pack | |
|---|---|---|
| Output | ||
| Rated power | 400 W | 400 W |
| Module efficiency | 20.5% (rated power over panel area) | 20.7% (rated power over panel area) |
| Claimed efficiency | - | 25% (cell efficiency; datasheet module efficiency 20.7%) |
| Cells | Monocrystalline | Monocrystalline (N-type, 16BB) |
| Bifacial | No | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 37.1 V | 37.4 V |
| Voltage at max power (Vmp) | 31 V | 31 V |
| Short-circuit current (Isc) | 13.2 A | 6.8 A |
| Current at max power (Imp) | - | 6.5 A |
| Voc temperature coefficient | - | -0.3%/°C |
| Series / parallel | Yes | Yes |
| Connections | ||
| Output connector | MC4 | Solar connectors (IP67) |
| Build | ||
| Weight | 49.4 lb (22.4 kg) | - |
| Dimensions | 67.8 x 44.6 x 1.2 in | 49.7 x 30.1 x 1.2 in (each panel) |
| Frame | aluminum | anodized aluminum alloy |
| Glass | tempered | 3.2 mm tempered |
| Junction box rating | - | IP65 |
| Warranty | - | 10 years |
| Output warranty | - | 95% output for 5 years, 90% for 10 years, 80% for 25 years |
| Released | - | 2025-08 |
