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.
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
| Output | |
|---|---|
| Rated power | 400 W |
| Cells | Monocrystalline |
| Bifacial | 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 |
| Build | |
| Weight | 49.4 lb (22.4 kg) |
| Dimensions | 67.8 x 44.6 x 1.2 in |
| Frame | aluminum |
| Glass | tempered |
A good single-panel choice for an RV roof, shed or ground mount where you want 200 W from one module. Pair it with an MPPT controller; on a 12 V system with a PWM controller, two 100 W panels make more sense.
Amazon $179.99 Renogy $179.99A low-cost, safety-certified 200 W panel for a 12 V RV, van or shed system. The thin warranty terms make Callsun or HQST the safer buy at similar prices.
Amazon $129.99For RV roofs and rooftops where vents, racks or trees shade part of the panel through the day. With clear sun all day, the cheaper standard Renogy 200 W does the same job.
Amazon $226.09 Renogy $239.99Compare the DOKIO 400W 31V Monocrystalline Rigid Solar Panel with any other rigid solar panel →
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