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.
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.
The most power independent reviewers measured from the panel in real sun. Heat, haze, sun angle and the device being charged all cut output, so 70-85% of the rated watts is a normal real-world result.
| 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 |
| Output | |
|---|---|
| Rated power | 400 W |
| Tested output | 364 W (91%) |
| Efficiency | 23% ("up to"; the listing calls it conversion efficiency without saying cell or module) |
| Cells | Monocrystalline (10BB, Grade A cells) |
| Bifacial | Yes |
| Connections | |
| Output connector | MC4 |
| Build | |
| Dimensions | 53.7 x 30.3 x 1.18 in (each panel) |
| Frame | black aluminum |
| Glass | tempered |
| Junction box rating | IP65 |
A well-documented 200 W panel for a 12 V RV, boat or cabin system from an established brand. Buyers chasing the lowest price per watt can find 200 W for much less.
Amazon $189.99 Rich Solar $239.99A 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 $365.99 Renogy $352.99A 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 $179.99More from JJN: every JJN product ranked.
