The Greenmagic 400W Portable Foldable Solar Panel (GM400B) is the better portable solar panel overall, rated 4.3 to 4.2. The Greenmagic 400W Portable Foldable Solar Panel (GM400B) leads on value and features. The Renogy 400W N-Type Portable Solar Panel Blanket wins on durability and efficiency. The Greenmagic 400W Portable Foldable Solar Panel (GM400B) costs $147 less ($322.99 vs $469.99).
A low-cost 400 W folding panel for owners of large power stations who camp by the car or RV. The thin spec sheet means checking a station’s voltage limit before buying.
Amazon $322.99For van, truck and SUV campers who want 400 W from something that stows like a backpack. Owners of small power stations should check the voltage limit, and anyone who wants to prop a panel up on legs should look at a folding suitcase panel instead.
Amazon $469.99 Renogy $469.99Prices 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 large portable solar panel; a clear win is highlighted. How we rank explains each one.
| Factor weight | Greenmagic 400W Portable Foldable Solar Panel (GM400B) | Renogy 400W N-Type Portable Solar Panel Blanket |
|---|---|---|
| Overall rating | 4.3/5 | 4.2/5 |
| Value 30% | 97 $0.81 per rated watt | 76 $1.17 per rated watt |
| Tested output 20% | 89 not yet tested; estimated 87% of rated watts from the median of the 10 tested panels | 91 not yet tested; estimated 87% of rated watts from 1 test of Renogy panels and the median of the 10 tested panels |
| Portability 15% | 100 18.6 W per lb (21.5 lb (9.8 kg)) | 100 24.9 W per lb (16.1 lb (7.3 kg)) |
| Durability 15% | 36 IP65 | 56 IP65, 2-year warranty |
| Efficiency 10% | 75 23.5% claimed efficiency | 100 25% claimed efficiency |
| Features 10% | 55 built-in kickstand, series/parallel | 20 series/parallel |
| Greenmagic 400W Portable Foldable Solar Panel (GM400B) | Renogy 400W N-Type Portable Solar Panel Blanket | |
|---|---|---|
| Output | ||
| Rated power | 400 W | 400 W |
| Tested output | Not tested (estimated 87%) | Not tested (estimated 87%) |
| Efficiency | 23.5% (the listing gives a 21.5-23.5% range without saying cell or module; the top of the range is recorded) | 25% (cell efficiency as quoted by Renogy and on the Amazon listing; the manual gives no efficiency figure) |
| Cells | Monocrystalline | Monocrystalline (N-type, 16BB) |
| Bifacial | No | No |
| Electrical | ||
| Open-circuit voltage (Voc) | - | 39.2 V |
| Voltage at max power (Vmp) | - | 33.6 V |
| Short-circuit current (Isc) | - | 13.1 A |
| Current at max power (Imp) | - | 11.9 A |
| Series / parallel | Yes | Yes |
| Connections | ||
| Output connector | MC4 | MC4 |
| USB ports | None | None |
| Build | ||
| Weight | 21.5 lb (9.8 kg) | 16.1 lb (7.3 kg) |
| Folded size | 32.09 x 31.30 x 1.97 in | 16.54 x 15.83 x 4.13 in |
| Unfolded size | - | 64.96 x 62.99 x 1.50 in |
| Kickstand | Yes | - |
| Water resistance | IP65 | IP65 |
| Warranty | - | 2 years |
