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, portability and efficiency. The Renogy 400W Lightweight Portable Solar Suitcase (RSP400LSC) wins on durability. The Greenmagic 400W Portable Foldable Solar Panel (GM400B) costs $173 less ($322.99 vs $495.99).
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 owners of large power stations who want 400 W from a single panel set up beside a car or RV. Check that your station’s solar input handles about 48 V first.
Amazon $495.99 Renogy $495.99Prices 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 Lightweight Portable Solar Suitcase (RSP400LSC) |
|---|---|---|
| Overall rating | 4.3/5 | 4.2/5 |
| Value 30% | 97 $0.81 per rated watt | 72 $1.24 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)) | 60 13.2 W per lb (30.2 lb (13.7 kg)) |
| Durability 15% | 36 IP65 | 100 IP67, 3-year warranty |
| Efficiency 10% | 75 23.5% claimed efficiency | 67 23% claimed efficiency |
| Features 10% | 55 built-in kickstand, series/parallel | 55 built-in kickstand, series/parallel |
| Greenmagic 400W Portable Foldable Solar Panel (GM400B) | Renogy 400W Lightweight Portable Solar Suitcase (RSP400LSC) | |
|---|---|---|
| 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) | 23% (cell efficiency per Renogy's product page and the Amazon listing; the product description elsewhere says 22.7%) |
| Cells | Monocrystalline | Monocrystalline |
| Bifacial | No | No |
| Electrical | ||
| Open-circuit voltage (Voc) | - | 47.2 V |
| Voltage at max power (Vmp) | - | 40 V |
| Short-circuit current (Isc) | - | 11 A |
| Current at max power (Imp) | - | 10 A |
| Series / parallel | Yes | Yes |
| Connections | ||
| Output connector | MC4 | MC4 |
| USB ports | None | None |
| Build | ||
| Weight | 21.5 lb (9.8 kg) | 30.2 lb (13.7 kg) |
| Folded size | 32.09 x 31.30 x 1.97 in | 27.9 x 33.7 x 3.2 in (708 x 855 x 80 mm) |
| Unfolded size | - | 111.8 x 33.7 x 0.8 in (2838 x 855 x 20 mm) |
| Kickstand | Yes | Yes |
| Water resistance | IP65 | IP67 |
| Warranty | - | 3 years |
