The Anker SOLIX PS400 Bifacial Portable Solar Panel and the Greenmagic 400W Portable Foldable Solar Panel (GM400B) are evenly matched, rated 4.3 and 4.3. The Anker SOLIX PS400 Bifacial Portable Solar Panel leads on durability and efficiency. The Greenmagic 400W Portable Foldable Solar Panel (GM400B) wins on value. The Greenmagic 400W Portable Foldable Solar Panel (GM400B) costs $276.99 less ($322.99 vs $599.98).
For owners of large power stations who want 400 W from a single panel they can still carry. It is much lighter than older 400 W folding panels.
Amazon $599.98 Anker SOLIX $699.99A 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 $322.99Prices 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 | Anker SOLIX PS400 Bifacial Portable Solar Panel | Greenmagic 400W Portable Foldable Solar Panel (GM400B) |
|---|---|---|
| Overall rating | 4.3/5 | 4.3/5 |
| Value 30% | 57 $1.50 per rated watt | 97 $0.81 per rated watt |
| Tested output 20% | 89 not yet tested; estimated 87% of rated watts from the median of the 10 tested panels | 89 not yet tested; estimated 87% of rated watts from the median of the 10 tested panels |
| Portability 15% | 100 18.3 W per lb (21.9 lb (9.9 kg)) | 100 18.6 W per lb (21.5 lb (9.8 kg)) |
| Durability 15% | 100 IP68, 5-year warranty | 36 IP65 |
| Efficiency 10% | 100 25% claimed efficiency | 75 23.5% claimed efficiency |
| Features 10% | 60 built-in kickstand, bifacial | 55 built-in kickstand, series/parallel |
| Anker SOLIX PS400 Bifacial Portable Solar Panel | Greenmagic 400W Portable Foldable Solar Panel (GM400B) | |
|---|---|---|
| Output | ||
| Rated power | 400 W | 400 W |
| Tested output | Not tested (estimated 87%) | Not tested (estimated 87%) |
| Efficiency | 25% ("25%+ conversion efficiency" per Anker; cell vs module not stated) | 23.5% (the listing gives a 21.5-23.5% range without saying cell or module; the top of the range is recorded) |
| Cells | - | Monocrystalline |
| Bifacial | Yes | No |
| Electrical | ||
| Voltage at max power (Vmp) | 48 V | - |
| Current at max power (Imp) | 8.3 A | - |
| Series / parallel | - | Yes |
| Connections | ||
| Output connector | - | MC4 |
| Cables included | 2x 8.2 ft (2.5 m) solar charging cable, 1.6 ft (0.5 m) XT-60i solar charging cable | - |
| USB ports | - | None |
| Build | ||
| Weight | 21.9 lb (9.9 kg) | 21.5 lb (9.8 kg) |
| Folded size | 22.3 x 38.7 x 3.2 in | 32.09 x 31.30 x 1.97 in |
| Unfolded size | 90.2 x 38.7 x 0.7 in | - |
| Kickstand | Yes | Yes |
| Water resistance | IP68 | IP65 |
| Warranty | 5 years | - |
