The Anker SOLIX PS400 Bifacial Portable Solar Panel is the better portable solar panel overall, rated 4.3 to 4.2. The Anker SOLIX PS400 Bifacial Portable Solar Panel leads on durability, features and efficiency. The TWELSEAVAN 400W Portable Solar Panel wins on value. The TWELSEAVAN 400W Portable Solar Panel costs $199.99 less ($399.99 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 400 W folding panel for owners of large power stations that accept around 50 V of solar input. Small-station owners need a lower-voltage panel.
Amazon $399.99Prices 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 | TWELSEAVAN 400W Portable Solar Panel |
|---|---|---|
| Overall rating | 4.3/5 | 4.2/5 |
| Value 30% | 57 $1.50 per rated watt | 86 $1.00 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)) | 97 17.6 W per lb (22.7 lb (10.3 kg)) |
| Durability 15% | 100 IP68, 5-year warranty | 56 IP65, 2-year warranty |
| Efficiency 10% | 100 25% claimed efficiency | 83 24% claimed efficiency |
| Features 10% | 60 built-in kickstand, bifacial | 35 built-in kickstand |
| Anker SOLIX PS400 Bifacial Portable Solar Panel | TWELSEAVAN 400W Portable Solar Panel | |
|---|---|---|
| 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) | 24% (cell efficiency per the Amazon listing) |
| Cells | - | Monocrystalline |
| Bifacial | Yes | No |
| Electrical | ||
| Open-circuit voltage (Voc) | - | 46.9 V |
| Voltage at max power (Vmp) | 48 V | 40 V |
| Short-circuit current (Isc) | - | 10.6 A |
| Current at max power (Imp) | 8.3 A | 10 A |
| 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 | 9.8 ft 5-in-1 MC4 cable (Anderson, XT60, DC8020, DC7909, DC5521), 3 DC adapters |
| Build | ||
| Weight | 21.9 lb (9.9 kg) | 22.7 lb (10.3 kg) |
| Folded size | 22.3 x 38.7 x 3.2 in | 26 x 35.5 in |
| Unfolded size | 90.2 x 38.7 x 0.7 in | 35.5 x 98.5 in |
| Kickstand | Yes | Yes |
| Water resistance | IP68 | IP65 |
| Warranty | 5 years | 2 years |
