TWELSEAVAN 400W Portable Solar Panel
#6 in LargeFull review
A 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 $399.99$399.99
The TWELSEAVAN 400W Portable Solar Panel is the better portable solar panel overall, rated 4.2 to 4.0. The TWELSEAVAN 400W Portable Solar Panel leads on durability and efficiency. The CTOLITY 400W Portable Solar Panel (400W-NEW) wins on value. The CTOLITY 400W Portable Solar Panel (400W-NEW) costs $110 less ($289.99 vs $399.99).
CTOLITY 400W Portable Solar Panel (400W-NEW)
#10 in LargeFull review
A low-priced 400 W folding panel, but its listing is too thin and inconsistent to recommend over better-documented panels until CTOLITY publishes full specs.
Amazon $289.99$289.99
Prices 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.
Which should you buy?
- Choose the TWELSEAVAN 400W Portable Solar Panel for durability (IP65, 2-year warranty vs IP65) and efficiency (24% claimed efficiency vs 23.4% claimed efficiency).
- Choose the CTOLITY 400W Portable Solar Panel (400W-NEW) for value ($0.72 per rated watt vs $1.00 per rated watt).
Scores side by side
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 | TWELSEAVAN 400W Portable Solar Panel | CTOLITY 400W Portable Solar Panel (400W-NEW) |
|---|---|---|
| Overall rating | 4.2/5 | 4.0/5 |
| Value 30% | 86 $1.00 per rated watt | 100 $0.72 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% | 97 17.6 W per lb (22.7 lb (10.3 kg)) | 50 weight not published (neutral score used) |
| Durability 15% | 56 IP65, 2-year warranty | 36 IP65 |
| Efficiency 10% | 83 24% claimed efficiency | 73 23.4% claimed efficiency |
| Features 10% | 35 built-in kickstand | 35 built-in kickstand |
Specifications
| TWELSEAVAN 400W Portable Solar Panel | CTOLITY 400W Portable Solar Panel (400W-NEW) | |
|---|---|---|
| Output | ||
| Rated power | 400 W | 400 W |
| Tested output | Not tested (estimated 87%) | Not tested (estimated 87%) |
| Efficiency | 24% (cell efficiency per the Amazon listing) | 23.4% (conversion efficiency from the Amazon listing's description, not stated as cell or module; the listing title says 23%) |
| Cells | Monocrystalline | Monocrystalline |
| Bifacial | No | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 46.9 V | - |
| Voltage at max power (Vmp) | 40 V | - |
| Short-circuit current (Isc) | 10.6 A | - |
| Current at max power (Imp) | 10 A | - |
| Connections | ||
| Output connector | MC4 | MC4 |
| Cables included | 9.8 ft 5-in-1 MC4 cable (Anderson, XT60, DC8020, DC7909, DC5521), 3 DC adapters | - |
| Build | ||
| Weight | 22.7 lb (10.3 kg) | - |
| Folded size | 26 x 35.5 in | - |
| Unfolded size | 35.5 x 98.5 in | - |
| Kickstand | Yes | Yes |
| Water resistance | IP65 | IP65 |
| Warranty | 2 years | - |