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 and the Renogy 400W N-Type Portable Solar Panel Blanket are evenly matched, rated 4.2 and 4.2. The TWELSEAVAN 400W Portable Solar Panel leads on value and features. The Renogy 400W N-Type Portable Solar Panel Blanket wins on efficiency. The TWELSEAVAN 400W Portable Solar Panel costs $70 less ($399.99 vs $469.99).
Renogy 400W N-Type Portable Solar Panel Blanket
#7 in LargeFull review
For 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 $469.99$469.99
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 value ($1.00 per rated watt vs $1.17 per rated watt) and features (built-in kickstand vs series/parallel).
- Choose the Renogy 400W N-Type Portable Solar Panel Blanket for efficiency (25% claimed efficiency vs 24% claimed efficiency).
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 | Renogy 400W N-Type Portable Solar Panel Blanket |
|---|---|---|
| Overall rating | 4.2/5 | 4.2/5 |
| Value 30% | 86 $1.00 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% | 97 17.6 W per lb (22.7 lb (10.3 kg)) | 100 24.9 W per lb (16.1 lb (7.3 kg)) |
| Durability 15% | 56 IP65, 2-year warranty | 56 IP65, 2-year warranty |
| Efficiency 10% | 83 24% claimed efficiency | 100 25% claimed efficiency |
| Features 10% | 35 built-in kickstand | 20 series/parallel |
Specifications
| TWELSEAVAN 400W Portable Solar Panel | 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 | 24% (cell efficiency per the Amazon listing) | 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) | 46.9 V | 39.2 V |
| Voltage at max power (Vmp) | 40 V | 33.6 V |
| Short-circuit current (Isc) | 10.6 A | 13.1 A |
| Current at max power (Imp) | 10 A | 11.9 A |
| Series / parallel | - | Yes |
| Connections | ||
| Output connector | MC4 | MC4 |
| Cables included | 9.8 ft 5-in-1 MC4 cable (Anderson, XT60, DC8020, DC7909, DC5521), 3 DC adapters | - |
| USB ports | - | None |
| Build | ||
| Weight | 22.7 lb (10.3 kg) | 16.1 lb (7.3 kg) |
| Folded size | 26 x 35.5 in | 16.54 x 15.83 x 4.13 in |
| Unfolded size | 35.5 x 98.5 in | 64.96 x 62.99 x 1.50 in |
| Kickstand | Yes | - |
| Water resistance | IP65 | IP65 |
| Warranty | 2 years | 2 years |