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 4.2. The TWELSEAVAN 400W Portable Solar Panel leads on portability, value and efficiency. The Renogy 400W Lightweight Portable Solar Suitcase (RSP400LSC) wins on durability and features. The TWELSEAVAN 400W Portable Solar Panel costs $96 less ($399.99 vs $495.99).
Renogy 400W Lightweight Portable Solar Suitcase (RSP400LSC)
#8 in LargeFull review
For 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 $495.99$495.99
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 portability (17.6 W per lb (22.7 lb (10.3 kg)) vs 13.2 W per lb (30.2 lb (13.7 kg))), value ($1.00 per rated watt vs $1.24 per rated watt) and efficiency (24% claimed efficiency vs 23% claimed efficiency).
- Choose the Renogy 400W Lightweight Portable Solar Suitcase (RSP400LSC) for durability (IP67, 3-year warranty vs IP65, 2-year warranty) and features (built-in kickstand, series/parallel vs built-in kickstand).
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 Lightweight Portable Solar Suitcase (RSP400LSC) |
|---|---|---|
| Overall rating | 4.2/5 | 4.2/5 |
| Value 30% | 86 $1.00 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% | 97 17.6 W per lb (22.7 lb (10.3 kg)) | 60 13.2 W per lb (30.2 lb (13.7 kg)) |
| Durability 15% | 56 IP65, 2-year warranty | 100 IP67, 3-year warranty |
| Efficiency 10% | 83 24% claimed efficiency | 67 23% claimed efficiency |
| Features 10% | 35 built-in kickstand | 55 built-in kickstand, series/parallel |
Specifications
| TWELSEAVAN 400W Portable Solar Panel | 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 | 24% (cell efficiency per the Amazon listing) | 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) | 46.9 V | 47.2 V |
| Voltage at max power (Vmp) | 40 V | 40 V |
| Short-circuit current (Isc) | 10.6 A | 11 A |
| Current at max power (Imp) | 10 A | 10 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) | 30.2 lb (13.7 kg) |
| Folded size | 26 x 35.5 in | 27.9 x 33.7 x 3.2 in (708 x 855 x 80 mm) |
| Unfolded size | 35.5 x 98.5 in | 111.8 x 33.7 x 0.8 in (2838 x 855 x 20 mm) |
| Kickstand | Yes | Yes |
| Water resistance | IP65 | IP67 |
| Warranty | 2 years | 3 years |