TWELSEAVAN 400W Portable
#4 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 is the better portable solar panel overall, rated 4.3 to 3.9. The TWELSEAVAN 400W Portable leads on value. The BLUETTI SORA 500 (500W) wins on efficiency. The TWELSEAVAN 400W Portable costs $449.01 less ($399.99 vs $849).
BLUETTI SORA 500 (500W)
#12 in LargeFull review
For owners of large BLUETTI or similar power stations who want maximum watts from one panel at a campsite or during an outage. The short warranty and high voltage rule it out for small stations.
Amazon $849 BLUETTI $849$849
Prices were last checked October 31, 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 for value ($1.00 per rated watt vs $1.70 per rated watt).
- Choose the BLUETTI SORA 500 (500W) 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 | BLUETTI SORA 500 (500W) |
|---|---|---|
| Overall rating | 4.3/5 | 3.9/5 |
| Value 30% | 86 $1.00 per rated watt | 46 $1.70 per rated watt |
| Tested output 20% | 92 not yet tested; estimated 88% of rated watts from the median of the 11 tested panels | 92 not yet tested; estimated 88% of rated watts from the median of the 11 tested panels |
| Portability 15% | 97 17.6 W per lb (22.7 lb (10.3 kg)) | 97 17.6 W per lb (28.4 lb (12.9 kg)) |
| Durability 15% | 56 IP65, 2-year warranty | 60 IP67, 1-year warranty |
| Efficiency 10% | 83 24% claimed efficiency | 100 25% claimed efficiency |
| Features 10% | 35 built-in kickstand | 35 built-in kickstand |
Specifications
| TWELSEAVAN 400W Portable | BLUETTI SORA 500 (500W) | |
|---|---|---|
| Output | ||
| Rated power | 400 W | 500 W |
| Tested output | Not tested (estimated 88%) | Not tested (estimated 88%) |
| Efficiency | 24% (cell efficiency per the Amazon listing) | 25% (up to 25%, as quoted by BLUETTI) |
| Cells | Monocrystalline | Monocrystalline (N-type) |
| Bifacial | No | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 46.9 V | 49.1 V |
| Voltage at max power (Vmp) | 40 V | 40.9 V |
| Short-circuit current (Isc) | 10.6 A | 13.3 A |
| Current at max power (Imp) | 10 A | 10.2 A |
| Connections | ||
| Output connector | MC4 | MC4 |
| Cables included | 9.8 ft 5-in-1 MC4 cable (Anderson, XT60, DC8020, DC7909, DC5521), 3 DC adapters | 1.5 m MC4-to-XT60 cable |
| USB ports | - | None |
| Build | ||
| Weight | 22.7 lb (10.3 kg) | 28.4 lb (12.9 kg) |
| Folded size | 26 x 35.5 in | 22.4 x 17.5 x 3.3 in (570 x 445 x 85 mm) |
| Unfolded size | 35.5 x 98.5 in | 100 x 45.1 x 0.1 in (2541 x 1146.6 x 3 mm) |
| Kickstand | Yes | Yes |
| Water resistance | IP65 | IP67 |
| Warranty | 2 years | 1 years |
| Released | - | 2026-08 |