The ZOUPW 480W Bifacial (DS480W) is the better portable solar panel overall, rated 4.5 to 4.3. The ZOUPW 480W Bifacial (DS480W) leads on durability and efficiency. The TWELSEAVAN 400W Portable wins on value and features. The TWELSEAVAN 400W Portable costs $150 less ($399.99 vs $549.99).
A light, high-wattage bifacial panel for owners of large power stations with a 50 V-plus solar input, especially over reflective ground. Owners of small or low-voltage stations should look elsewhere.
Amazon $549.99A 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 24, 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 | ZOUPW 480W Bifacial (DS480W) | TWELSEAVAN 400W Portable |
|---|---|---|
| Overall rating | 4.5/5 | 4.3/5 |
| Value 30% | 77 $1.15 per rated watt | 86 $1.00 per rated watt |
| Tested output 20% | 100 not yet tested; estimated 92% of rated watts from 1 test of ZOUPW panels and 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% | 100 21.3 W per lb (22.5 lb (10.2 kg)) | 97 17.6 W per lb (22.7 lb (10.3 kg)) |
| Durability 15% | 100 IP68, 3-year warranty | 56 IP65, 2-year warranty |
| Efficiency 10% | 100 25.6% claimed efficiency | 83 24% claimed efficiency |
| Features 10% | 25 bifacial | 35 built-in kickstand |
| ZOUPW 480W Bifacial (DS480W) | TWELSEAVAN 400W Portable | |
|---|---|---|
| Output | ||
| Rated power | 480 W | 400 W |
| Tested output | Not tested (estimated 92%) | Not tested (estimated 88%) |
| Efficiency | 25.6% (ZOUPW's 'up to 25.6%' figure, not stated as cell or module; the Amazon listing says 25%+) | 24% (cell efficiency per the Amazon listing) |
| Cells | Monocrystalline (N-type, 16BB, 182 mm cells) | Monocrystalline |
| Bifacial | Yes, up to 144 W more from the back | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 49.3 V | 46.9 V |
| Voltage at max power (Vmp) | 42.5 V | 40 V |
| Short-circuit current (Isc) | 12 A | 10.6 A |
| Current at max power (Imp) | 11.3 A | 10 A |
| Connections | ||
| Output connector | - | MC4 |
| Cables included | 13 ft 12AWG solar extension cable, 2 ft 12AWG 4-in-1 adapter cable (DC7909 with DC8020 adapter, XT60, Anderson) | 9.8 ft 5-in-1 MC4 cable (Anderson, XT60, DC8020, DC7909, DC5521), 3 DC adapters |
| Build | ||
| Weight | 22.5 lb (10.2 kg) | 22.7 lb (10.3 kg) |
| Folded size | 34.65 x 32.56 x 3.35 in (880 x 827 x 85 mm) | 26 x 35.5 in |
| Unfolded size | 138.58 x 32.56 x 0.87 in (3520 x 827 x 22 mm) | 35.5 x 98.5 in |
| Kickstand | - | Yes |
| Water resistance | IP68 | IP65 |
| Warranty | 3 years | 2 years |
| Released | 2026-03 | - |
