Greenmagic 400W (GM400B)
#4 in LargeFull review
A low-cost 400 W folding panel for owners of large power stations who camp by the car or RV. The thin spec sheet means checking a station’s voltage limit before buying.
Amazon $315.99$315.99
The Greenmagic 400W (GM400B) is the better portable solar panel overall, rated 4.3 to 4.0. The Greenmagic 400W (GM400B) leads on value and features. The BLUETTI SORA 500 (500W) wins on durability and efficiency. The Greenmagic 400W (GM400B) costs $483.01 less ($315.99 vs $799).
BLUETTI SORA 500 (500W)
#11 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 $799 BLUETTI $849$799
Prices were last checked October 26, 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 Greenmagic 400W (GM400B) for value ($0.79 per rated watt vs $1.60 per rated watt) and features (built-in kickstand, series/parallel vs built-in kickstand).
- Choose the BLUETTI SORA 500 (500W) for durability (IP67, 1-year warranty vs IP65) and efficiency (25% claimed efficiency vs 23.5% 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 | Greenmagic 400W (GM400B) | BLUETTI SORA 500 (500W) |
|---|---|---|
| Overall rating | 4.3/5 | 4.0/5 |
| Value 30% | 98 $0.79 per rated watt | 52 $1.60 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% | 100 18.6 W per lb (21.5 lb (9.8 kg)) | 97 17.6 W per lb (28.4 lb (12.9 kg)) |
| Durability 15% | 36 IP65 | 60 IP67, 1-year warranty |
| Efficiency 10% | 75 23.5% claimed efficiency | 100 25% claimed efficiency |
| Features 10% | 55 built-in kickstand, series/parallel | 35 built-in kickstand |
Specifications
| Greenmagic 400W (GM400B) | BLUETTI SORA 500 (500W) | |
|---|---|---|
| Output | ||
| Rated power | 400 W | 500 W |
| Tested output | Not tested (estimated 88%) | Not tested (estimated 88%) |
| Efficiency | 23.5% (the listing gives a 21.5-23.5% range without saying cell or module; the top of the range is recorded) | 25% (up to 25%, as quoted by BLUETTI) |
| Cells | Monocrystalline | Monocrystalline (N-type) |
| Bifacial | No | No |
| Electrical | ||
| Open-circuit voltage (Voc) | - | 49.1 V |
| Voltage at max power (Vmp) | - | 40.9 V |
| Short-circuit current (Isc) | - | 13.3 A |
| Current at max power (Imp) | - | 10.2 A |
| Series / parallel | Yes | - |
| Connections | ||
| Output connector | MC4 | MC4 |
| Cables included | - | 1.5 m MC4-to-XT60 cable |
| USB ports | None | None |
| Build | ||
| Weight | 21.5 lb (9.8 kg) | 28.4 lb (12.9 kg) |
| Folded size | 32.09 x 31.30 x 1.97 in | 22.4 x 17.5 x 3.3 in (570 x 445 x 85 mm) |
| Unfolded size | - | 100 x 45.1 x 0.1 in (2541 x 1146.6 x 3 mm) |
| Kickstand | Yes | Yes |
| Water resistance | IP65 | IP67 |
| Warranty | - | 1 years |
| Released | 2025-09 | 2026-08 |