The SUNGOLDPOWER 2240W (4 x 560W) Bifacial 4-Pack is the better rigid solar panel overall, rated 4.3 to 3.8. The SUNGOLDPOWER 2240W (4 x 560W) Bifacial 4-Pack leads on efficiency. The DOKIO 800W (2 x 400W) 2-Pack costs $1,000.23 less ($489.77 vs $1,490).
Large bifacial panels for an off-grid ground mount or barn roof with a high-voltage MPPT controller. For a permitted home rooftop, SUNGOLDPOWER’s UL-listed 590 W panel is the better buy.
Amazon $1,490A low-cost way to put 800 W on a shed roof or ground mount with an MPPT controller. Buyers who want a stated warranty and a full spec sheet should pay a little more for a better-documented brand.
Amazon $489.77Prices 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.
Each factor is scored 0-100 against the same fixed reference points for every 150 W and up rigid solar panel; a clear win is highlighted. How we rank explains each one.
| Factor weight | SUNGOLDPOWER 2240W (4 x 560W) Bifacial 4-Pack | DOKIO 800W (2 x 400W) 2-Pack |
|---|---|---|
| Overall rating | 4.3/5 | 3.8/5 |
| Value 45% | 80 $0.67 per rated watt | 85 $0.61 per rated watt |
| Tested output 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Durability 25% | 100 IP68, 12-year warranty | 50 IP rating and warranty not published (neutral score used) |
| Efficiency 15% | 74 21.7% module efficiency (from size and rated power) | 50 20.5% module efficiency (from size and rated power) |
| SUNGOLDPOWER 2240W (4 x 560W) Bifacial 4-Pack | DOKIO 800W (2 x 400W) 2-Pack | |
|---|---|---|
| Output | ||
| Rated power | 2,240 W | 800 W |
| Module efficiency | 21.7% (rated power over panel area) | 20.5% (rated power over panel area) |
| Claimed efficiency | 21.7% (module efficiency) | - |
| Cells | Monocrystalline (144 half-cut 182 mm cells; SUNGOLDPOWER's page and the Amazon title say N-type (Amazon adds 16BB), while the datasheet file and the Amazon title also say PERC) | Monocrystalline |
| Bifacial | Yes | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 50.1 V | 37.1 V |
| Voltage at max power (Vmp) | 42.1 V | 31 V |
| Short-circuit current (Isc) | 14.1 A | 13.2 A |
| Current at max power (Imp) | 13.3 A | - |
| Voc temperature coefficient | -0.3%/°C | - |
| Series / parallel | - | Yes |
| Connections | ||
| Output connector | - | MC4 |
| Build | ||
| Weight | 70.4 lb (31.8 kg) | - |
| Dimensions | 89.72 x 44.65 x 1.38 in (each panel) | 67.8 x 44.6 x 1.2 in (each panel) |
| Frame | anodized aluminum alloy | aluminum |
| Glass | 2.0 mm AR-coated heat-strengthened front, 2.0 mm heat-strengthened back (dual glass) | tempered |
| Junction box rating | IP68 | - |
| Warranty | 12 years | - |
| Output warranty | 30-year linear power warranty | - |
| Released | 2023-11 | - |
