The Renogy 1180W (2 x 590W) Bifacial 2-Pack is the better rigid solar panel overall, rated 4.1 to 3.8. The Renogy 1180W (2 x 590W) Bifacial 2-Pack leads on efficiency. The DOKIO 800W (2 x 400W) 2-Pack wins on value. The DOKIO 800W (2 x 400W) 2-Pack costs $500.22 less ($489.77 vs $989.99).
Two very large Renogy bifacial panels for a home, cabin or ground-mount array with a high-voltage MPPT controller or hybrid inverter. Too big and too high-voltage for RV and van setups.
Amazon $1,095.99 Renogy $989.99A 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 | Renogy 1180W (2 x 590W) Bifacial 2-Pack | DOKIO 800W (2 x 400W) 2-Pack |
|---|---|---|
| Overall rating | 4.1/5 | 3.8/5 |
| Value 45% | 63 $0.84 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, 10-year warranty | 50 IP rating and warranty not published (neutral score used) |
| Efficiency 15% | 98 22.9% module efficiency (from size and rated power) | 50 20.5% module efficiency (from size and rated power) |
| Renogy 1180W (2 x 590W) Bifacial 2-Pack | DOKIO 800W (2 x 400W) 2-Pack | |
|---|---|---|
| Output | ||
| Rated power | 1,180 W | 800 W |
| Module efficiency | 22.9% (rated power over panel area) | 20.5% (rated power over panel area) |
| Claimed efficiency | 25% (cell efficiency, "up to"; module efficiency 22.8%) | - |
| Cells | Monocrystalline (N-type, 16BB) | Monocrystalline |
| Bifacial | Yes | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 52.6 V | 37.1 V |
| Voltage at max power (Vmp) | 43.7 V | 31 V |
| Short-circuit current (Isc) | 14.1 A | 13.2 A |
| Current at max power (Imp) | 13.5 A | - |
| Series / parallel | - | Yes |
| Connections | ||
| Output connector | - | MC4 |
| Build | ||
| Dimensions | 89.7 x 44.6 x 1.4 in (each panel) | 67.8 x 44.6 x 1.2 in (each panel) |
| Frame | black aluminum | aluminum |
| Glass | - | tempered |
| Junction box rating | IP68 | - |
| Warranty | 10 years | - |
| Output warranty | 95% output for 5 years, 90% for 10 years, 80% for 25 years | - |
| Released | 2025-08 | - |
