FIRMAN WH03562OF 4400W Dual Fuel Open Frame Inverter
A dual-fuel open-frame inverter generator rated at 3,500 running and 4,400 starting watts, with a 6-gallon tank and up to 22 hours of runtime at 25% load. It has an RV-ready TT-30R outlet and can run in parallel with a second unit.
- Running watts
- 3,500 W
- Starting / surge watts
- 4,400 W
- Fuel
- gasoline, propane
- Best for
- RV trips and home backup for a fridge, lights and electronics, with clean power.
- Not for
- Whole-home backup or 240V appliances.
Paid link: we may earn a commission if you buy through it, at no extra cost to you.
Specifications
| Running watts | 3,500 W |
|---|---|
| Starting / surge watts | 4,400 W |
| Fuel | gasoline, propane |
| Inverter (clean power) | Yes |
| Parallel capable | Yes |
| Runtime at 25% load | 22 h |
|---|---|
| Fuel tank | 6 gal |
| Outlets | 120V TT-30R (RV) |
|---|
Checked 29 October 2026. Sources: firmanpowerequipment.com.