WEN DG4500iX
3650 W, dual-fuel
Firman W03663OF
Generator · Legendary. Specs from the manufacturer page (checked ).
The Firman W03663OF is a gasoline inverter generator with 3650 running watts and 4500 starting watts. It has a 208cc engine, a 6-gallon fuel tank, and up to 22 hours of runtime at 25% load.
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Running
3650W
Peak / surge
4500W
Fuel
gasoline
Noise
67dB
Weight
48.1kg
Warranty
3yr
Key features
- 208cc engine with recoil start and electric start, plus remote start
- Low oil shut off
- Eco mode varies engine speed with load for fuel efficiency
- Outlets: 5-20R 120V 20A duplex, L5-30R 120V 30A twistlock, 14-50R 120V/240V 50A, USB-A (2.1A/5V DC/10W), and 12V DC power port (8.3A/12V DC/100W)
- 3-year warranty
Specifications
| Running watts | 3650 W |
|---|---|
| Peak / surge | 4500 W |
| Fuel | gasoline |
| Tank | 22.7 L (6.0 gal) |
| Noise | 67 dB |
| AC output voltage | 120V |
| Weight | 48.1 kg (106.0 lb) |
| Warranty | 3 years |
From the Firman page. Values the manufacturer does not publish are left out.
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Connection and wiring
Follow the diagrams in the Firman manual. Connecting to a home panel needs a transfer switch or interlock and a licensed electrician.
- Wiring diagram, manual page 3 →
- Wiring diagram, manual page 35 →
- Wiring diagram, manual page 36 →
- Wiring diagram, manual page 37 →
- Wiring diagram, manual page 38 →
Error codes and troubleshooting
| Code | Meaning | What to do | Manual page |
|---|---|---|---|
| Circuit Breakers | The receptacles are protected by an AC circuit protector that trips if the generator is overloaded or an external short circuit occurs. | Disconnect all electrical loads and determine the cause before using the generator again. If overloading caused the trip, reduce the load. Reset by pressing the protector button. Continuous tripping may damage the generator or equipment. | 8 |
| Oil Warning Indicator Light | Indicates the oil has fallen below the minimum level. The engine stops automatically and will not start until the proper amount of oil is in the crankcase. | Check the oil level when this light turns on. Add the proper amount of engine oil to the crankcase before attempting to start the engine. | 8 |
| Overload Indicator Light | Connected devices have exceeded the generator's wattage or amperage capacity, or a power surge occurred. The AC Power light goes off, the engine keeps running, and power to the receptacles is cut. | Keep the total power drawn from all receptacles within the nameplate rating. | 8 |
| Circuit Breaker | The receptacles are protected by an AC circuit protector that trips if the generator is overloaded or an external short circuit occurs. | Disconnect all electrical loads and find the cause before using the generator again. If overloading caused the trip, reduce the load. Reset by pressing the button on the protector. Continuous tripping may damage the generator or equipment. | 9 |
| Output Ready | Stays on during normal operation. Turns off when the generator is overloaded. | — | 9 |
| AC Reset | The inverter has entered a protective state and AC output is interrupted. | Press the AC Reset Button to restore the output. | 12 |
6 of 13 codes. From the Firman manual. All 13 WH03242 / T09371 / H07553 / W03083 codes →
FAQ
Can the Firman W03663OF start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 4500 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.