Champion 3500-Watt Dual Fuel RV Ready (100307)
3500 W, dual-fuel
Firman WT03571
Generator · Legendary. Specs from the manufacturer page (checked ).
The Firman WT03571 is a dual-fuel inverter generator with a 145cc engine, 3500 W running output on gasoline and 4400 W starting output. It also runs on liquid propane (3200 W running) and natural gas (2800 W running). It has a 1.6-gallon gas tank and runs up to 8 hours at 25% load.
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Running
3500W
Peak / surge
4400W
Fuel
dual-fuel
Noise
64dB
Warranty
3yr
Key features
- 145cc Firman engine; starting watts 4400 (gasoline), 4000 (LPG), 3500 (natural gas); running watts 3500 (gas), 3200 (LPG), 2800 (natural gas)
- Electric start and recoil start
- Outlets: one 5-20R 120V 20A, one L5-30R 120V 30A twistlock, one DC power port 8.3A/12V, one USB-A and one USB-C port (5V 3A, 9V 3A, 12V 2.5A)
- 1.6-gallon gas tank; up to 8 hours run time at 25% load
- Low oil shutoff and new CO alert technology
- Turbo Mode and Super Eco Mode
- 3-year warranty
Specifications
| Running watts | 3500 W |
|---|---|
| Peak / surge | 4400 W |
| Fuel | dual-fuel |
| Tank | 6.1 L (1.6 gal) |
| Noise | 64 dB |
| AC output voltage | 120 volts |
| 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.
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 WT03571 start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 4400 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.