GenMax GM3300i
3000 W, gasoline
Firman WH03042
Generator · Dual Fuel Inverter Generator. Specs from the manufacturer page (checked ).
The Firman WH03042 is a dual fuel inverter generator that runs on gasoline or propane, with 3,000 running watts and 3,300 starting watts on gasoline. It is powered by a 171cc Firman engine and has a 1.8-gallon fuel tank that provides up to 9 hours of runtime at 25% load.
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Running
3000W
Peak / surge
3300W
Fuel
dual-fuel
Noise
58dB
Key features
- Dual fuel: runs on gasoline or propane
- Gasoline output: 3,300 starting watts and 3,000 running watts
- Propane output: 3,000 starting watts and 2,700 running watts
- Less than 3% THD clean power for sensitive electronics
- Electric start with recoil backup
- Eco Mode adjusts engine speed to extend runtime
- 1.8-gallon fuel tank, up to 9 hours runtime at 25% load
- Low oil shutoff protection
- 58 dB at 25% load
What it is for
- RV trips
- camping
- tailgating
- home backup
Specifications
| Running watts | 3000 W |
|---|---|
| Peak / surge | 3300 W |
| Fuel | dual-fuel |
| Tank | 6.8 L (1.8 gal) |
| Noise | 58 dB |
| AC output voltage | 120V |
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.
Open the Firman manual (PDF) →
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 WH03042 start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 3300 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.