Firman W02081
Generator. Specs from the manufacturer page (checked ).

The Firman W02081 is a gasoline inverter generator with 2000 running watts and 2500 starting watts at 120 volts. It has an 80cc Firman engine, a 1.1-gallon fuel tank, and up to 8 hours of run time at 25% load.
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Running
2000W
Peak / surge
2500W
Fuel
gasoline
Weight
19.46kg
Warranty
3yr
Key features
- 2000 running watts and 2500 starting watts
- 80cc Firman engine with recoil start
- 1.1-gallon gas tank
- Up to 8 hours of run time at 25% load
- Low oil shutoff and CO alert
- Outlets: one 5-20R 120V 20A, one L5-30R 120V 30A twistlock, one USB-A (2.1A/5V DC/10W), one 12V DC port (8.3A/12V DC/100W)
- 3-year warranty
Specifications
| Running watts | 2000 W |
|---|---|
| Peak / surge | 2500 W |
| Fuel | gasoline |
| Tank | 4.16 L (1.1 gal) |
| AC output voltage | 120V |
| Weight | 19.46 kg (42.9 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 37 →
- Wiring diagram, manual page 38 →
- Wiring diagram, manual page 39 →
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 W02081 start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 2500 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.