A-iPower AP3700i
3200 W, gasoline
Firman W03386
Generator. Specs from the manufacturer page (checked ).
The Firman W03386 is a portable inverter generator rated at 3,300 running watts with 4,125 starting watts. It outputs 120V and runs up to 9 hours at 25% load on a single tank.
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Running
3300W
Peak / surge
4125W
Key features
- 3,300 running watts and 4,125 starting watts
- 120V output
- Up to 9 hours of runtime at 25% load on a single tank
- CO Alert technology
- Remote start
- Described as whisper-quiet operation
What it is for
- RV living
- Camping trips
- Tailgating
- Recreational use
Specifications
| Running watts | 3300 W |
|---|---|
| Peak / surge | 4125 W |
| AC output voltage | 120V |
From the Firman page. Values the manufacturer does not publish are left out.
What is in the box
- Engine oil bottle
- Oil funnel
- Spark plug wrench
- Screwdriver
- 12V battery cable
- Remote control
- Floater charger
- Quick oil drain
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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 →
- Wiring diagram, manual page 40 →
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 W03386 start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 4125 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.