A tri-fuel inverter for home backup through a transfer switch, with clean power and a 50 A outlet. Natural gas hookup makes it a strong pick for long outages.
Amazon $1,399
A large dual-fuel inverter for whole-home backup with clean power and long run time. Best for homeowners with a transfer switch who want inverter quiet at open-frame output.
- 9,000 / 12,000 WRunning / starting
- Gasoline, propaneFuel
- 19 hr at 25% loadRun time
- 64 dBA at light loadNoise
- 189 lbWeight
- $0.21Price / W
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
- Enough power for most of a house through a transfer switch
- Both 14-50R and L14-30R outlets fit common transfer switches and 50 A RVs
- Large 7.9 gal tank runs up to 19 hours at light load
- Remote key fob and push-button start
- Shuts itself off if carbon monoxide builds up nearby
- Nearly 190 lb, so it needs flat ground to wheel around
- Louder than the smaller Westinghouse inverters
- Not CARB compliant, so it cannot be sold in California
How it scores
The rating comes from 7 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | iGen12000DFc (part 11023) |
|---|---|
| Output | |
| Gasoline | 9,000 W running, 12,000 W starting |
| Propane | 8,100 W running, 11,000 W starting |
| Outlets | 2 × 120 V, L14-30 |
| Parallel capable | Yes |
| Total harmonic distortion | under 3% |
| Price per watt | $0.21 |
| Fuel and run time | |
| Fuel | Gasoline, propane |
| Tank | 7.9 gal |
| Run time (gasoline) | 19 hr at 25% load |
| Run time (propane, 20 lb tank) | 9 hr |
| Engine | 457 cc |
| Noise and safety | |
| Rated noise (light load) | 64 dBA |
| CO shutoff | Yes |
| CARB compliant | No |
| Build | |
| Starting | Remote, electric and recoil |
| App | No |
| Wheels | Yes |
| Dimensions | 30.2 x 25.2 x 26.6 in |
| Weight | 189 lb |
| Warranty | 3 years |
Alternatives in this size
A home-backup inverter for people who want to run most of a house, including central air on many systems, through a transfer switch. Long runtime, CO shutoff and a five-year warranty make it good value for its size.
Amazon $1,999A mid-size home-backup inverter for people with a natural gas line or a transfer switch who want unattended starting. It also covers a 30 A RV.
Amazon $1,299Compare
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