The Champion 4000W Dual Fuel Inverter and the Predator 3500 Super Quiet are evenly matched, rated 3.3 and 3.3. The Champion 4000W Dual Fuel Inverter leads on fuel options and warranty. The Predator 3500 Super Quiet wins on starting and run time. The Champion 4000W Dual Fuel Inverter costs $80.99 less ($719 vs $799.99).
A compact dual-fuel inverter for small RVs and basic home backup at a low price per watt. It can just about run a small RV air conditioner, but don’t expect much else alongside it.
Amazon $719A low-cost way to run a 30 A camper with one air conditioner, with electric start and CO shutoff. Expect to buy an extended warranty if you want long-term cover.
Harbor Freight $799.99Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Each factor is scored 0-100 against the same fixed reference points for every mid-size inverter generator; a clear win is highlighted. How we rank explains each one.
| Factor weight | Champion 4000W Dual Fuel Inverter | Predator 3500 Super Quiet |
|---|---|---|
| Overall rating | 3.3/5 | 3.3/5 |
| Value 30% | 78 $0.24 per running watt | 71 $0.27 per running watt |
| Quiet 20% | 12 64 dBA at light load, maker rating | 56 57 dBA at light load, maker rating |
| Run time 15% | 33 10 hours on a tank at 25% load | 42 11 hours on a tank at 25% load |
| Fuel options 10% | 70 gasoline or propane | 0 gasoline only |
| CO safety 10% | 100 shuts off when carbon monoxide builds up | 100 shuts off when carbon monoxide builds up |
| Warranty 10% | 50 3-year warranty | 0 0.2-year warranty |
| Starting 5% | 0 pull start only | 80 push-button electric start |
| Champion 4000W Dual Fuel Inverter | Predator 3500 Super Quiet | |
|---|---|---|
| Output | ||
| Gasoline | 3,000 W running, 4,000 W starting | 3,000 W running, 3,500 W starting |
| Propane | 2,700 W running, 4,000 W starting | - |
| Outlets | 2 × 120 V, TT-30 (RV) | 2 × 120 V, L5-30 |
| Parallel capable | Yes | Yes |
| Total harmonic distortion | under 3% | - |
| Price per watt | $0.24 | $0.27 |
| Fuel and run time | ||
| Fuel | Gasoline, propane | Gasoline |
| Tank | 1.5 gal | 2.3 gal |
| Run time (gasoline) | 10 hr at 25% load | 11 hr at 25% load |
| Run time (propane, 20 lb tank) | 25 hr | - |
| Engine | 149 cc | 212 cc |
| Noise and safety | ||
| Rated noise (light load) | 64 dBA | 57 dBA |
| CO shutoff | Yes | Yes |
| CARB compliant | - | No |
| Build | ||
| Starting | Recoil (pull) | Electric and recoil |
| App | No | No |
| Wheels | No | Yes |
| Dimensions | 17.9 x 11.7 x 19.7 in | 22.75 x 17.3 x 20 in |
| Weight | 51.8 lb | 102 lb |
| Warranty | 3 years | 0.2 years |
