Generac iQ3800 DF
#2 in Mid-sizeFull review
A dual-fuel mid-size inverter with long run time and electric start, suited to home essentials and jobsites. RV owners will need an L5-30 adapter for the 30 A outlet.
Amazon $849$849
The Generac iQ3800 DF is the better inverter generator overall, rated 4.0 to 3.3. The Generac iQ3800 DF leads on run time and starting. The Champion 4000W Dual Fuel Inverter wins on value. The Champion 4000W Dual Fuel Inverter costs $130 less ($719 vs $849).
Champion 4000W Dual Fuel Inverter
#11 in Mid-sizeFull review
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 $719$719
Prices 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.
Which should you buy?
- Choose the Generac iQ3800 DF for run time (20 hours on a tank at 25% load vs 10 hours on a tank at 25% load) and starting (push-button electric start vs pull start only).
- Choose the Champion 4000W Dual Fuel Inverter for value ($0.24 per running watt vs $0.28 per running watt).
Scores side by side
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 | Generac iQ3800 DF | Champion 4000W Dual Fuel Inverter |
|---|---|---|
| Overall rating | 4.0/5 | 3.3/5 |
| Value 30% | 67 $0.28 per running watt | 78 $0.24 per running watt |
| Quiet 20% | 50 noise level not published (neutral score used) | 12 64 dBA at light load, maker rating |
| Run time 15% | 100 20 hours on a tank at 25% load | 33 10 hours on a tank at 25% load |
| Fuel options 10% | 70 gasoline or propane | 70 gasoline or propane |
| 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 | 50 3-year warranty |
| Starting 5% | 80 push-button electric start | 0 pull start only |
Specifications
| Generac iQ3800 DF | Champion 4000W Dual Fuel Inverter | |
|---|---|---|
| Output | ||
| Gasoline | 3,000 W running, 3,800 W starting | 3,000 W running, 4,000 W starting |
| Propane | 2,700 W running, 3,400 W starting | 2,700 W running, 4,000 W starting |
| Outlets | 4 × 120 V, L5-30, USB | 2 × 120 V, TT-30 (RV) |
| Parallel capable | Yes | Yes |
| Total harmonic distortion | under 3% | under 3% |
| Price per watt | $0.28 | $0.24 |
| Fuel and run time | ||
| Fuel | Gasoline, propane | Gasoline, propane |
| Tank | 3.3 gal | 1.5 gal |
| Run time (gasoline) | 20 hr at 25% load | 10 hr at 25% load |
| Run time (propane, 20 lb tank) | 19 hr | 25 hr |
| Engine | 212 cc | 149 cc |
| Noise and safety | ||
| Rated noise (light load) | - | 64 dBA |
| CO shutoff | Yes | Yes |
| Build | ||
| Starting | Electric and recoil | Recoil (pull) |
| App | No | No |
| Wheels | Yes | No |
| Dimensions | 24.6 x 20.3 x 22.4 in | 17.9 x 11.7 x 19.7 in |
| Weight | 107 lb | 51.8 lb |
| Warranty | 3 years | 3 years |