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, fuel options and warranty. The Predator 3500 Super Quiet costs $49.01 less ($799.99 vs $849).
Predator 3500 Super Quiet
#12 in Mid-sizeFull review
A 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 $799.99$799.99
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 11 hours on a tank at 25% load), fuel options (gasoline or propane vs gasoline only) and warranty (3-year warranty vs 0.2-year warranty).
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 | Predator 3500 Super Quiet |
|---|---|---|
| Overall rating | 4.0/5 | 3.3/5 |
| Value 30% | 67 $0.28 per running watt | 71 $0.27 per running watt |
| Quiet 20% | 50 noise level not published (neutral score used) | 56 57 dBA at light load, maker rating |
| Run time 15% | 100 20 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% | 80 push-button electric start | 80 push-button electric start |
Specifications
| Generac iQ3800 DF | Predator 3500 Super Quiet | |
|---|---|---|
| Output | ||
| Gasoline | 3,000 W running, 3,800 W starting | 3,000 W running, 3,500 W starting |
| Propane | 2,700 W running, 3,400 W starting | - |
| Outlets | 4 × 120 V, L5-30, USB | 2 × 120 V, L5-30 |
| Parallel capable | Yes | Yes |
| Total harmonic distortion | under 3% | - |
| Price per watt | $0.28 | $0.27 |
| Fuel and run time | ||
| Fuel | Gasoline, propane | Gasoline |
| Tank | 3.3 gal | 2.3 gal |
| Run time (gasoline) | 20 hr at 25% load | 11 hr at 25% load |
| Run time (propane, 20 lb tank) | 19 hr | - |
| Engine | 212 cc | 212 cc |
| Noise and safety | ||
| Rated noise (light load) | - | 57 dBA |
| CO shutoff | Yes | Yes |
| CARB compliant | - | No |
| Build | ||
| Starting | Electric and recoil | Electric and recoil |
| App | No | No |
| Wheels | Yes | Yes |
| Dimensions | 24.6 x 20.3 x 22.4 in | 22.75 x 17.3 x 20 in |
| Weight | 107 lb | 102 lb |
| Warranty | 3 years | 0.2 years |