The Generac GP6700E Dual Fuel EFI is the better portable generator overall, rated 4.2 to 3.7. The Generac GP6700E Dual Fuel EFI leads on fuel options, starting and run time. The Champion 7500-Watt CARB wins on value. The Champion 7500-Watt CARB costs $229.01 less ($929.99 vs $1,159).
A fuel-injected dual-fuel generator for backing up a home’s essentials through a 30 A transfer switch, and the GP6700E DF to buy in California. Elsewhere the carbureted GP6700E DF does the same job for less.
Amazon $1,159A mid-size gas generator for California homes that need a CARB-compliant unit to run essential circuits through a transfer switch.
Tractor Supply $929.99Prices were last checked October 28, 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 portable generator; a clear win is highlighted. How we rank explains each one.
| Factor weight | Generac GP6700E Dual Fuel EFI | Champion 7500-Watt CARB |
|---|---|---|
| Overall rating | 4.2/5 | 3.7/5 |
| Value 30% | 60 $0.17 per running watt | 69 $0.15 per running watt |
| Run time 15% | 90 13 hours on a tank at 50% load | 70 11 hours on a tank at 50% load |
| Fuel options 15% | 70 gasoline or propane | 0 gasoline only |
| Home hookup 15% | 100 240 V outlet for a transfer switch | 100 240 V outlet for a transfer switch |
| CO safety 10% | 100 shuts off when carbon monoxide builds up | 100 shuts off when carbon monoxide builds up |
| Warranty 10% | 67 3-year warranty | 67 3-year warranty |
| Starting 5% | 80 push-button electric start | 0 pull start only |
| Generac GP6700E Dual Fuel EFI | Champion 7500-Watt CARB | |
|---|---|---|
| Output | ||
| Gasoline | 6,700 W running, 8,250 W starting | 6,000 W running, 7,500 W starting |
| Propane | 6,000 W running, 7,425 W starting | - |
| Outlets | 4 × 120 V, L14-30 | 4 × 120 V, L14-30 |
| Transfer switch ready | Yes, 240 V | Yes, 240 V |
| Full power at 120 V | No | No |
| Price per watt | $0.17 | $0.15 |
| Fuel and run time | ||
| Fuel | Gasoline, propane | Gasoline |
| Tank | 7.5 gal | 7.7 gal |
| Run time (gasoline) | 13 hr at 50% load | 11 hr at 50% load |
| Run time (propane, 20 lb tank) | 6 hr | - |
| Engine | 340 cc | 389 cc |
| Noise and safety | ||
| Rated noise | - | 74 dBA |
| CO shutoff | Yes | Yes |
| CARB compliant | Yes | Yes |
| Build | ||
| Starting | Electric and recoil | Recoil (pull) |
| Wheels | Yes | Yes |
| Dimensions | 27.5 x 27 x 26.5 in | 26.9 x 21.7 x 22.6 in |
| Weight | 181 lb | 164 lb |
| Warranty | 3 years | 3 years |
| Released | - | 2021-08 |
