Head to head
Generac GP8000E COsense vs Generac GP6500 COsense
Generac · Portable Generator
Generac GP8000E COsense
~$979
8,000 W / 10,000 W surge · up to well pump or a small central AC
Generac · Portable Generator
Generac GP6500 COsense
~$999
6,500 W / 8,125 W surge · up to furnace blower, sump pump or a window AC
Quick takeThe Generac GP8000E COsense lists about $20 lower; the Generac GP8000E COsense puts out more sustained power (8,000 W).
| Spec | Generac GP8000E COsense | Generac GP6500 COsense |
|---|---|---|
| Approx. price | ~$979 | ~$999 |
| Type | Portable Generator | Portable Generator |
| Fuel | Gasoline | Gasoline |
| Running / output watts | 8,000 W | 6,500 W |
| Starting / surge watts | 10,000 W | 8,125 W |
| Battery capacity | — | — |
| Expandable to | — | — |
| Noise | — | — |
| Runtime | up to 11 hrs @ 50% load (7.9 gal) | 16.5 hrs at 25% load, 11.5 hrs at 50% on 7.9 gal |
| Outlets | 4x 120V 20A (5-20R), 1x 120/240V 30A (L14-30R) | 2x 120V 20A GFCI (5-20R duplex), 1x 120/240V 30A (L14-30R) |
| Fuel tank | 7.9 gal | 7.9 gal |
| Weight | 198 lbs | 182 lbs |
| Transfer-switch ready | Yes | Yes |
| Warranty | 3-year limited | 3-year residential, 1-year commercial |
Highlighted cell is the better figure for that row.
Owner pros and cons
Generac GP8000E COsense
- +8,000 running watts under $1,000 with electric start
- +PowerRush 10,000W surge starts well pumps and AC
- +L14-30R 240V ready for an interlock
- +COsense CO shutdown standard
- +11-hour half-load runtime on the 7.9-gal steel tank
- −Loud open-frame operation; no published dB spec
- −Non-inverter power — keep sensitive electronics buffered
- −Gasoline only; no propane option in this SKU
- −Recall history (2022 handle, 2026 carb leak) requires serial checks
- −198 lbs with a narrow wheelbase on rough ground
Generac GP6500 COsense
- +L14-30R outlet feeds a 30-amp transfer switch
- +PowerRush gives 8,125 W starting capacity for motors
- +Electric start with a battery included
- +20-foot multi-outlet cord and hour meter included
- +Generac dealer and parts network is the largest in the US
- −No noise figure published on the page or the spec sheet
- −Gasoline only, with the usual stale-fuel storage problem
- −182 lbs limits who can move it alone
- −Neutral is bonded to ground, which matters when wiring some transfer setups
- −Rated a step below the 7,500 W class that most whole-house loads call for