Generac GP6500E
#8 in Mid-sizeFull review
A mid-size gasoline generator for running a home’s essentials through a transfer switch at a low price. A good fit for buyers who don’t need propane.
Amazon $899$899
3.9/5
A gasoline generator for backing up most of a home’s essentials through a 30 A transfer switch at a low price. Buyers who want propane should look at a dual-fuel model.
- 8,000 / 10,000 WRunning / starting
- GasolineFuel
- 10 hr at 50% loadRun time
- Yes, 240 VTransfer switch
- 198 lbWeight
- $0.13Price / W
Check price at Amazon$1,049
Price checked October 28, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Enough power for a well pump, furnace and fridge through a transfer switch
- Low price for an 8,000 W generator with electric start
- Runs about 10 hours on a tank at half load
- Shuts itself off if carbon monoxide builds up nearby
Cons
- Gasoline only
- Only a 30 A twist-lock for the house, no 50 A outlet
- Nearly 200 lb
The Generac GP COsense family
Every Generac GP COsense model we rank, smallest first. Ratings compare each against its own size.
| Model | Running / starting | Rating | Price |
|---|---|---|---|
| Generac GP3600 | 3,600 / 4,500 W | 3.4/5 | $549 |
| Generac GP6500E | 6,500 / 8,125 W | 4.0/5 | $899 |
| Generac GP8000E (this one) | 8,000 / 10,000 W | 3.9/5 | $1,049 |
| Generac GP8000E EFI | 8,000 / 10,000 W | 3.9/5 | $1,299 |
How it scores
The rating comes from 7 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | GP8000E COsense 49ST/CSA (G0077151) |
|---|---|
| Output | |
| Gasoline | 8,000 W running, 10,000 W starting |
| Outlets | 4 × 120 V, L14-30 |
| Transfer switch ready | Yes, 240 V |
| Full power at 120 V | No |
| Price per watt | $0.13 |
| Fuel and run time | |
| Fuel | Gasoline |
| Tank | 7.9 gal |
| Run time (gasoline) | 10 hr at 50% load |
| Engine | 420 cc |
| Noise and safety | |
| CO shutoff | Yes |
| CARB compliant | No |
| Build | |
| Starting | Electric and recoil |
| Wheels | Yes |
| Dimensions | 27.2 x 27 x 26.5 in |
| Weight | 198 lb |
| Warranty | 3 years |
| Released | 2023-12 |
Alternatives in this size
Westinghouse WGen7500c
#9 in Mid-sizeFull review
A gasoline generator big enough for most essentials through a transfer switch, with remote start. Best for homeowners who don’t need propane and want simple 240 V backup.
Amazon $849$849
WEN DF1100T
#11 in Mid-sizeFull review
A mid-size dual-fuel generator for feeding a 50 A transfer switch on a budget, though the CO-sensing DF1100X is the safer pick.
Amazon $849$849
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