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Generac GP8000E
Generac's big-box staple for whole-essentials backup.
Specs
| Running watts | 8,000 W |
| Starting watts | 10,000 W |
| Type | Open frame |
| Fuel | Gasoline |
| Fuel tank | 7.5 gal |
| Runtime (mfr claim) | ~11 h at 50% load |
| Outlets | Two 20A 125V GFCI, L14-30R (transfer switch), 120/240V |
| Start | Electric |
| CO safety shutoff | Varies by version — check the listing |
| Typical street price | ~$1,150 (fluctuates — check listing) |
Figures are the manufacturer's published specs; dashes mean the maker doesn't publish a number. Verify against the current datasheet before you buy.
What can it actually run?
Checked with the same math as our calculator: total running watts, plus the single largest motor surge on top. “Tight” means it technically fits but the load sits above 80% of rated output — fine briefly, not where you want to live.
- ✓ runs itFridge, Wi-Fi, and lights730 W running · 2,230 W peak
- ✓ runs itStorm essentials (fridge, freezer, furnace fan, sump pump)3,080 W running · 4,630 W peak
- ✓ runs itEssentials plus a 10,000 BTU window AC4,280 W running · 6,680 W peak
- ✗ too muchMost of the house (well pump, central AC, laundry)13,680 W running · 19,680 W peak
The installer's take
The GP series is what half of suburbia buys after their first multi-day outage: 8 kW running, a 10 kW surge that shrugs off a well pump start, and a 7.5-gallon tank that runs most of a day at half load. Parts and service are easy because everyone stocks Generac. It is exactly as loud as it looks.
Pros
- 10,000W surge handles well pumps and AC compressors
- Ubiquitous parts and service network
- Full-day runs on one tank at moderate load
Cons
- Open-frame loud
- Gasoline only — no propane fallback
Best for: Well-pump households and anyone standardizing on the most common service network.