Home Power Facts Portable generator
Generac GP8000E
The Generac GP8000E is a conventional generator rated 8,000 W running and 10,000 W starting on gasoline, with a 240 V outlet. It can run 29 of the 29 household loads we track. The manufacturer rates it at 15.5 hours on a 7.9 gal tank at 25% load, about 12.2 gallons a day at that load.
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Specs
| Type | Conventional |
|---|---|
| Fuel | gasoline[source]Full model name on the official page: GP8000E, 50ST, model 8929 (EFI, COsense). The spec sheet says '12-Hour Runtime when running on gasoline'. The product page spec block lists 'Fuel Type: Gaseous', which appears to be a data error. The older GP8000E COsense 49ST page (model 7675) is also still live at https://www.generac.com/residential-products/portable-generators/8000-portable-generator-electric-start-with-cosense-76755/; the current 2024 model 8929 is used here. |
| Running watts (gasoline) | 8,000 W[source]CONFLICT: the spec sheet (Rev. A 12/03/2024) says 8000. The product page spec block says 9,200, alongside other values that look like another model's (459cc, Gaseous). Spec sheet value used. |
| Starting watts (gasoline) | 10,000 W[source]CONFLICT: the spec sheet says 10000 and the product page spec block says 11,250. Spec sheet value used. |
| Fuel tank | 7.9 gal[source]7.9 gal (29.9 L). The product page shows the same figure. |
| Runtime on a full tank | 15.5 h[source]Run Time at 25% 15.5 h. At 50% load the spec sheet and the product page description give 12 h. CONFLICT: the product page spec block says 8.5 h at 50%. at 25% load |
| Noise | Not publishedThe spec sheet, product page and owner's manual give no dB figure. |
| 240 V outlet | Yes[source]Outlets: (1) 120/240V 30A L14-30R twist-lock and (2) 120V 20A 5-20R GFCI duplex. HomeLink manual transfer switch compatible. |
| CO shut-off sensor | Yes[source]COsense. The owner's manual says that if CO accumulates, 'COsense shuts off the engine'. A red light shows a CO hazard and a yellow light shows a fault. |
| Weight | 207 lb[source]Unit Weight 207 lb (93.3 kg); shipping weight is 220 lb. CONFLICT: the product page spec block says 213 lb. Spec sheet value used. |
| List price | Not publishedgenerac.com shows no price. It uses a PriceSpider where-to-buy widget (ps-sku 8929), and shop.generac.com is a B2B portal. Retailer prices not used. Checked 2026-10-19. |
Fuel cost: about $1.10 per kWh at the stated load (0.25 gal/kWh × $4.33/gal, the EIA US average). This applies at the stated load only.
What it can run
"Yes" means the running watts fit within 8,000 W and the startup surge within 10,000 W. Unlike a battery, a generator runs as long as it has fuel, so there is no runtime per appliance; see fuel use above.