Generac GP6500 COsense Portable Generator (76803, 49-state)

Which Generac this is: 76803, the 49-state configuration

The Amazon listing is sold by Amazon.com and gives part number 76803, model G0076803 and UPC 696471108279. Generac's product page for G0076803 gives base model 76803 and names it the GP6500 with COsense, 49ST, and Generac's current specification sheet (Rev. D, 7/14/2026) prints Model 7680-3 with UPC 696471108279 marked 49 State, the listing's own UPC.

Generac's earlier 2020 specification sheet listed a 7680 configuration as 49-State and a 7683 configuration as 50-State, so the configuration code matters if you live in a state with its own emissions rules. Generac's documents read here do not say which states the 49-state label excludes. California's Air Resources Board lists portable generators among the equipment its small off-road engine rules cover, so California buyers especially should ask Generac or a dealer whether this configuration can be sold and used there before they buy. The Amazon listing weight of 172 pounds matches Generac's unit weight.

6,500 running watts and what the outlets take

Generac's sheet gives 6,500 running watts and 8,125 starting watts at 120/240V and 60Hz, with 54.2 amps at 120V or 27.0 amps at 240V. The control panel has two 120V, 20A GFCI duplex outlets, one 120/240V, 30A L14-30R twist-lock outlet, one 2-pole 30A and two 1-pole 20A breakers, an hour meter and the two COsense lights.

The manual says each 120V outlet can carry loads of up to 2,400 watts or 20 amps, and that the twist-lock outlet takes up to 3,600 watts at 120V or 7,200 watts at 240V through a NEMA L14-30 plug on a four-wire cord rated for 250V at 30A; that outlet text is shared with the 8,000-watt GP8000E, and this generator's own limit is 6,500 running watts. It warns that induction motors need roughly three times their running watts to start, and its reference table lists 700 running watts for a refrigerator and 1,500 for a half-horsepower submersible pump, with starting loads marked by an asterisk.

Engine, fuel, oil and runtime

The engine is a 389cc overhead-valve unit with recoil pull start and a 7.9 gallon steel tank with a fuel gauge. Generac's sheet and manual give 11.5 hours at 50% load and, on the sheet, 16.5 hours at 25% load, while the product page's feature bullet and the Amazon listing both say 10.5 hours at 50% load, so plan on the lower figure.

The manual asks for clean, fresh unleaded gasoline of at least 87 octane with up to 10% ethanol (Generac recommends non-ethanol fuel where available) and never E85 or a gas-oil mix, and it calls for SAE 30, 10W-30 or synthetic 5W-30 oil in a 1.06 quart fill. It says to use petroleum oil for break-in before switching to synthetic, to change oil after the first 30 hours and then every season, and to check the level before each use. The carton holds a liter of SAE 30, and the handle, wheels and frame feet are fitted by the owner.

Where to run it: outdoors and 5 feet from everything

Generac's manual says never to run the generator indoors or in a partly enclosed area such as a garage, even with doors and windows open, and that a fan or an open door does not give enough ventilation. It says to run it outside, far from windows, doors, vents and crawl spaces, with the muffler exhaust pointed away from people and occupied buildings, and to leave at least 5 feet of clearance on all sides.

COsense monitors carbon monoxide while the engine runs and shuts the engine off if levels climb, with a red light that blinks for at least five minutes after a shutoff and a yellow light for a system fault. The manual says COsense is not a substitute for a battery-operated carbon monoxide alarm indoors, and that a fire extinguisher should be kept near the generator at all times.

Before refuelling, the manual says to check that the unit is off and has cooled for at least two minutes, and to fill only to 1/2 inch below the top of the tank, because spilled fuel on the engine can cause a fire or explosion. It also warns that water contact with a power source can cause electrocution.

Feeding a house circuit

The manual recommends a manual transfer switch when the generator is connected to a building's wiring, to prevent hazardous backfeeding and injury to utility workers, and says installation must follow local codes and be done by a qualified electrician. Generac's sheet lists the unit as HomeLink manual transfer switch compatible.

The generator's neutral is bonded to its frame, and the manual says a connected transfer switch must switch the neutral as well, which means a 3-pole switch. It also says to use a ground fault circuit interrupter in damp or highly conductive areas, and to start the generator outdoors before connecting loads by extension cord.

Warranty, registration and which manual to use

Generac's warranty document gives 3 years for consumer use, starting on successful registration, with parts and labor in the first year and parts only in years 2 and 3. Commercial and rental use is 2 years or 1,000 hours, whichever comes first. It requires registration or proof of purchase, service by an Independent Authorized Service Dealer, and proof of required maintenance, and it excludes damage from non-OEM parts and improper fuels.

The owner's manual that Generac's product page links is a 2025 file whose specification page covers the GP5500E. Generac's manual service for G0076803 instead serves the GP Series manual for the GP6500, GP6500E and GP8000E, Rev. F dated 12/15/2025, which is the manual used here. It does not print the code 76803, so check its figures against the manual in the carton.