Generac GP6500 COsense
Generac GP6500 COsense is a portable generator from Generac, rated 6,500 running watts with 8,125 starting watts on gasoline, with 120/240V output.
| Type | portable |
|---|---|
| Fuel | gasoline |
| Running watts (gas / LP for standby) | 6500 W |
|---|---|
| Starting watts (gas) | 8125 W |
| Runtime at 50% load (gas) | 11.5 h |
|---|---|
| Fuel tank | 7.9 gal |
| Output voltage | 120/240V |
|---|---|
| Transfer-switch-ready outlet | 30 A |
| Start type | recoil |
|---|---|
| CO safety shutoff | Yes |
| Engine displacement | 389 cc |
|---|
| Weight | 172 lb |
|---|
What the numbers mean
- At 6,500 running watts on its best fuel, this unit covers a partial-home setup through a 30 A transfer switch or interlock: refrigerator, furnace, a well or sump pump, and lights, with load management for anything bigger.
- Runtime: 11.5 h at 50% load on the 7.9-gallon tank — roughly 18.4 h at 25% load (estimated) .
- Estimated fuel cost for 24 h at ~50% load: about $53 on gasoline at national average prices (assumptions).
- House hookup: pairs with a 30 A generator inlet ( L14-30) and a transfer switch or interlock installed by an electrician.
Compare the Generac GP6500 COsense
- Generac GP6500 COsense vs Champion 7000W Dual Fuel (100155)
- Generac GP6500 COsense vs Champion 7500W with 50A Outlet (100813)
- Generac GP6500 COsense vs Champion 7500W Dual Fuel (100891)
- Generac GP6500 COsense vs Champion 7500W Dual Fuel with CO Shield (201281)
- Generac GP6500 COsense vs DuroMax XP12000EH Dual Fuel
- Generac GP6500 COsense vs DuroMax XP5500EH Dual Fuel
- Generac GP6500 COsense vs Firman H08051 Dual Fuel 8000W
- Generac GP6500 COsense vs Firman T07571 Tri-Fuel 7500W
Similar generators
- Champion 7000W Dual Fuel (100155) ( 7,000 W running)
- Westinghouse WGen6000 ( 6,000 W running)
- Predator 9000 (59206) ( 7,250 W running)
- Champion 7500W with 50A Outlet (100813) ( 7,500 W running)
- Champion 7500W Dual Fuel (100891) ( 7,500 W running)
- Champion 7500W Dual Fuel with CO Shield (201281) ( 7,500 W running)
Frequently asked questions
What can the Generac GP6500 COsense run during an outage?
With 6,500 running watts on its best fuel, the Generac GP6500 COsense covers a partial-home setup through a 30 A transfer switch or interlock: refrigerator, furnace, a well or sump pump, and lights, with load management for anything bigger. Add up your actual loads with a sizing worksheet — the bands here are rough guidance, not a load calculation.
How long does the Generac GP6500 COsense run on a tank of gas?
About 11.5 hours at 50% load on its 7.9-gallon tank, per the manufacturer's rating. At a lighter 25% load, figure roughly 18.4 hours (estimated — fuel burn does not scale linearly with load).
What does the Generac GP6500 COsense cost to run for a day?
Roughly $53 for 24 hours of continuous operation at about 50% load on gasoline, at national average fuel prices. The assumptions behind this estimate are documented on the methodology page; your fuel price and load change the figure.
Does the Generac GP6500 COsense have a CO safety shutoff?
Yes — the Generac GP6500 COsense has a built-in carbon monoxide sensor that shuts the engine down when CO accumulates around the unit. It is a backstop, not a substitute for running the generator outdoors at least 20 feet from the house.
What inlet does the Generac GP6500 COsense need to power a house?
A 30 A generator inlet (an L14-30 connection) wired to a transfer switch or interlock kit — an electrician's job that normally requires a permit. Never backfeed through a dryer or wall outlet.
Sources
- www.generac.com (retrieved 2026-07-23)
- manfilemode-generacsoa.generac.com (retrieved 2026-07-24)