Gas Consumption of Generator

[ohligerj]

how much gas will my 7000w generator use?

[NLOVNIT]

We've got an Onan 5500 & our service tech says it'll use about 1 gal in 3 hours run time. Don't know if that is under load or not, though.

Lori-

[sknight]

My Honda 4500 will run my camper with the AC running near constant 8-10 hours on five gallons of gas. That's 5/8-1/2 gallon per hour. On a 7000 I'd suspect that will go up to 3/4-1 gallon per hour depending on engine size and load.

Interestingly if allowed to idle like when I powered my house during an outage it went nearly 24 hours on a tank. Eco throttle works.

[Bill Adams]

A 7000 should burn 1/2 to 1 gallon per hour depending upon how much "stuff" you have running at the same time. A couple of A/C units will keep you burning on the high end and just running the TV's, microwave and battery charger would tend toward the low end of this range.

[Izzyblueye]

Load will affect the fuel usage. Tops 1-1.25 gph.

[Gary RVRoamer]

If you have the Onan Marquis Gold 7000 or the QG 7000, Onan rates it at 0.7 gal/hour at 50% load (3500 watts) or 1.2 ga/hr at full load (7000 watts). The LP model is slightly higher due to the lower energy per gal of LP.

Onan spec sheet for that model is at
http://www.cumminsonan.com/www/html/...ets/a-1426.pdf

Other Onan model specs at:
Cummins Onan

[swamphog]

good ???, never thought to consider the amount of fuel being used in the generator, although when I start the MH up to run it for 10 mintues or so, I do start the generator too.

[dmason]

RV Roamer [Gary]: Thanks for the Onan link. It answered the same question about my QD 10000.

Other Onan model specs at: Cummins Onan

[Gary RVRoamer]

Generator fuel usage is typically quite small. If you are driving along with one a/c on, you are using maybe 1200-1500 watts, which is nowhere near 50% load, even on a 4000-5000 watt gas generator. The diesel gensets have even lower fuel consumption than the gas models.

It's enough to throw your mpg calculations off a bit, though.