gas fired gen

The fuel consumption will vary with load, though the variation may not necessarily be linear. Contact the manufacturer for the best advice.

I recommend that you contact General Electric (GE) with all of the pertinent information. We are not GE. We do not know anything about your specific generator nor do we have any responsibility or authority for this generator. We do not know if your gas fired generator will use gasoline, natural gas, propane, methane, hydrogen, acetylene, coal gas, or anything else that could be considered gas. I certainly do not care. I would expect that a 10% load will consume less fuel than a 90% load, but I would not expect there to be a linear relationship between the two fuel rates. There maybe a linear relationship with an offset but I would not count on my word for your budgeting calculations.

Actually I would not count on GE's word either. I would install sufficient instrumentation to measure the electric load and the fuel consumption rate. I would then measure your installation fuel consumption rates versus electric loads over time. I would likely set the initial installation results as the reference flow rates to set the bar for future comparisons.

PWSlack and redfred have both given excellent advice. As redfred says, the manufacturer's information may not be all that accurate (they will provide the most optimistic information they can because they want you to purchase their product). A good source of information would be someone who already owns and operates a similar unit and has the operating data you seek.

The following approximations may be used for a VERY rough budgetary estimate The numbers are based on my experience with units from the 1960's-1980's; modern units with tighter emission controls may be different.

• For a reciprocating piston-type engine, fuel consumption at idle (running with no load) is around 15% of full load. The consumption curve is a fairly linear increase of about 60% from idle up to around 90% load. Most engines are tuned for maximum efficiency at that point. The top 10% loading takes about 15% of the full load fuel rate.
• For a combustion turbine, idle consumption is about 40%, and the curve is essentially linear from idle to full load.

See Chart, it'll give you some sort of idea.

thank you every body. nice information.

ill try to contact GE. otherwise generator will run on natural gas.