Re: Cost of generation

Posted by MarkB_MI on December 10, 2013 at 02:40:29 from (75.198.70.217):

In Reply to: Cost of generation posted by David G on December 09, 2013 at 10:47:52:

One thing to remember is you won't be drawing anywhere near 38 kilowatts, but the tractor will still be using quite a bit of gas just to spin the generator. Gasoline engines are very inefficient at low power settings due to throttling losses; diesel engines are better but still need heavy loads for maximum efficiency.

I think our house is typical: gas baseboard heat, gas water heater and stovetop; everything else is electric including ductless air conditioning, oven, freezer and three (don't ask!) refrigerators. Our electric bill averaged 32 kW-hrs per day last year. So that's an average consumption of 1.3 kW.

I'm going to assume you need a lot more power since you bought a 38 kVA generator. Let's say you average around 4 kW. If you're producing 4 kW at 2 gph, your cost is a whopping $1.60 per kilowatt-hour. And that's just the cost of fuel; there's also maintenance and depreciation on the tractor and generator, which can be significant if both are new but you don't use them much.

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