Posted by Dave G9N on July 23, 2023 at 17:06:27 from (24.220.196.59):
In Reply to: June 29, 95 mph winds posted by Geo-TH,In on July 23, 2023 at 03:42:39:
That was what is called an example. Examples are used to illustrate concepts.
There are many generators that give run time at several loads. The only reason I chose 100% efficiency was to get a ballpark number for the horsepower of the engine, which was not provided. Watts/750 = hp. I did say that the actual number would be different.
The engine does what engines do, and it was just an example that I had numbers for. Better quality engines just keep doing it longer and with fewer problems. Not the point here.
If you look at Nebraska Tractor Test Lab Test 443: Ford 8N you will see that an 8N putting our 2 hp consumes 2.928 gallons per horsepower hour, at 6.33 hp it is down to 1.161 gal/hp hr and at 24.93 it is down to 0.546 gal/hp hr. That is a low compression flathead, which is inherently less efficient than a high compression overhead valve engine, which gets all the way down to 0.5 gal/hp hr.
The mathematical relationship between run time and efficiency tells you that for any given load, a more efficiently operating engine will consume less fuel. Sizing the source to the load saves fuel.
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