Generator Fuel Rules of Thumb [RE-wrenches]

[Steve Willey, Backwoods Solar]

Information I have from Kohler in writing, as well as the local propane
dealer, says 36.39  cubic feet of propane at working pressure and 60 degrees
is a gallon. Other posts here were claiming 154.3 cf per gallon so I took a
day to check these sources before replying again.

I assume they are measuring it at the appliance working pressure of about
1/2 pound, though this is not stated.

That means a 10 kilowatt generator, like the 10RY on propane LP fuel, uses
about 2 gallons per hour at full load, a figure that seems more proportional
to experience.  Perhaps the 154.3 cubic feet per gallon applies to natural
gas where more must be used to equal the same energy?

Steve Willey   www.backwoodssolar.com
Backwoods Solar Electric Systems
A catalog business on a mountain
2 miles from utility lines,
powered entirely by our catalog products.
IF UTILITY POWER IS 1/2 MILE OR MORE FROM YOUR SITE,
get our free 160 page solar-electric Planning Guide/Catalog.
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Phone(208)263-4290  Fax (208) 265-4788  in Idaho, USA


----- Original Message -----
From: Chuck Heath, SunPower <sunpwr at jps.net>
To: <RE-wrenches at topica.com>
Sent: Tuesday, June 06, 2000 7:21 AM
Subject: Re: Generator Fuel Rules of Thumb [RE-wrenches]


> On 6/2/00, Steve Willey said...
> >We sell 10 RY, larger engine low rpm, but I believe the power usage at
75%
> >load would be about twice what you figured.  The 154.3 cu ft per gallon
> >looks wrong, wasn't it somewhere around 45?
>
> According to the Kohler spec sheet, a 10RY operating at 60 Hz. consumes
> LPG cfh at % load:
>      100%     68
>       75%     54
>       50%     44
>       25%     35
>
> My notes from other sources also say to convert LPG cu. ft. per hour to
> gallons per hour, divide by 154.3.
>
> Hope this helps.
>
> Cordially, Chuck
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