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Fuel consumption

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Old 01-23-2006, 05:08:22 PM
Simple_serf Simple_serf is offline
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Thumbs up Fuel consumption

Awhile back, the question was raised about how much gas an onan Jc will use under light loads. Today we ran the 15JC under very little load (less than 1000W). This run was done as a maintenance test run. After running for 1/2 hour, this unit used less than 3 cubic feet. So about 6 cubic feet/ hr under little load. I am unsure what the pressure is at the wellhead, which is where the meter is at. Hope this helps a little.

The Simple serf
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Old 01-24-2006, 12:15:51 AM
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Jim McIntyre Jim McIntyre is offline
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Default Re: Fuel consumption

Let's see here... 6 cu ft/hour. Natural gas is about 1000 BTU/cu ft, so you're telling us the fuel input was 6000 BTU/hr.

Something's not quite right. The 15JC, even with no electrical load is going to need at least 10 times that.
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Old 01-24-2006, 12:41:39 AM
Simple_serf Simple_serf is offline
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Default Re: Fuel consumption

This is coming directly off the wellhead.

I do know that there is a regulator before the house. Because it isn't my house, I don't know what the pressure is going to it Because it is a different meter than I am used to, I may have misread it.

either that or the meter is shot.....I'd better look into this a little more

the simple serf
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Old 01-25-2006, 01:46:32 AM
Steve Dawkins Steve Dawkins is offline
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Default Re: Fuel consumption

Gunny or Billy J. might have some old JB and JC spec sheets in their archives. I used to have Onan catalogs that had cut sheets for each model they made. They provided a wealth of information including fuel consumption charts at 1/4, 1/2, 3/4 & full load. Unfortunately, I purged them from my library at the office after all these models became obsolete. Wish I'd kept one of the catalogs. I have a good relationship with the local Cummins distributor. They still have an old catalog and will let me copy whatever cut sheets I need. If Gunny or Billy doesn't have them readily available (sorry for volunteering you guys), I should be able to get them but it may take some time.
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