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Old 01-21-2014, 08:58 PM   #1
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Gen fuel usage

I think I might be confused on fuel consumption rates with the 450 AH system and our 12.5KW gen. Before I respond to another thread, I want to seek clarification on the genny fuel use. Can you tell me approx. diesel usage per hour for the system running continuously? Does the load on the unit effect the fuel consumption? So if all the a/c units are running non-stop, is that fuel consumption rate different than just say some courtesy lighting on and gen running?


Ron.
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Old 01-21-2014, 09:38 PM   #2
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Somewhere I read .5 gal/hr to run the genny. I can't remember if that was at 50% or 75% load.
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Old 01-21-2014, 09:48 PM   #3
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According to page 5.1 of the Onan Genset owners manual, gph is as follows:

No-load = 0.11 gph
Half load = 0.48 gph
Full load = 1.2 gph
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Old 01-21-2014, 10:01 PM   #4
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it DOES depend on the load on the gen set. However, at a little over 50% load (2 AC, not much else) mine will burn a little less than .5 gph. And that will vary depending on the outside temp and where the Acs are set. All just my experience.
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Old 01-21-2014, 10:01 PM   #5
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This is a spec sheet for a Cummins 10.0/12.5 quiet diesel.

http://www.americanrvcompany.com/ass...nan/a-1483.pdf

the 12.5 KW version uses about .5 gal/hour at 50% and 1.2 gal/hour at full load. They both use about .1 gal/hour idling with no load.

For the most part, it is not likely you would exceed .5 gal/hour while on the road, at least not on average. Your fuel gauge and fuel calculators will not be able to calculate out the fuel burn for the gennys from that for the engine. So, if your fuel computers says you are getting 9 MPG and you have been running the genny you are actually getting more MPG out of the engine.

BTW, I don't think you will normally run more than 50% on average. To significantly exceed that you would have to parked, boon docking, running 3 AC units at the same time, all the lights on.

To put this in perspective, to max out my 8.5 KW unit (Approx. 60 A/30A per leg) I had to fire up 2 ACs, all my lights, electric water heater, block heater, 3 TVs, 2 Sat receivers, forced my residential refer into speed cool and freeze and a few other things.
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Old 01-22-2014, 10:51 AM   #6
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Quote:
Originally Posted by Sky_Boss View Post
This is a spec sheet for a Cummins 10.0/12.5 quiet diesel.

http://www.americanrvcompany.com/ass...nan/a-1483.pdf

the 12.5 KW version uses about .5 gal/hour at 50% and 1.2 gal/hour at full load. They both use about .1 gal/hour idling with no load.

For the most part, it is not likely you would exceed .5 gal/hour while on the road, at least not on average. Your fuel gauge and fuel calculators will not be able to calculate out the fuel burn for the gennys from that for the engine. So, if your fuel computers says you are getting 9 MPG and you have been running the genny you are actually getting more MPG out of the engine.

BTW, I don't think you will normally run more than 50% on average. To significantly exceed that you would have to parked, boon docking, running 3 AC units at the same time, all the lights on.

To put this in perspective, to max out my 8.5 KW unit (Approx. 60 A/30A per leg) I had to fire up 2 ACs, all my lights, electric water heater, block heater, 3 TVs, 2 Sat receivers, forced my residential refer into speed cool and freeze and a few other things.

Don,

Great info and gives me a good baseline.

Thank you, Ron.
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