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Old 05-20-2022, 09:23 AM   #1
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Onan MDKBM-5747460 Fuel consumption

In actual use does anyone know fuel consumption for this Onan 11.5kw genset?
Thanks
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Old 05-20-2022, 09:28 AM   #2
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Depends on the load. 8 KW is about 1 gph. Itís pretty linear math calc.
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Old 05-20-2022, 12:20 PM   #3
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It’s a 11.5 kw. ?about the same? Anyone know for 11.5?

Thanks for the ballpark number HW. Wanted idle, half load, full load for 11.5kw
Last boat had a NL. It sipped fuel until full load.
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Old 05-20-2022, 12:33 PM   #4
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I was able to find an Onan spec sheet for that unit. The 11.5 MDKBM lists fuel consumption as 0.3 gal/hr at no load, 0.4 gal/hr at 25% load, 0.7 gal/hr at 50% load, 0.8 gal/hr at 75% load and 1 gal/hr at full load. The numbers look a bit more linear for the ones shown in liters/hour, so the gallons are definitely rounded.

Those numbers seem maybe a hair optimistic to me, but not unreasonably low. The 9.5kw / 50hz version of the unit lists a correspondingly lower full load consumption of 0.9 gal/hr.
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Old 05-20-2022, 12:41 PM   #5
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Thanks so much RS. Exactly the information wanted. Agree seems optimistic. For total trip calculation will use 1.2g/h. Still have ample reserves if I keep to ~7kts. Even f I need the SeaKeeper continuously on. Very humid and hot today in the chessie. Have AC on. Hopefully won’t need it once moving. Think in response to the jacked up fuel costs folks will cut down on discretionary draws. Use shore water instead of RO. Open hatches and have fans on instead of AC. Maybe even turn off ice makers, avoid Microwave and toaster use. I refuse to be uncomfortable if possible. Think when you’re comfortable you make better decisions. So will make a few concessions but not all I can think of. Biggest concession for us SD trawler types is to go slow.
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Old 05-20-2022, 12:51 PM   #6
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I wouldn't expect continuous full load, so even 1 gal/hr for average consumption is likely conservative.
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Old 05-20-2022, 01:05 PM   #7
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Rslifkin, can you post the link where you found those? I have 15kw gens and would like to see what they spec at. Thx.
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Old 05-20-2022, 01:18 PM   #8
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Quote:
Originally Posted by Juliet 15 View Post
Rslifkin, can you post the link where you found those? I have 15kw gens and would like to see what they spec at. Thx.
I just searched around for the model, kw output and then "spec sheet" and found a website that had it. I didn't stumble across a full listing of Onan spec sheets, unfortunately.
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Old 05-20-2022, 01:43 PM   #9
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Got it. I'll try the same. Thanks.
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