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Onan Generators

What Have You Done to Your Onan Generator Today?


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  #1801  
Old 08-18-2015, 07:57:57 PM
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BigBlockChev BigBlockChev is offline
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Default Re: What have you done to your Onan generator today?

Load tested my DKC 4.0 for an hour today. Burned through 1.35L of fuel with 2800W of load , most I could get with this wiring configuration. Held rock solid at 58.6 Hz , temps held good and no leaks. I am trying to decide which of my 3 Kubota powered gens to keep, this one , my DKD 7.5 or my 7.0Kw mystery Kubota/Lima marine gen. I did a test a few years ago of my household loads during an outage and found that 3 kw would be enough to satisfy our needs, so any of the three should be enough. Cheers Dan
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  #1802  
Old 08-18-2015, 09:13:10 PM
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Default Re: What have you done to your Onan generator today?

Quote:
Originally Posted by BigBlockChev View Post
Load tested my DKC 4.0 for an hour today. Burned through 1.35L of fuel with 2800W of load , most I could get with this wiring configuration. Held rock solid at 58.6 Hz , temps held good and no leaks. I am trying to decide which of my 3 Kubota powered gens to keep, this one , my DKD 7.5 or my 7.0Kw mystery Kubota/Lima marine gen. I did a test a few years ago of my household loads during an outage and found that 3 kw would be enough to satisfy our needs, so any of the three should be enough. Cheers Dan
I'm glad you have to make that choice I wouldn't want to make it they all sound good to me.
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  #1803  
Old 08-19-2015, 11:32:27 AM
Ted_Cool Ted_Cool is offline
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Default Re: What have you done to your Onan generator today?

I've got a 7.5KW Kubota diesel that sips fuel. My family sure likes it when we can run the water heater OR the microwave oven OR the stove during an outage. I've even done laundry. Just not all at once.

I fire up the JC when I want to do it all.

I do sometime run the MDJA for overnights, but just leaving the Kubota on is tempting...
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  #1804  
Old 08-19-2015, 12:11:36 PM
len k len k is online now
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Default Re: What have you done to your Onan generator today?

I think diesels burn almost nothing at no-load. On gasoline no-load usage is a big waste and killer on the wallet, like for overnight usage. It really surprised me when someone posted how little a MUCH larger HUGE diesel burned at no-load.
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Old 08-19-2015, 12:28:36 PM
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Default Re: What have you done to your Onan generator today?

Depends by what you mean by "almost nothing". I'm attaching some measured data that shows no-load consumption for a big Kubota tractor is about 30% of full load. With gas engines I've seen the no-load consumption isn't that much worse - maybe more like 40-50%.

Anyone got links to actual measured data? (Rules of thumb starting to tick me off...)

[rant off]

Something to keep in mind with a genset is that even with no electrical load on the generator, the engine still has significant load - it's driving the generator cooling fan, the engine cooling fan, possibly a water pump, and most of all, the generator excitation power still needs to be developed (and subsequently wasted in the generator itself.)
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Old 08-19-2015, 12:50:34 PM
JohnnyC JohnnyC is offline
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Default Re: What have you done to your Onan generator today?

This morning the power went out at the house. First thought was my JC . Since the weather is very nice (not freezing or 100000 degree F - actually 78 degrees outside) I did not hurry to go drag the 700 lbs beast from storage. Within 5 minutes the grid power came back on. I spent the next 15 minutes resetting all the f*&ck'en digital clocks

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Old 08-19-2015, 01:02:07 PM
len k len k is online now
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Default Re: What have you done to your Onan generator today?

About a month or 2 ago someone posted with a ~ 100kw diesel. I extrapolated for size from 15 kw JC gasoline consumption of 1 gal/hr non-load and estimated it might burn ~ 6 gal/hr non-load if it were gasoline engine. Think they said it burned something like ~ 1/2 gal/hr. Made me very impressed with a diesel.... once you get it started in winter.
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Old 08-19-2015, 01:14:05 PM
85lebaront2 85lebaront2 is offline
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Default Re: What have you done to your Onan generator today?

Not today, but yesterday I pulled the blower housing and flywheel off the old 305CCK and took some pictures and labeled them of the strange magneto ignition system on these for another member on here. After that, and measuring some resistance and stator output with the plugs removed, I put it back together and started it, back where it used to be, fired on the first pull.
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  #1809  
Old 08-19-2015, 01:49:32 PM
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Default Re: What have you done to your Onan generator today?

In order to be accurate I weigh the quantity of fuel used on my Safeway digital food scale like they have at the deli ( accurate to +-5 grams and formerly legal for trade) and use use the Killawat meter to check volts, amps, and watts to crosscheck. I also check that against my multimeter periodically. I realize that in many cases it is not going to be possible to do this. I am going to try to build up a database of fuel/watthours with different machines. In order to do this I am trying to use the same methodology for each test to give valid results 1 hour test , weigh fuel before and after, crosscheck against reasonably accurate electrical readings. Cheers Dan

The figure that we used for our large hospital gensets 500Kw -1.3Mw was 6 gals per hour per 100Kw of actual load. We had to calculate the available runtime based on the amount of fuel storage we had for Post disaster purposes and refueling requirements during long shutdowns. We did not have consumption figures for no load since we would never run that way for any lenght of time. For the most part this was accurate enough for our purposes but did not exactly reflect the specific consumption of different size or make of units. We had a variety of Cummins, Cat, Detroit, and MTU, and even an old Dorman generators in 12Kv, 4160V, and 600V.
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Last edited by BigBlockChev; 08-19-2015 at 02:02:31 PM.
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  #1810  
Old 08-19-2015, 08:33:08 PM
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Default Re: What have you done to your Onan generator today?

Quote:
Originally Posted by len k View Post
About a month or 2 ago someone posted with a ~ 100kw diesel. I extrapolated for size from 15 kw JC gasoline consumption of 1 gal/hr non-load and estimated it might burn ~ 6 gal/hr non-load if it were gasoline engine. Think they said it burned something like ~ 1/2 gal/hr. Made me very impressed with a diesel.... once you get it started in winter.
Huh? Are you saying you believe that an unloaded 100 kW Diesel set uses 1/2 GPH? THAT seems to good to be true...

Heck - My MEP-004 uses close to that unloaded, and it's basically a 20 kW set.
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