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Old 11-18-2015, 06:59 PM   #15
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Originally Posted by gsander1 View Post
My 12.5KW Onan starts just fine down to 12.0 VDC.
I agree something does not seem right. This particular generator always cranks slowly... kind of a chug, chug, chug, then it fires up. It always sounds like it doesn't want to start even when it does. It is going to have a 1,000 hour service which will include valve lash so I will ask them to check everything else. I really don't want to add another battery. My house bank should be sufficient.... six 6 volt AGM 224 hr batteries.
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Old 11-18-2015, 08:52 PM   #16
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How about hitting the boost button and connecting the chassis and house batteries to start the generator?

The 10K has the Kubota engine and mine also "chug-chug-chugs" before starting. I am wondering what the starter draws (amps) for this combination. For others, does the 12.5KW QD have the same engine/starter setup as the 10KW?

Wondering...
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Old 11-19-2015, 11:18 PM   #17
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I have a 12.5 generator. It starts fine on 12V or more if temp above 45-50F. If cold and I hear any hesitation to the generator starting I hit the batt boost button. Then it fires right away.

If you ask five people what you should set your auto generator settings at you will get five answers. And BTW a few years back Kevin Waite gave me his opinion. After using our coach for 6 1/2 years I set the auto gen start at either 11.9 or 12 if 50F or above temp. Below that I would go up to 12.2 or 3. In my humble opinion you have some other issue with the generator if it will not start with 12.2V.

I installed two solar panels about 3 years ago to solve the parked battery run down problem. It did. To get the least amount of drain I turn off the salesman switch and then make sure both inverters are off and both chargers (I have an all electric coach).

I don't think you can park these things for long periods without the batteries going down unless you are plugged in.
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Old 11-20-2015, 11:17 AM   #18
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It sounds like, in this small sample, that the Onan starts better than the Powertech generator.

I can relate to the Kubota "chug, chug" start scenario on my 7.5Kw Powertech.

My Cummins fires instantly. Not the Powertech.

I have a dedicated 12v generator starting battery, no AGS, and two ways to boost the generator start function.

But all power sources still have the "Chug, Chug" event plus the requirement to Pre-Heat the generator for 15 seconds.
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Old 11-20-2015, 12:09 PM   #19
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My 10K Onan has the "chug-chug" issue also and I have had to either start the engine or use the boost to start the genset. Not sure what the voltage was now though.
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Old 11-20-2015, 02:31 PM   #20
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my 8kw powertech with kubota engine starts fine at 12v but i am using a different type of batteries. sometimes it chugs, a few times i had to try the second or even the third time.
i guess voltage is just one dimension of the story, the size of the battery pack (the volume of the pond) also plays a role.
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Old 11-20-2015, 07:53 PM   #21
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My 8kw Onan always chugs 3 - 4 times then fires up. I have always figured that is the time it takes to get fuel from the tank. Anyway it starts at 12.8 volts each time. It will still chug when we pull into a rest stop for lunch even though we have been driving for a few hours. When I shut it down it cycles a couple of times then quits. I assume it sucks down the diesel at that point.
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Old 11-20-2015, 08:29 PM   #22
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FWIW I wonder if the first couple of chugs preheat the cylinders as the fuel starts to burn but does not do well enough to run.
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Old 11-20-2015, 09:08 PM   #23
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I also wonder if the AGS, which I do not have, executes any preheat function when attempting to start the generator?
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Old 11-21-2015, 07:06 AM   #24
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I also wonder if the AGS, which I do not have, executes any preheat function when attempting to start the generator?
The preheat function is part of the start sequence by Onan. Even when I have full battery power, if the AGS initiates a start, I can hear the rapid clicking associated with preheat. I guess what the AGS really does is the same as pressing a start button.

I had the Onan EC30W AGS on my previous coach and it worked the same way.
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Old 11-22-2015, 03:54 PM   #25
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Here is a picture of battery I installed in the generator compartment. , no problem in over 3 yrs.
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Old 11-23-2015, 07:49 AM   #26
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Here is a picture of battery I installed in the generator compartment. , no problem in over 3 yrs.
That pic is worth a thousand words. That looks pretty easy to do.

Do you remember the CCA spec for that battery?
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Old 11-23-2015, 09:09 AM   #27
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I found the spec sheet for Onan 8K quiet diesel and it lists as an accessory
a 12 volt battery with CCA 475. (P/N 416-0795)

I would think anything this size or larger should be fine.
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Old 11-23-2015, 08:02 PM   #28
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That pic is worth a thousand words. That looks pretty easy to do.
You will then need to wire your AGS to the new starting battery to make it useful.......
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