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Old 11-29-2015, 06:20 PM   #15
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I wanted to start my motorhome so bad since it has been so nice in Oregon, but after looking around the internet I read if your going to start it, drive it at least 25 miles don't bother starting until you use it in the spring.

I never thought about the generator, since it is diesel, I figured the same rule would apply. But it sounds like I should run it once a month.

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Old 11-30-2015, 04:50 AM   #16
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Starting engine during storage

Thanks to all for the feedback. I am going to leave the engine dormant for the winter, start the gen set on half load every month and extend the jack to keep weight of the tires.

Tom n Nancy, 2016 Itasca 40R, 2015 Jeep Wrangler
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Old 11-30-2015, 06:27 AM   #17
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Originally Posted by brian-nicola View Post
We winterize ours, diesel stabilizer, fill the tank, top off the batteries, plug it in, on her jacks and monthly check the water level in the batteries. My nephew who is a diesel tech says unless you are going to drive it...leave it alone.
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Old 11-30-2015, 06:34 AM   #18
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I start it and drive it for 30 miles/ at least 30 minutes every 3-4 weeks, but we are in north Georgia in a warmer climate and don't have to worry about road salt and snow 99% of the winter. Also run the generator under load per Onan operating instructions. Keep a full tank of fuel with diesel biocides also.

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Old 11-30-2015, 07:04 AM   #19
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Originally Posted by sbleiweiss View Post
I see this said (exercise the generator under load) all the time but don't understand why. I am not necessarily disagreeing, but would like to hear an explanation why under load is important. My observations that make me wonder are: 1) my home back-up generator automatically exercises once a week but doesn't do it under load (designed that way by the manufacturer); and 2: my MH generator does get up to operating temperature without being under load.

Your generator has two major components, the engine, and the actual generator. The reason you run it under load periodically, it to get the generator portion warmed up which in turn allows the electrical windings to thoroughly dry out. Moisture is the enemy of the varnish and coatings of the windings. If they are not periodically dried out, they will deteriorate and cause the generator portion of the "generator" to fail, even though the "engine" portion of the generator runs just fine.
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Old 11-30-2015, 07:54 AM   #20
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The running of the diesel Gen is not for the motor it is for the Generator portion to keep the moisture out. The half load creates heat in the Gen itself and at an hour under load the motor is warmed to operating temp as well.

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Old 11-30-2015, 08:01 AM   #21
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And I have to ask, in cold weather, when anything is hot and as it cools down, does it not attack the moisture in the air?
2000 Newmar MADP 4060, 350ISC, Spartan MM, IFS 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006Ultra & 1989 Springer
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Old 11-30-2015, 09:03 AM   #22
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Originally Posted by palehorse89 View Post
And I have to ask, in cold weather, when anything is hot and as it cools down, does it not attack the moisture in the air?
Please don't confuse people by stating scientific facts that contradict their long-held beliefs.
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Old 11-30-2015, 09:04 AM   #23
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Starting the engine: Unless you DRIVE it at least 30 miles do not bother,, In fact just starting and running it at full idle in many cases will do more harm than good. You have to get it up to operating temp and keep it there long enough to burn off volatile chemicals that contaminate the oil every time you start it. This takes running under load.. Same for the Generator I might add (once a month under 1/2 or greater load for 1/2 of longer hour.)

Plugging in.. Most modern RV's have good decent well regulate 1,2 or 3 stage converters. You can plug 'em in forever if you like (I do)

Some older ones have very poorly regulated converters like the Magnatek 6300 line. and those should not be plugged in months on end. NOTE: It is not the only bad one and I won't rule out a bad converter in a 2015 RV. But the converter maks the difference.

Mine is a Progressive Dynamics Intella-Power 9180 with wizard. Took a full year to "Boil the batteries" to the point where I needed to add Distilled Water.. NOT DRY mind you, just thirsty. That was with the original battery bank.. I'm at aroudn 19 months on the new battery bank and have yet to add distilled.. Checking often (New Batteries are bigger) The old ones by the way lasted 9 years.

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