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Old 04-30-2012, 09:47 PM   #1
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Onan EC-30 problem

Have had our coach 2 years, going to Talladega for the races and decided to try out the auto setting on the generator. Problem is, we set the genset to auto, then hit enter, the genny tries to start, only cranks about 1/2 second, doesn't start, then kicks to manual. Have to hit auto and enter again to get it to start. But the setting always reverts back to manual. The batteries have a full charge, just can't keep the auto setting to stay on. Have called dealer and local cummins dealer, still waiting to get a call back from tech. Anyone had same problem?
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Old 05-02-2012, 07:47 PM   #2
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Sounds like your inverter may not be set to the auto starts liking.
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Old 05-02-2012, 08:28 PM   #3
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Read the manual. On mine I have to cycle the ignition switch before it will work.. Some others have a different safety measure.
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Old 05-02-2012, 09:41 PM   #4
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The operators panel can be used to determine why it did something like shutting down. See EC-30 manual for information (http://www.cumminsonan.com/www/pdf/m.../900-0541B.pdf)

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Old 05-02-2012, 10:32 PM   #5
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I had that problem on a former coach, turns out the batteries were in the back and the long run did not produce enough of a punch for the auto gen start to work most of the time. IF it started on a very quick turn of the crank it would start, otherwise it would quit and kick back to manual start. New coach has batteries up front and it works like a charm. Some guys have run bigger cables to the batteries to solve this problem and seem to have very good results. All just my experience and opinion.
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Old 05-03-2012, 08:02 AM   #6
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That's the same thing I went through. Our Allegro Bus has the batteries way in back and the EC-30 controls the 10KW generator, which is way at the front. The 2/0 cable wasn't adequate to crank the genset without a big voltage drop. It would crank manually with no problem (although a bit on the slow side) but the voltmeter would drop substantially. When the autostart was on, the EC30 would begin to crank it but the EC30 saw the low voltage and assumed that the batteries were too low so it aborts the autostart and kicks it into manual.

To correct this I added a designated battery up front just to crank the generator. I then connected a Trik-L-Start to allow the house charging system to maintain it's charge. Now the genset does not have a voltage drop, the EC30 is happy, and everything works as designed.

I just used your basic automotive cranking battery for this. The most time consuming was welding up a battery mounting plate to attach to the front frame rails.
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Old 05-06-2012, 08:24 PM   #7
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A real timely post. I have had previous posts on this topic and have been trying to get this fixed since September last year when onan replaced the EC 30. It started a couple of times only to revert back to its old ways. Sorry to hear that others have had the same problem but glad to hear that there are some fixes. Just got it back from a service location the past Thursday to have this fixed. The provider told me that onan tech rep came to his site and ultimately decided that it is a wiring problem and is a Winnebago problem. The mechanic at the providers location indicated just exactly what some posters here have stated. That is that the EC 30 is reading a false sense that the voltage is too low at the starter. He told me that he can fix it, but it would cost me about 8 hours at $90 per. Opted not to. I like the post about a starting battery dedicated to the genset. Does anyone have an idea though about why the auto start works as advertised when A/C thermostat calls for air?
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Old 05-07-2012, 07:29 AM   #8
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Just a guess on my part but I'm thinking that possibly the EC-30 only queries the battery voltage when it's asked to start due to reaching the low battery voltage threshhold. Maybe it does not query the voltage during a start request triggered by the thermostat?

Again, just a guess on my part. I've never actually tested that to prove or disprove that theory.
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