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Old 07-14-2012, 10:03 PM   #1
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Battery voltage too high

We Have an Onan 2000 inverter/charger and I am getting a fault 29 - "battery voltage high" and inverter and charger shut down. This is a major fault so if you reset the charger twice it will clear but when you turn charger back on after about a minute you get the fault again. When I go to the battery bank I read 12.3 volts. I have never seen DC get stepped up so I think this is an inverter/charger issue. This started after the coach sat all winter and I found 2 of the batteries had "flipped" POS post was NEG voltage, the bank had been run you low. I replaced all 6 batteries and now have this, I am not sure if this started before the "flip" but I don't think so. I will call Onan on Monday but I am hoping someone can help!
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Old 07-14-2012, 10:05 PM   #2
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The Onan manual states high Voltage is greater than 15.5 volts.
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Old 07-15-2012, 12:43 AM   #3
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Since your batteries drained completely out, AND you had work done on your electrical system, IIWM, I'd check all the settings for the initial setup, especially Battery Type, charging settings, etc. I'd also do a full reset (at the inverter) to see if that helps.

Otherwise, Monday is only 25 hours away.......
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Old 07-15-2012, 10:33 AM   #4
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I ran through the set up and everything looked right. The only thing I have thought of that I have not done is remove the battery connections from the inverter, effectively doing the reset as you have suggested. The inverter is mounted so the battery terminals are very close to the divider wall of the engine compartment, the other thing I could do is disconnect the batteries but I thought that was the same as replacing the batteries. And as we know the battery cables are not easy to take off.
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Old 07-16-2012, 08:14 PM   #5
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You should be able to completely power batteries down from the battery compartment. Remove black combined ground cable from the start battery, then both chassis & house connections are now "open." Much safer.
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Old 07-16-2012, 08:44 PM   #6
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Mike that's the way I have been doing it, however I was not disconnecting the solar panels. Once I did that it resets inverter. Onan on the phone was not a lot of help today
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Old 07-16-2012, 08:45 PM   #7
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They told me it might be the inverter and to take it to a dealer and let them troubleshoot it.
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Old 07-16-2012, 08:53 PM   #8
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We are headed to northeast rally on Wednesday and will see who is there. If I have to replace the inverter I will replace the MSW for a full sine wave!
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Old 07-16-2012, 09:05 PM   #9
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If you do choose to replace, I'd recommend the Magnum MS-2012 with the standard ME-RC remote and the ME-BMK battery monitor kit (includes shunt). imarine had a very good price and charged just $9.95 shipping.
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Old 07-17-2012, 09:29 PM   #10
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As I understand it the Magnum is a modified sine wave, been there, done that, no thanks.
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Old 07-17-2012, 11:57 PM   #11
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Yes, stay away from any modified-sine (MS) models. That technology is old news. Not sure why anyone bothers to manufacture them anymore. They are just assisting in planned obsolescence for everything you attach to them and for themselves.
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Old 07-18-2012, 09:00 AM   #12
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I did say mS-2012, right? That's pure sine wave, 2kW, very sophisticated charging system (4 stage) - working very well for me. You're right, they do make modified sine wave systems too. All made in USA, so parts and service should be easier than the imports.
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Old 07-21-2012, 09:23 PM   #13
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DrDave, your inverter should be a full sine wave, since you have 2005. Must have been at the end of the 04 model year, and they had stuff left over. Magnum is the best, get the full sine wave model, at least 2000 watt, believe they make a 2800 which would be better for those mornings when you want coffee, and she want to dry hair. Although I would not do either on the inverter, I would start the genset. Now it could be in the Genset as well.
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