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Old 08-15-2005, 07:24 PM   #1
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Is it normal for an Onan BGE 4,000 Watt generator to produce exactly 12 Volts at the coach batteries? The engine alternator produces about 13.5 Volts at the same batteries (which are not holding charge & need replacing). I would expect the generator to produce about the same. Thoughts?

Dave
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Old 08-15-2005, 07:24 PM   #2
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Is it normal for an Onan BGE 4,000 Watt generator to produce exactly 12 Volts at the coach batteries? The engine alternator produces about 13.5 Volts at the same batteries (which are not holding charge & need replacing). I would expect the generator to produce about the same. Thoughts?

Dave
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Old 08-16-2005, 12:25 AM   #3
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The generator should produce 120 volts ac and the converter or inverter/charger should be the component to recharge the batteries. Check to be sure the circuit breakers are not tripped or off at these devises. Make sure also there are no blown 12 volt fuses. What kind of voltage are you getting to the coach batteries when plugged into shore power? Are you getting 120 volt from generator into the coach; does the air cond come on? Let us know a few more details where we can be of more help.
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Old 08-20-2005, 12:08 PM   #4
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Mike - Thanks much for your response! I've checked breakers & fuses and all are functioning. With the coach plugged in, I show a bit over 13 volts at the coach battery terminals. The engine alternator produces approximately the same. That's why I'm a bit confused about the generator only producing 12 volts. Is there a way to adjust generator voltage? I checked my Onan manual, to no avail.

Thanks in advance,

dave
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Old 08-20-2005, 01:10 PM   #5
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Dave,
As Mike stated an Onan genset does not supply any dc power output. The only thing that comes from your Onan is 120V-ac power. When you run the Onan is should supply power to the converter, or inverter if you have one and they are the source of the 12V-dc power to supply the RV and to recharge your coach batteries. If all of the other 120V appliances work when running the genset, then there is some other problem. Either shore power or the genset supplies power to the transfer relay if you have one, or to the power cord if you do not. From there the power goes to the 120V distribution panel exactly the same no matter which source is supplying the power. If you see a different voltage on the battery terminals there is some other problem. I would lift the cables from the battery to take it out of the circuit. Then check the voltage between the two cables when on each source. In that way you can be sure that the battery is not a factor.
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