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Old 05-20-2010, 07:01 PM   #1
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Generator Voltage fluctuating 3 to 6 volts

Just noticed that my Onan 7000 voltage is fluxuating between 114 and 120. What is the problem?

Woodyk
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Old 05-20-2010, 07:51 PM   #2
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First what are you using to read the voltage? If it is an inexpensive meter, I'd not trust it until it was compared to a higher quality meter. Is the fluctuation under load, lightly loaded or no load?

Ken
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Old 05-20-2010, 10:07 PM   #3
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My Onan 6500 propane generator does exactly the same thing.
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Old 05-21-2010, 06:26 AM   #4
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I've got a digital multimeter--also the plug in type from Camping World. When under shore power both are steady at 122--when I start up the gen I get the fluxuation--it both reg load and under load. When I first noticed it on the CW monitor I then used my digital to see if it still fluxuated and it did. Thats when I put it under heavy loa turn on my water heater and both AC and it still did the same thing. I was reading somewhere here in irv2 that when the voltage fluxs there was something wrong but I couldn't find it again. Did a search and still for generator voltage fluxuating and still not luck. Any suggestion on what could be the problem. Would like to get it fixed befor my next trip.

Woodyk
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Old 05-21-2010, 06:33 AM   #5
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That is not normal and needs to be addressed. If the engine doesn't sound like it is surging higher and lower then I would suspect something related to the voltage regulator.
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Old 05-21-2010, 04:01 PM   #6
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I agree that is not right. At any given load the voltage should be steady. It will vary a bit from no load to full load, but ought to remain steady at any point in the range.

RMS voltage & frequency both depend on RPMs. The voltage regulator is supposed to adjust engine to produce the right RPMs to deliver the correct voltage and frequency.
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Old 05-21-2010, 04:36 PM   #7
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JMHO not a problem.

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Old 05-21-2010, 04:48 PM   #8
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The poser should be more steady than that when viewed with a volt meter. Time to get the genny checked at a good shop.

Ken
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Old 05-21-2010, 05:22 PM   #9
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Digital meters are not really good at checking voltages that change frequently. You need to have a good analog meter or scope to read this correctly.

If the voltage is really changing that much, a good service tech is needed. There's no user adjustments, proper equipment is required. That much change may not harm anything but with todays electronics, I wouldn't take the chance.
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Old 05-21-2010, 06:10 PM   #10
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Check for arcing at the slip rings in the pitch darkness of night. There should be none.
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