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Old 29-09-2016, 13:57   #16
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Re: Onan stumped the chump

Well as a kid playing with electronics I ran DC through a vibrator which made it then pulsed DC, that you could run through a transformer as it acted like AC, but it's still DC


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Old 29-09-2016, 13:57   #17
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Re: Onan stumped the chump

Why not just run a small charger off of the AC output?


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Old 29-09-2016, 14:23   #18
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Re: Onan stumped the chump

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Well as a kid playing with electronics I ran DC through a vibrator which made it then pulsed DC, that you could run through a transformer as it acted like AC, but it's still DC


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Sounds like a great idea today. Maybe a square wave?
Just not germane to the OPs problem.
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Old 29-09-2016, 14:32   #19
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Re: Onan stumped the chump

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Well as a kid playing with electronics I ran DC through a vibrator which made it then pulsed DC, that you could run through a transformer as it acted like AC, but it's still DC


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The the shaking of the vibrator changed the velocity of the electrons and made pulsating DC? Cool.
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Old 29-09-2016, 15:45   #20
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Re: Onan stumped the chump

Vibrator of course was the device that rapidly made and broke the circuit was called from its sound, it vibrated.
If you have ever been around some of the magneto systems that had a "shower of sparks" you have heard the buzz, that was from the vibrator.
If I were the OP, I'd likely bail and just go with another AC charger dedicated to the start battery, although a couple of diodes ought to work, and maybe the resistor Chrysler automobile had on their firewall to reduce running voltage for their ignition could would work too, I believe they reduced 14 VDC to 12.
Look up Chrysler ballast resistor.

But I guarantee a second AC charger will work


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Old 29-09-2016, 15:55   #21
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Onan stumped the chump

https://en.m.wikipedia.org/wiki/Vibrator_(electronic)


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Old 29-09-2016, 16:08   #22
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Re: Onan stumped the chump

Onan lists high battery voltage as 19.2 volts for more than 1 second.

Your regulator should be a 305-1006 rated at 10 amps. As far as I can see they don't make an AGM rated regulator.

I'm not sure what your using for a meter but I just checked a running generator at the shop with a lead acid battery and I'm getting 14.8 VDC on my fluke meter and that's considered a "normal" reading.
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Old 29-09-2016, 19:49   #23
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Re: Onan stumped the chump

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Hi Bill,

Where are you checking to see the high voltage, at the regulator output or at the battery terminals or is it the same at both?


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It's the same.
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Old 29-09-2016, 19:54   #24
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Re: Onan stumped the chump

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Originally Posted by a64pilot View Post
Why not just run a small charger off of the AC output?


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That's not a bad idea. My house bank battery charger uses very little of my AC and even when I'm using the genset to make water or wash clothes there is plenty of AC left over to run a small charger.
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Old 30-09-2016, 05:25   #25
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Re: Onan stumped the chump

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It's the same.
I was pretty sure you had checked this but had to ask. Was hoping for an easy answer IE some drop between the alternator and batteries. Oh well.

My best guess at this point is the new regulator isn't right.
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Old 30-09-2016, 05:31   #26
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Re: Onan stumped the chump

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My best guess at this point is the new regulator isn't right.

With two of them now operating almost identical, I'm thinking the voltage on the winding is high, previous owner may have cooked three batteries before he finally disconnected, Bill checked

I know it goes against conventional wisdom, but I only have two banks on my boat, and I gang them into one, but then I only have one fuel tank and one water tank too
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Old 30-09-2016, 05:33   #27
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Re: Onan stumped the chump

I'd be tempted to use a battery tender as a starting battery just isn't discharged much and a battery tender is good for floating a battery forever.
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Old 30-09-2016, 06:40   #28
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Re: Onan stumped the chump

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With two of them now operating almost identical, I'm thinking the voltage on the winding is high, previous owner may have cooked three batteries before he finally disconnected, Bill checked

I know it goes against conventional wisdom, but I only have two banks on my boat, and I gang them into one, but then I only have one fuel tank and one water tank too
I checked the ac voltage from the winding and it is 22V. The problem is I don't know what the spec is and neither does the local Onan shop. They tried to look up the spec for the regulator output and their documentation didn't tell them either. I can't find a tech support number for Onan that has a human connected on the other end.
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Old 30-09-2016, 14:38   #29
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Re: Onan stumped the chump

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I checked the ac voltage from the winding and it is 22V. The problem is I don't know what the spec is and neither does the local Onan shop. They tried to look up the spec for the regulator output and their documentation didn't tell them either. I can't find a tech support number for Onan that has a human connected on the other end.
This regulator is used in hundreds of aplications from lawn mowers to generators like yours.
From what I can gather it will accept a wide range of AC input voltages with out much trouble. Normal range seems to be from 18 to 28 volts. Onan uses the same stator and core on the 50htz model and just set the RPM lower. In these aplications the regulator sees voltages on the lower end of the range.

22 VAC seems very good. I would try a lead acid battery if you can. One other test is open the generator AC load breaker and see if anything changes. This rules out your charger/inverter from the equation.. Simple but often overlooked.
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Old 30-09-2016, 14:48   #30
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Re: Onan stumped the chump

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Originally Posted by dave948 View Post
This regulator is used in hundreds of aplications from lawn mowers to generators like yours.
From what I can gather it will accept a wide range of AC input voltages with out much trouble. Normal range seems to be from 18 to 28 volts. Onan uses the same stator and core on the 50htz model and just set the RPM lower. In these aplications the regulator sees voltages on the lower end of the range.

22 VAC seems very good. I would try a lead acid battery if you can. One other test is open the generator AC load breaker and see if anything changes. This rules out your charger/inverter from the equation.. Simple but often overlooked.
I found an email address for Onan and sent them a note late this morning. This afternoon i got the spec's for the voltage regulator and the specified input voltage is 17-19V. Mine was 22 Volts. Now the question becomes did I measure it properly. I disconnected the AC lines and measured the voltage with no load on them. I'm wondering if it might have been different if I had measure it while they were still connected to the regulator. The output spec is 14.4 volts. All of the tests were conducted with the the main AC breaker in the off position.
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