[RE-wrenches] Generator Overvoltage Troubleshoot

[Jim Gowdy]

That's a great idea and I will try that.  I have thought that a 240v
resistive load may not be the best test

On Fri, Jan 3, 2025 at 7:03 AM Jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> The normal generator test uses resistive loads which are easy for the
> voltage regulator.
>
> I’ve had success with problem generators by adding watts of resistive
> loads, space heaters.
> Worth a test.
> Because this generator is so large, might take 5k or more of heaters.
>
> Jay
>
> On Jan 3, 2025, at 7:53 AM, Jim Gowdy via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> 
> Thanks for that input, right now it's in Generator.  I was advised to try
> BACKUP, but the generator was running funny when I put it on that mode.  I
> will try that SUPPORT mode and see what happens.
>
> On Fri, Jan 3, 2025 at 6:34 AM Mac Lewis via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> What AC input mode are you using? I'd recommend trying various modes to
>> see if it will go away. I tend to use the support mode with the most
>> success.
>>
>> On Fri, Jan 3, 2025, 9:17 AM Jim Gowdy via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> Hi all,
>>>      I need some help with a generator overvoltage troubleshoot.  I'm
>>> working on an outback offgrid system that consists of 2 x Radian GS8048a, 1
>>> x MATE3S controller, 1 x FM 80 charge controller, 1 x 55kw single phase
>>> propane AC cummins generator, about 4kw of solar *not sufficient enough to
>>> keep up with the load, and 24 x 4v Rolls batteries series/paralleled to
>>> make 48v.  The generator was rebuilt and the batteries replaced about a
>>> year ago and since then, the generator has been faulting due to
>>> overvoltage.  I had help and first found that the MATE needed calibrating
>>> so that was done, but the generator still was faulting.  I found changing
>>> the AC Input Charging from 30a to 20a seemed to work.  I put a power
>>> monitor on the generator output and found that, with the AC Input Charging
>>> set at 30a, noticed that there was a voltage spike up to 300+V at about a
>>> 70a draw.  The generator company put a load bank on and verified the
>>> generator may not be at fault and the problem is after the generator.  Has
>>> anyone encountered a problem like this and have suggestions?  I've attached
>>> a PDF with a timeline of what I've done for troubleshooting so far.
>>>
>>> --
>>> Jim with Gowdy Electric
>>> Cambria, Ca 93428
>>> business  805 927 2630
>>> cell  805 975 5279
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>
> --
> Jim with Gowdy Electric
> Cambria, Ca 93428
> business  805 927 2630
> cell  805 975 5279
> _______________________________________________
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
>
> List Address: RE-wrenches at lists.re-wrenches.org
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-- 
Jim with Gowdy Electric
Cambria, Ca 93428
business  805 927 2630
cell  805 975 5279
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