[RE-wrenches] Generator Overvoltage Troubleshoot

[Mac Lewis]

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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