[RE-wrenches] Generator overvoltage troubleshoot

[Mac Lewis]

Hi Jim,

I think the voltage regulator on the generator is the issue, but you may be
able to fix it by trying a different AC input mode.  What is the AC input
mode are you using on the Radians?  Are the modes the same on each Radian?
Since you have a range of input that you can get it to hiccup, I'd try
playing with the AC input modes through the problematic range.  I tend to
use support mode with the least trouble.

What are the downstream loads?

I could see perhaps how a downstream load that is large and inductive and
shuts down rapidly could cause a voltage spike, but really the voltage
regulator is in charge of that.

ANother thing to check is torque/corrosion on your connections.  I like to
use an IR camera to speed up looking for connection issues.

Let us know what you find out.

On Fri, Nov 8, 2024 at 9:34 PM 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 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?
>
> --
> Jim with Gowdy Electric
> Cambria, Ca 93428
> business  805 927 2630
> cell  805 975 5279
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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