[RE-wrenches] Generator Overvoltage Troubleshoot

[Dana Orzel]

I’ve chimed in on this connection before I have an Onan 20 KW an  analog unit - 25 years old and I had it completely rebuilt prior to moving to Idaho and then after a couple of years, the voltage got really unstable. I dealt with ASAP they got me a they got me a replacement new not ORM voltage regulator that has been absolutely perfect
Here is their phone number these guys were super super helpful.

(717) 274-9396

Dana Orzel
C: 208.721.7003
E- dana at solarwork.com

On Jan 3, 2025, at 1:52 PM, Darryl Thayer via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:


Here is my two cents I had a similar over voltage. It was caused by the generator. It helped to put a load on the generator, I put on a 500 watt resistance load, it helped but in the end the generator was replaced.  Good luck.

On Fri, Jan 3, 2025, 8:17 AM Jim Gowdy via RE-wrenches <re-wrenches at lists.re-wrenches.org<mailto: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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