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<p>Reading that the problem started AFTER the gen set was rebuilt,
seems to point to adjusting generator voltage and frequency set
points, or a faulty voltage regulator. My guess is something went
wrong with the rebuild. Unless it was factory rebuilt, I've found
local generator service companies to be overall fair to bad. All
the knowledgeable old timers are retiring, replaced with younger
folks that mostly are there to just collect a paycheck. My
experience with gen sets that start having trouble, is they have
to be replaced. I just haven't seen them ever be reliable again,
once they start needing work. <br>
</p>
<p>As soon as the gen set service company hears "Solar", they pin
the blame on us, and to be fair, Inverter battery charging is a
tricky load. <br>
</p>
<p>Ray Walters<br>
Remote Solar<br>
</p>
<div class="moz-cite-prefix">On 1/3/2025 1:21 PM, Blair May via
RE-wrenches wrote:<br>
</div>
<blockquote type="cite"
cite="mid:96669FE7-630C-459F-8FDF-037B59325CB4@gmail.com">
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What IS the AC output prior to connecting to the Inverters? Hzs?
Is the generator an older unit w/ mechanical speed controls? 55kW
gen set should have no problem that load and the OV will usually
occur during the disconnection phase not once loaded. <span
data-huuid="289170847006211998" class="">On a generator, the
"Gain" setting controls <mark class="QVRyCf">the sensitivity of
the voltage regulator</mark>, essentially determining how
quickly the generator responds to changes in load by adjusting
the excitation current to maintain a stable output voltage; </span><span
data-huuid="289170847006209433" class="">a higher gain means a
faster response to load fluctuations, while a lower gain results
in a slower response, potentially leading to larger voltage
swings under changing load conditions. TUMP</span>
<div class=""><br class="">
<span data-huuid="289170847006209433" class=""><span
class="UV3uM"></span></span>
<div class="">
<div class="">
<div>
<blockquote type="cite" class="">
<div class="">On Jan 3, 2025, at 3:01 PM, Jerry Shafer
via RE-wrenches <<a
href="mailto:re-wrenches@lists.re-wrenches.org"
class="moz-txt-link-freetext" moz-do-not-send="true">re-wrenches@lists.re-wrenches.org</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div dir="auto" class="">I work with gen set and
inverter integration all the time, unless you have
an inverter beginning to fail, it has to be the gen
set, when l run load banks it for 2, 4 hr. or even
longer and the voltage may only be checked at
intervals and not continues. Use a fluke or other
high quality meter set to min max and test all the
integration, now the inverter may be pushing back
spikes. You should also be able to tune in voltage
at the gen set regulator, it can set volts and freq.
<div dir="auto" class="">Fun times</div>
<div dir="auto" class=""><br class="">
</div>
</div>
<br class="">
<div class="gmail_quote gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Fri, Jan 3,
2025, 6:17 AM Jim Gowdy via RE-wrenches <<a
href="mailto:re-wrenches@lists.re-wrenches.org"
class="moz-txt-link-freetext"
moz-do-not-send="true">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br class="">
</div>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr" class="">
<div class="">
<div class="">Hi all,</div>
<div class=""> 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.</div>
</div>
<div class=""><br class="">
</div>
<span class="gmail_signature_prefix">-- </span><br
class="">
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr" class="">Jim with Gowdy
Electric
<div class="">Cambria, Ca 93428</div>
<div class="">business 805 927 2630</div>
<div class="">cell 805 975 5279</div>
</div>
</div>
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