[RE-wrenches] Gen set problems

[Mick Abraham]

Try tweaking upward on the voltage at which the system disconnects from gen.
I can't remember exactly in the Mate where that is found..."AC Input" may be
the heading.

I believe the preset for that is 108 volts per leg or other fairly low
number. If the inverter stack waits for the generator AC to collapse to such
a low level before doing the transfer, that may be why the loads you mention
are acting strangely.

Jolliness,

Mick Abraham, Proprietor
www.abrahamsolar.com

Voice: 970-731-4675


On Mon, Jun 14, 2010 at 11:31 PM, William Miller <william at millersolar.com>wrote:

>  Wrenches:
>
> I have a customer that has a problem with a new generator.  He has two
> VFX3648 inverters in Outback stacking.  He acquired a new generator, a
> Kohler 12RES, a reputable make and model.  Below is a description of the
> problem:
>
> *The 12RES seems to be operating OK except for one problem.  At the end of
> a charging cycle, when the gen automatically shuts down and load goes back
> to the inverters, all lights, TVs, etc., flash, one TV shuts off, and a GFI
> trips.  This has happened every time.  It did not happen with the 15RES or
> the smaller back-up gen (which was disconnected manually).  With the 15RES
> the same GFI would occasionally trip while the unit was charging and
> handling house load, but never at the auto shutdown point.  I replaced the
> GFI, but it still trips.  There are three GFIs in the house, but only
> one--always the same--trips.
>
>
> *I suggested he adjust the AC2/Gen transfer delay to a lower number.  He
> reduced it to minimum and this did not resolve the problem.  I also had him
> verify that the AC source is selected as generator, which it is.
>
> Do you have any suggestions?
>
> Thanks in advance,
>
> William Miller
>
>
>  *Please note new e-mail address and domain:
>
> *William Miller
> Miller Solar
> Voice :805-438-5600
> email: william at millersolar.com
> http://millersolar.com
> License No. C-10-773985
>
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