Hello William,
As a follow up to a similar problem:
I recently traced the problem to the generator. With the OB power
system disconnected from the Kohler 8.5 RES and a halogen lamp
connected to the generator, voltage surges at shutdown from one phase
to neutral ranged from 135 to 168VAC. With the OB system connected
the surge was 178VAC at shutdown. No tweaking in the mate allowed
the inverter to drop input before the surge. A cool down time
eliminates the surge with an AGS gen stop. To eliminate the surge
with a manual shutdown from the mate a contactor controlled by the
AGS signal was installed to interrupt the generator input.
Thirsty Lake Solar
Jeff Wongstrom
NABCEP Certified Solar Installer
University of Montana College of Technology
Renewable Energy Instructor
406-219-1119
thirstylakesolar
energytechnology
On Jun 14, 2010, at 11:31 PM, William Miller 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: will...@millersolar.com
http://millersolar.com
License No. C-10-773985
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