SW firmware upgrade flourescent flicker [RE-wrenches]

[Christopher Freitas --- OutBack Power]

Thought I would share what little knowledge I have on the Xantrex GTI 
and this issue...  

My undestanding is that this occurs when the GTI software is used 
without a GTI connected.  Internally the GTI includes a pass-thru relay 
which connects the AC loads directly to the grid when AC power is 
available.  If the GTI is not used or is connected incorrectly (or is 
not operating) than the loads are still being powered from the inverter 
which is pulsing its output as you describe as part of its islanding 
protection scheme.  

So does the customer have a GTI box on the system?

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com  
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030  


William Korthof wrote:
> 
> I'm here but I haven't paid close attention to the software
> versions. The Brand X inverters definitely don't generate
> great interest, and I always kind of expect to oversights
> and "gee wiz" features. The inverters were originally put
> in around mid 2001 and just got the upgrades.
> 
> /wk
> 
> At 01:17 PM 2/20/04 -0800, Jerry Caldwell wrote:
> >Are any of the Xantrex guys still on list?  Do you
> >guys have any input regarding this issue?
> >
> >Jerry Caldwell
> >Light Energy Systems
> >510-205-2798
> >
> >--- William Korthof <wkorthof at earthlink.net> wrote:
> > > Yes, I've seen the same result. "upgrade" is
> > > definitely a misnomer.
> > >
> > > /wk
> > >
> > > At 05:45 PM 2/19/04 -0800, Jerry Caldwell wrote:
> > > >Wrenches,
> > > >
> > > >I have a customer who had his pre-GTI Trace SW
> > > >inverters retrofitted with the new anti-islanding
> > > >software.  He claims that ever since the upgrade
> > > his
> > > >flourescent lights powered by the backed up loads
> > > >panel have a flicker that pulses about once every
> > > >second.  Sometimes the flicker is worse than other
> > > >times.
> > > >
> > > >Since the anti-islanding software is supposed to
> > > >disconnect and reconnect to the grid once per
> > > second,
> > > >I can't help but wonder if my customer isn't
> > > justified
> > > >by blaming the software upgrade.
> > > >
> > > >Has anyone had or heard of similar experiences?
> > > And
> > > >better yet, does anyone have ideas to solve this
> > > >problem?  I want to keep this customer relationship
> > > in
> > > >good standing.
> > > >
> > > >Jerry Caldwell
> > > >Light Energy Systems
> > > >510-205-2798
> >
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