SW re-discovers lightning [RE-wrenches]

[Darryl Thayer]

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Hi folks
I think the batteries were toast before the outage,
the outage only allowed them to die at a critical
time.  See the many posts here about short lived grid
tie battery systems.  The SW systems really like to
overcharge when many short outages occur. 

Thanks
Daryl

--- Kurt Nelson <sunwise at cheqnet.net> wrote:
> Greetings all again,
> 
> I posted a month or so back about agrid-tied
> w/battery SW system that
> worked fine for almost five years, perhaps took a
> hit in a lightning
> storm (owner came home after a weekend away/storm to
> find the whole
> system "just shut down" and no power to the home.
> 
> After she got things fired back up, her inverter
> suddenly seemed
> vulnerable to even minor storms and showers.
> 
> The home is grid-tied so they were just without
> back-up for the last
> couple weeks and I finally got over that way today. 
> While I couldn't
> find anything wrong with the inverter, the battery
> was total toast.  The
> heliotrope CC had the battery held at 28, and if I
> put it in EQ the
> battery would go to 38 VDC in a second or so and
> then drop to 18V in a
> few more seconds without PV or SW support.
> 
> I'm hoping what we have here is:
> 
> 1)  Bad battery went south, most noticeably after a
> weekend of vacancy
> complete with a power outage to the home.
> 
> 2)  After that, and with a rainy and stormy spring
> in the upper Midwest,
> the home owner felt that failures of the system were
> related to the fact
> that it was always raining/storming, even though the
> storm was a long
> ways away.
> 
> 3)  I guess the question is would a lack of
> battery/too small a
> battery/mostly really dead battery result in SW
> shut-downs, even if
> there were no other utility outages and the batts
> were floating in a
> inverter and PWM solar heaven??  
> 
> Then again, could it be that the tiny dead battery
> isn't offering the
> usual (healthy battery) buffering of lightning
> induced voltage surges to
> the DC side of the inverter from the PV/DC wiring?
> 
> This may be an early post/update, as we'll see how
> things perform with a
> healthy battery once again.
> 
> Kurt Nelson
> 
> 
> Thanks as per usual -- Kurt Nelson
> SOLutions 
> 



		
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