Fwd: RE: short lived UPS system [RE-wrenches]

[Darryl Thayer]

This did not post the first time I sent it.
Daryl
--- Darryl Thayer <daryl_solar at yahoo.com> wrote:
> Date: Thu, 25 Sep 2003 06:58:37 -0700 (PDT)
> From: Darryl Thayer <daryl_solar at yahoo.com>
> Subject: RE: short lived UPS system [RE-wrenches]
> To: RE-wrenches at topica.com, jfisher at nahbrc.org
> 
> Hello to all
> Since my last post on this topic, I have had two
> more
> calls on failed failed UPS systems,y2k 3years old. 
> one with L16 one with golf cart batteries. (both
> Lead
> Antinmony technology) All with Hydro caps.  The
> inverters were all SW5548s, Both said they had
> watered
> maybe 6 months to a year ago they did not remember.
> Both thought the water use was very low at first,
> and
> when the system failed the water-acid was almost
> gone.
> One system had functioned several times due to grid
> failure the other maybe twice in 3years.  
> 
> Is it the batteries having a high self discharge? or
> is perhaps one cell fails which causes the other
> cells
> to be overcharged.  On one system the hydrocaps had
> melted.   On the other system the hydrocaps looked
> fine.
> 
> I am installing C&D Orion series, 1000 ah two
> paralled
> sets on one system, and L-16s on the other system.
> The
> previous two systems that I mentioned I am
> installing,
> one is getting C&D Orion series one string, 530 AH
> and
> the other Surretts two parlleled.  
> 
> I do not like to parallel sealed or any battery, but
> economics of the 535 AH Orion being on sale pushed
> me
> over the hill.    
> Daryl
> 
> --- Jason Fisher <jfisher at nahbrc.org> wrote:
> > I've now had two Y2K customers (I know, but what
> was
> > I going to say, no?),
> > each with PV charging sixteen L16s @ 48V and SW's
> in
> > sell mode, have their
> > entire banks fail in the last year. These robust
> > battery banks were only
> > about 3 years old! It's hard for me to know what
> > happened since they claim
> > they watered the batteries and cannot give me a
> good
> > idea of whether the
> > system was cycled or equalized on any regular
> basis
> > (which probably means
> > none of these events occurred!). These
> > recommendations had been given to
> > them in their owner's manual.
> > I also have another customer, also with sixteen
> L16s
> > of the same vintage,
> > who has kept the water up, cycled the bank
> > frequently, and equalized every
> > few months. His bank is doing fine.
> > 
> > I stopped selling flooded batteries to grid-tied
> PV
> > customers who wanted
> > backup in 2000. I simply didn't believe them when
> > they said they "enjoy"
> > watering the batteries and interacting with their
> PV
> > system. Now that I've
> > experienced these premature failures, I'm sure
> this
> > was the right idea.
> > 
> > On this note, any common failure modes of gells or
> > AGMs anyone knows about?
> > 
> > Jason Fisher
> 
> 
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