Fw: off grid battery equalization [RE-wrenches]
Hugh Piggott
hugh at scoraigwind.co.uk
Sat Sep 25 23:31:10 PDT 2004
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Not a very satisfactory reply, in that he does not explain how one
cell in one string could be holding back the whole bank. Unless it
is losing charge (shorting) in which case I would expect to see
prolonged high charging current. When people say that the battery
does not reach full charge on an amphour meter they also have to say
what criteria are programmed into the meter. It's just a machine (I
think).
> > Regarding the gentleman from Peltz Power's comments: not sure how our
>> electrolyte solution varies from any other lead-acid battery
>> manufacturer (Sulfuric Acid), other than our concentration / strength is
>> often lower (1.265 vs. 1.280-1.300) which promotes longer battery life.
Here in the UK we can sometimes get secondhand storage cells which
are huge and have a lifetime of 25-40 years. The acid is much less
strong but there is more electrolyte in each cell. The cell voltages
(off load full charge) are always lower than other battery types and
I believe this is a chemical phenomenon due to the low gravity. I
love these batteries but they are too expensive to buy new and are
getting hard to find used.
I have a friend who installs diesel sets and I helped him get up to
speed on installing inverters. He now tells me that he has installed
some Outback FX inverters and they charge batteries "much better"
than the SW. He can't say how they do this. I would have thought
that you just had to set the voltage parameters etc and you could
charge any battery with an SW. Battery charging seems to involve
some element of voodoo beyond the numbers. Does anyone agree with
him that the FX charges batteries better, and if so what exactly do
they mean by this? I was surprised he liked the FX so much because
the generator control features are relatively crude but he says most
of the systems he works on the generators are run on timers.
--
Hugh
Scoraig Wind Electric
http://www.scoraigwind.co.uk/
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