[chbot] Big batteries

[Helmut Walle]

Depending on your application, telecom backup batteries may not be 
what you want... you may already be aware of this, but there are quite 
different flavours of lead-acid batteries. They are all based on the 
same chemistry, but there are huge differences between the plate 
designs.

There are specific batteries for cars (lighting / starting / ignition 
= LSI), which are designed for high currents but don't like being 
cycled. Then there are traction / deep-cycle batteries that are 
designed for being cycled over their full capacity, but they don't 
tolerate quite as high currents as the LSI batteries (I don't know 
whether the ones used for storage in solar-electric applications are 
simply from this category, too, or whether they are again specific to 
their intended use). And then there are backup batteries like the ones 
used in telecom applications, and these are optimised for being 
floated fully charged for long periods of time, without being cycled 
much at all. This is just a very superficial overview, but the point 
is that if you are using a lead-acid battery for an application 
contrary to its design, it will not perform well, and it may shorten 
the battery's life significantly.

Kind regards,

Helmut.

-- 
+------------------------+
| Helmut Walle           |
| Helmut.Walle at gmail.com |
| +64-3-388 39 54        |
+------------------------+

On Tue, 18 Oct 2011, Robin Gilks wrote:

> I think it was Jasper I was talking to last night about large telecom
> style batteries (1200 amp-hrs plus). My hearing isn't as good as it used
> to be so I missed a few details - like where to get them from and how much
> to expect to pay for them!!
>
> Could someone put me straight on this info? I'm after 24 volts worth (12
> cells) with a usable capacity of over 900 amp-hrs.
>
> Cheers
>
> -- 
> Robin Gilks
> Internet: robin at gilks.org    http://www.gilks.org
> Tel:      (+64) (3) 347 4370
>
>
>
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