alt.energy.homepower

On 18 Feb 2008 07:27:46 -0500, nicksanspam@ wrote:

> wrote:
>
>>The problem, particularly in series parallel strings, is if one goes
>>bad, replacing it can jeopordize the rest. They NEED to be well
>>balanced to work well and live long.
>
>How well-balanced? How can we measure that?
>Series resistance? Self-discharge rate?
>Numbers, numbers, numbers...
>
>Nick
That's the rub. 4 batteries from the same batch, particularly with
sequential serial numbers are a pretty good bet. 3 batteries a year
old and one brand new one are a poor bet. Generally the rule of thumb
is all batteries in the parallel pack should be replaced together.
One way to salvage that extra battery is to by 3 instead of 2 if it is
only "2 wide" and add to your capacity by going "3 wide" putting the 3
"matched" batteries together.

I suppose testing with a trans-conductance tester would give you SOME
numbers to compare. (capacity)

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