This is commonly said but as long as the batteries are of the same type and voltages you can safely parrallel bateries of differing age and even differing capacity. this is analagous to different sized water tanks linked together by pipes . They will all settle to the same level.
differing characteristics ARE relevant when batteries are in series .
The main hazard in parrallel operation is the possibility that
one of the batteries will break down and short out the others . this is not a common occurance and can be gaurded against by a fuse in each parrallel branch.
--- In electricboats@yahoogroups.com, Andrew Gilchrist <andrew@...> wrote:
>
> Chris
>
> There are some issues with using multiple batteries in parallel.
> Differences arise over time ( due to slight mismatches in internal
> resistance. Replacing damaged batteries with new and Internal resistance
> differences can create further issues.
>
> The optimum is a single battery where charge and discharge affect all
> components equally.
>
> However redundancy may be more usefull to you. In that case keep the
> paralleled batteries to as low a number as practical
>
> Andrew
>
> On 3/13/2012 8:02 AM, chris kelly wrote:
> > Thanks Eric.
> > I guess five batteries would require five times the maintenance and
> > maybe one failed battery is only a one fifth a loss in capacity.
> > good point about choosing batteries that fit the charge regulation system.
> > Thanks
> >
> > ----------------------------------------------------------
> > www.christopherkellyfurniture.com
> >
> >
>
>
> --
> AJ Gilchrist
> Fastelectrics
> 0419 429 201
>
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