Uh, what about this:
http://www.battcon.
Monitoring the current of each of the two paralleled batteries will tell you
what's happening to each of them. Inasmuch as you're probably sitting on a
float charger, self-discharge may not be an issue at all. I would be
inclined to say the amp-hour capacity of the the paralleled pair is the sum
of the amp-hour capacities of each of the two, despite their being quite
different.
JoeS.
> From: Tad G <tad@planetisuzoo.
> Reply-To: <electricboats@
> Date: Thu, 16 Jul 2009 18:00:07 -0400 (EDT)
> To: <electricboats@
> Subject: Re: [Electric Boats] When good batteries go bad
>
> One of the reasons to not do that is that you end up with the good battery
> charging the bad one, the worse case scenario in terms of losses. As soon as
> the charger isn't keeping the bad one topped off the good one will start do to
> so, but obviously it won't be able to and they will both loose charge until
> they are depleted. That's one of the reasons for battery isolators. Two
> batteries that aren't exactly the same will self discharge faster when
> connected together than when disconnected.
>
> -Tad
>
>> ----- Original Message -----
>> From: "aweekdaysailor" <aweekdaysailor@
>> To: electricboats@
>> Sent: Thursday, July 16, 2009 12:47:52 PM GMT -05:00 US/Canada Eastern
>> Subject: [Electric Boats] When good batteries go bad
>>
> (snip)
>>
>> My theory is...if I pair a new battery with the worst of the pack (in
>> parallel) then that unit now acts like a medium-good battery in relation to
>> the others (the good battery will be trying to continually charge the bad one
>> during discharge - conversely during charge the good battery will be helping
>> the charger see it's "full" and go into float). I think I still won't get the
>> full pack amperage, but some "average" value determined by the weakest pair.
>>
>> There are lots of warnings about not doing this - but no clear explanations.
>>
>> Any battery gurus care to comment on the strategy?
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