[RE-wrenches] unique battery bank design question

[boB Gudgel]

On 9/3/2011 7:57 PM, Darryl Thayer wrote:
> I have had one experiance with equalizers, the batteries be came very 
> unequal.  (over time of course)
>
> *From:* R Ray Walters <ray at solarray.com>
> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
> *Sent:* Saturday, September 3, 2011 5:55 PM
> *Subject:* Re: [RE-wrenches] unique battery bank design question
>
> Systems I tried years ago with Vanner equalizers, still ended up being 
> unequal. I pulled them all years ago. It seems to be about as much a 
> problem as not balancing your battery cables so each battery string 
> has the same wire resistance,
> I know that you couldn't imagine a few amps on 12" of 2/0 making a 
> difference, but after 5 years the battery damage is very consistent 
> and identifiable.
> The only load I would consider tapping would be metering, or maybe a 
> low milliamp relay. I wouldn't go over 100 mA, and even then I bet you 
> would see some long term imbalance. I've seen imbalances due  to some 
> batteries just being closer to a cold outside wall.
>
> R. Walters
> ray at solarray.com <mailto:ray at solarray.com>
> Solar Engineer


Has anyone that has used battery balancers checked the individual 
battery voltages or SG during charge and/or discharge to
see how well the balancers worked ??

Could it be that the batteries themselves were just not quite the same 
age at the start ??

I would think that a decent balancer system that makes things share 
should work pretty well.  Maybe the balancer
itself does a bit of unbalaced charge/discharge ?

boB


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