Re: Easy Service Call - Impressive Batteries

[Jim Rojas <jrojas@xxxxxxxxxxxx>]

On 8/9/2015 9:18 AM, ABLE1 wrote:
> On 8/9/2015 2:08 AM, Jim Rojas wrote:
>> When connecting  battery banks in parallel, the key is to cross connect
>> the charging leads. At the first bank I connect only the positive lead,
>> and at the last bank I connect the negative lead. If you fail to follow
>> this important step, all the batteries in between will all die
>> prematurely. This is especially true with just about any battery. A
>> cross connection forces the charge to travel throughout all the battery
>> banks evenly. The batteries then balance themselves out without the need
>> of any additional balancing circuits that are commonly used on 18650
>> batteries.
>
>
> Sorry Jim,  I am really not getting that.  Maybe it is my old brain but
> are you not connecting the positive leads from each battery bank
> together as well as the negative leads??  And then you end up with 1
> positive and 1 negative that will connect to the panel battery leads??
>
> I can't see where one bank would be first or last or in between.
>
> The banks in parallel the voltage will remain the same but the amps
> would double with two banks, triple with three banks etc. etc.
>
> Am I missing something??
>
> Les
>

You don't want to connect battery banks together with a wire nut and
hope for the best. You need to use a bus bar or terminal strip. You must
force the charging voltage to flow evenly. It will only take the path of
least resistance by connecting them together with wire nuts.

+ <--B1----B2----B3----B4

      B1----B2----B3----B4--> -

---- is a bus bar or terminal strip

If you connect the negative to B1, you will cause B2-B4 to die
prematurely. The current flow is only going through B1.

Honeywell panels that use the dual battery harness is a perfect example
on how not to connect batteries. Eventually, one battery will die before
the other.

Jim Rojas

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