Battery Strings in Balance [RE-wrenches]

[Mick Abraham]

The following was vetted with Michael Welch, Moderator before Posting:
  
The discussion about Battery Strings is interesting. The various 
comments indicate a common wish to avoid unbalanced state of charge 
within a series/parallel battery pack or even within a series only 
battery string. 

For 12 L-16 s in a 24 volt pattern, I cross-tie the pack but I also add 
the active battery equalizer from Smart Spark Energy Systems called 
BattEQ. This setup maintains all the L-16 s in the pack at equal 
voltage. The internal resistance of each L-16 would tend to be very 
consistent with the others as a result of the balancing effect (assuming 
that you begin with batteries that are consistently healthy and 
unsulfated). 

The issue about where to then land the main cables and/or the issue 
about buss-bars or no buss-bars are still worthwhile questions to 
consider, but are no longer driven by fear of unbalanced batteries.
  
I've seen mention on the List of the PowerCheq balancer from 
PowerDesigners, which balances 12 volt increments within a string but is 
current limited to only 2 amps (and therefore appropriate for small 
amp-hours only). I ve also seen mention on the List of using the 
SolarConverters products for a similar purpose.
  
Have any list members taken note of the Smart Spark developments? I 
would be interested in opinions & remarks from List members. Disclosure: 
I do not own any stock in Smart Spark, but I am a wholesale/retail 
distributor for BattEQ.
  

Abraham Solar Equipment
Pagosa Springs, CO
www.abrahamsolar.com


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