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Question FLA battery use vs longevity

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(@Neal Smith)
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Joined: 7 months ago
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Mike, I have been looking at the cycles of discharge vs DOD, and have a question/comment.

I realize that DOD is only 1 factor in the total life of a battery.  If, for example, I did the "standard" DOD of 50% but only did that 50 times a year, I'm not going to get a battery life of 1150 / 50 or 23 years.  When looking at it from a standpoint of how many total amps a battery gave over it's life, with a 100AH battery, DOD of 10-20% gives a total in the range of 70,000 amps (20 x 3500 and 10 x 7000).  DOD in the 50 to 90% range runs in the 53,000 to 57,000 range going from 590 cycles to 1150 cycles.  

So, if I use a battery system, which I maintain with a multi-stage charge system, with a monthly de-sulfation mode, and water regularly with a flo-rite system, but only use approx. 50 cycles per year, in 10 years I've still used less charging cycles than the expected number if doing 90% DOD.  In that situation, does it make sense to use the deeper discharge?  If I could even make it to 10 years, that would be 50 x 50 x 10 = 25,000 total amps vs 90 x 50 x 10 = 45,000 total amps.

Does this make sense, or are there other factors that the deeper DOD would affect?


   
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(@Neal Smith)
New Member
Joined: 7 months ago
Posts: 3
 

This is an honest question, for which I am hoping to get an answer.  However, I haven't seen anything posted from Mike in a while.

Is he OK?

The chart I took this from was in an answer from Mike on this site, but came from a battery company.   I don't think I saw what their endpoint was, nor over what time period.  The main concern I have is whether deep discharge would shorten the battery life (time wise).  I Would really like to hear from an expert on this.  To ask the question differently,  if I was to do discharge to say 75% DOD, 20 times per year, would the batteries (with the good care mentioned in first post) still last 5+ years?


   
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(@Anonymous)
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With lead acid batteries, the secret to life time Amp-hrs is *promptly & fully* charging after every discharge and to make sure that you've returned the Amps-hrs consumed during the previous discharge & some more (10-20%) to account for the chemistry's less than 100% Coulombic efficiency. For example, if the last discharge consumed 50 Ah, the charging process must return 50 Ah plus 5 to 10 additional Ah. This is something most chargers are not capable of.


   
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