tope 20% of SLA battery charging efficiency

Discussion in 'General Electronics Chat' started by bug13, Feb 4, 2013.

  1. bug13

    Thread Starter Senior Member

    Feb 13, 2012
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    Hi guys

    Does anyone have some information about the charging efficiency of the top 20% of a SLA battery?

    I am working on a solar project, from the information I get, it's a good idea to work with the top 20% of the capacity of a SLA battery.

    And now I am working on how much energy do I need to top that 20% up.

    Thanks guys!

    edit:

    when I said top 20%, I mean from 80% of state of charge to near 100% state of charge.
     
    Last edited: Feb 4, 2013
  2. crutschow

    Expert

    Mar 14, 2008
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    The top 20% would be from 20% of the amp-hour battery rating.
     
  3. #12

    Expert

    Nov 30, 2010
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    Sir, I believe you have misinterpreted the question. The "rule of thumb" that I last heard was that it takes 150% input to recharge a lead acid battery. That might be wrong, but 10 amp hours in to replace 10 amp hours out seems impossible because it represents 100% efficiency. The fact that a battery gets warm when you charge it belies that.

    May I suggest http://batteryuniversity.com/

    and see if that site has a useful figure?
     
    Last edited: Feb 4, 2013
  4. bug13

    Thread Starter Senior Member

    Feb 13, 2012
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    Hi #12,

    I have been to the batteryuniversity.com, I don't find the information I need.
     
  5. #12

    Expert

    Nov 30, 2010
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    Last edited: Feb 5, 2013
  6. bug13

    Thread Starter Senior Member

    Feb 13, 2012
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    Hi #12,

    Thanks a lot, that's very helpful!!

     
  7. #12

    Expert

    Nov 30, 2010
    17,301
    8,149
    That's what the "Thanks" button is for.
     
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