4 Bat capacity

Discussion in 'General Electronics Chat' started by halah, Dec 25, 2013.

  1. halah

    Thread Starter New Member

    Dec 25, 2013
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    0
    Question:






    if we have 4 Bat capacity B1 60%,B2 70 % , B3 90 % B4 95% how we can calculate



    autonomy Time (back up time) for all Bats
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
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    How are they wired? Can you disconnect some batteries before the others?
     
    halah likes this.
  3. halah

    Thread Starter New Member

    Dec 25, 2013
    3
    0
    Question: We have 4 Battery 12 V 170AH. We need calculate autonomy time (back up time) when we connect four Batteries two sets (2 Batteries in series and two set in parallel to get 24V) with load drawn 50 Amp DC. How calculate total Capacity (Ah) for batteries. we have T=A/AH but need more equations related Battery time discharge.




    if we have 4 Bat capacity B1 60%,B2 70 % , B3 90 % B4 95% how we can calculate



    autonomy Time (back up time) for all Bats
     
  4. tubeguy

    Well-Known Member

    Nov 3, 2012
    1,157
    197
    Please clarify:

     
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  5. halah

    Thread Starter New Member

    Dec 25, 2013
    3
    0
    if we have 4 Bat capacity Bat-1 60% ,Bat -2 70 % , Bat-3 90 % , Bat-4 95% how we can calculate autonomy Time (back up time) for all Bats





    did total time take 60%
    or
    or collect (60+70+90+90)/4



    or how caculte total back up time?
     
  6. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    You have to stop discharging all the other batteries when the first battery is discharged to 11V, otherwise you will damage them, so the capacity of the entire bank is only as good as the battery with the lowest capacity. If you can disconnect the series branch of two batteries containing the worst battery, you can continue discharging the second branch a bit longer...
     
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