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is there any calculator or simulator for battery DIY?

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    is there any calculator or simulator for battery DIY?

    i keep thinking of making 72V 45A battery
    out of 3.7V 30A cells

    but if i 19 serial it would be 70.3V
    or 20 serial it would be 74V unlike 3.6V cell
    so if i overvolt or undervolt like that the BMS will balance it to 72V?

    what about amp
    the constant current
    the battery spec is 30A
    so if i 2 parallel will it be 60A?
    i need 45A but 60A is dangerous?
    how do i make it 45A
    should i use lower spec cells?
    any way to do it without lower spec cells?

    i hope theres layout template by volt and amp or simulator thing to be sure not to blow up anything

    #2
    its 19 x 4.2v at the high end. Which is 79.8. Make sure your controller can handle the high end charge. Amps would depend on your specific cell.

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      #3
      the spec of cell is 30A

      Comment


      • D.808
        D.808 commented
        Editing a comment
        30 amps does not sound right from a single cell.

      #4
      Originally posted by hardgore View Post

      what about amp
      the constant current
      the battery spec is 30A
      so if i 2 parallel will it be 60A?
      i need 45A but 60A is dangerous?
      how do i make it 45A
      should i use lower spec cells?
      any way to do it without lower spec cells?

      i hope theres layout template by volt and amp or simulator thing to be sure not to blow up anything
      If I understand you correctly, you are saying you are building a pack that is a 2p configuration using cells that can each handle discharge of 30amps (what cells are they??)?

      So:
      1. Yes, the pack is theoretically capable of 60amp discharge.
      2. If your controller can draw 45amps max, that is all that will be demanded of the battery
      3. This is no problem, is not dangerous, and in fact it is better that the cells are not taxed to their maximum rated discharge capability
      4. You don't mention the BMS, but one should be used that can also allow at least 45amps discharge.

      Comment


        #5
        why someone thinks 30amp is not right from a single cell.
        the cell is twice bigger than what you re thinking

        Comment


          #6
          Im thinking 18650. But yes, some batteries are 30A. Just no 18650 that I know of.

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