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I need help with designing a 8 channel battery voltage / current datalogger

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    I need help with designing a 8 channel battery voltage / current datalogger

    I could buy a eight channel battery tester however all grounds are shared

    What I am wanting to do is charger and monitor the voltage / current of at least 4 batteries at a time in series and use a computer for the data-logging

    Does anyone on the forum have any ideas how I could do this
    9 PC LCD Monitor
    6 LCD Flat Screen TV
    30 Desk Top Switching Power Supply
    10 Battery Charger Switching Power Supply for Power Tool
    6 18v Lithium Battery Power Boards for Tool Battery Packs
    1 XBox 360 Switching Power Supply and M Board
    25 Servo Drives 220/460 3 Phase
    6 De-soldering Station Switching Power Supply 1 Power Supply
    1 Dell Mother Board
    15 Computer Power Supply
    1 HP Printer Supply & Control Board * lighting finished it *


    These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

    1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
    2 Hem Saw Computer Stack Board

    All of these had CAPs POOF
    All of the mosfet that are taken out by bad caps

    #2
    Re: I need help with designing a 8 channel battery voltage / current datalogger

    voltage is easy, get a microcontroller with enough analog chanels and just tap all the midpoints.
    then use math to seperate the readings.
    so the first cell is direct,
    the second cell you deduct the voltage at the first cell.
    the third cell you deduct the voltage at the second.
    and so-on.

    not sure how you read current without a common rail.

    Comment


      #3
      Re: I need help with designing a 8 channel battery voltage / current datalogger

      I want to do this with isolated voltage reading if possible
      9 PC LCD Monitor
      6 LCD Flat Screen TV
      30 Desk Top Switching Power Supply
      10 Battery Charger Switching Power Supply for Power Tool
      6 18v Lithium Battery Power Boards for Tool Battery Packs
      1 XBox 360 Switching Power Supply and M Board
      25 Servo Drives 220/460 3 Phase
      6 De-soldering Station Switching Power Supply 1 Power Supply
      1 Dell Mother Board
      15 Computer Power Supply
      1 HP Printer Supply & Control Board * lighting finished it *


      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
      2 Hem Saw Computer Stack Board

      All of these had CAPs POOF
      All of the mosfet that are taken out by bad caps

      Comment


        #4
        Re: I need help with designing a 8 channel battery voltage / current datalogger

        why?

        Comment


          #5
          Re: I need help with designing a 8 channel battery voltage / current datalogger

          Originally posted by stj View Post
          why?
          Because I want to test BMS balancing protection boards
          Because I want to match battery for the BMS balancing protection board

          Because just how accurate is use a voltage divider are you really measuring the actual voltage is or a rough estimate of voltage
          9 PC LCD Monitor
          6 LCD Flat Screen TV
          30 Desk Top Switching Power Supply
          10 Battery Charger Switching Power Supply for Power Tool
          6 18v Lithium Battery Power Boards for Tool Battery Packs
          1 XBox 360 Switching Power Supply and M Board
          25 Servo Drives 220/460 3 Phase
          6 De-soldering Station Switching Power Supply 1 Power Supply
          1 Dell Mother Board
          15 Computer Power Supply
          1 HP Printer Supply & Control Board * lighting finished it *


          These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

          1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
          2 Hem Saw Computer Stack Board

          All of these had CAPs POOF
          All of the mosfet that are taken out by bad caps

          Comment


            #6
            Re: I need help with designing a 8 channel battery voltage / current datalogger

            I still have not found a solution to issue but still looking for one

            Is there a way to monitor the voltage using an optic sensor as isolating barer I am just asking the question if could be done this and if it can how would you do this
            9 PC LCD Monitor
            6 LCD Flat Screen TV
            30 Desk Top Switching Power Supply
            10 Battery Charger Switching Power Supply for Power Tool
            6 18v Lithium Battery Power Boards for Tool Battery Packs
            1 XBox 360 Switching Power Supply and M Board
            25 Servo Drives 220/460 3 Phase
            6 De-soldering Station Switching Power Supply 1 Power Supply
            1 Dell Mother Board
            15 Computer Power Supply
            1 HP Printer Supply & Control Board * lighting finished it *


            These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

            1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
            2 Hem Saw Computer Stack Board

            All of these had CAPs POOF
            All of the mosfet that are taken out by bad caps

            Comment


              #7
              Re: I need help with designing a 8 channel battery voltage / current datalogger

              I just thought of a possible solution but you won't like implementing it if you're not an EE as it has so many pitfalls... (Basically put a multimeter at every battery and read each one on its own) so I think you have to go with stj's method or electromechanical....

              Comment

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