Measuring resistance

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  • Crash
    Senior Member
    • Oct 2015
    • 313

    #1

    Measuring resistance

    is there a way to measure the resistance in the connections between your wires in your lipos in your motor and your ESC Etc
    I'm getting Heat at my connections over a hundred and fifty degrees Fahrenheit
  • Prodrvr
    Senior Member
    • Jul 2015
    • 701

    #2
    The wire resistance between the battery and esc is insignificant. What connectors are you using for battery to esc connection? Esc to motor?

    Comment

    • Crash
      Senior Member
      • Oct 2015
      • 313

      #3
      Originally posted by Prodrvr
      The wire resistance between the battery and esc is insignificant. What connectors are you using for battery to esc connection? Esc to motor?
      6.5 mm

      Comment

      • TRUCKPULL
        Fast Electric Addict!
        • Apr 2007
        • 2971

        #4
        What solder are you using?

        Larry
        Past NAMBA- P Mono -1 Mile Race Record holder
        Past NAMBA- P Sport -1 Mile Race Record holder
        Bump & Grind Racing Props -We Like Em Smooth & Wet

        Comment

        • Prodrvr
          Senior Member
          • Jul 2015
          • 701

          #5
          I use 6mm from esc to motor, 7mm from batt to esc, all soldered with lead free 4% silver solder. Haven't had any heat issues on the connectors. How's the temps on the esc, motor, battery?

          Comment

          • Crash
            Senior Member
            • Oct 2015
            • 313

            #6
            Originally posted by TRUCKPULL
            What solder are you using?

            Larry
            40 tin 60 lead w flux

            Comment

            • Crash
              Senior Member
              • Oct 2015
              • 313

              #7
              Originally posted by Prodrvr
              I use 6mm from esc to motor, 7mm from batt to esc, all soldered with lead free 4% silver solder. Haven't had any heat issues on the connectors. How's the temps on the esc, motor, battery?
              the motor, batteries, ESC are not hot. 120 to 135F

              Comment

              • StevenBryant
                Senior Member
                • Nov 2012
                • 359

                #8
                Measuring resistance

                Crash you are running connectors rated at 200 amps in a setup pulling 250amps. Use 8mm castle connectors rated at 300amps or Lehner 6mm connectors rated at 400amps.

                An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. ... As the temperature increases, the metal ions vibrate more. There are more collisions with the electrons and so the resistance increases


                Resistance has a direct relationship to the temperature of the connectors, at ambient temperature the connectors will show a lower resistance than when the connectors start to heat up.


                Sent from my iPhone using Tapatalk

                Comment

                • Crash
                  Senior Member
                  • Oct 2015
                  • 313

                  #9
                  Originally posted by StevenBryant
                  Crash you are running connectors rated at 200 amps in a setup pulling 250amps. Use 8mm castle connectors rated at 300amps or Lehner 6mm connectors rated at 400amps.

                  An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. ... As the temperature increases, the metal ions vibrate more. There are more collisions with the electrons and so the resistance increases


                  Resistance has a direct relationship to the temperature of the connectors, at ambient temperature the connectors will show a lower resistance than when the connectors start to heat up.


                  Sent from my iPhone using Tapatalk
                  I took the 6200 watt motor out, it was pulling 255 amps.
                  I put a 4200 watt motor in and ran it for a test lap at pond and checked temps and the damn wires are the hot spot again. if its not poor soldering job it must be the connectors..

                  Comment

                  • TRUCKPULL
                    Fast Electric Addict!
                    • Apr 2007
                    • 2971

                    #10
                    60/40 is not the best for electronics.

                    This is the stuff that Castle uses

                    Kester -SN96.5AG03CU.5 2.2%

                    Larry
                    Past NAMBA- P Mono -1 Mile Race Record holder
                    Past NAMBA- P Sport -1 Mile Race Record holder
                    Bump & Grind Racing Props -We Like Em Smooth & Wet

                    Comment

                    • ray schrauwen
                      Fast Electric Addict!
                      • Apr 2007
                      • 9471

                      #11
                      Originally posted by TRUCKPULL
                      60/40 is not the best for electronics.

                      This is the stuff that Castle uses

                      Kester -SN96.5AG03CU.5 2.2%

                      Larry
                      That stuff is the shiznits! Thanks for the solder Larry!
                      Nortavlag Bulc

                      Comment

                      • goodone963
                        Junior Member
                        • Mar 2019
                        • 1

                        #12
                        What resistor are you using?

                        Comment

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