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Thread: Measuring resistance

  1. #1
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    Default 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

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

  3. #3
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    Quote Originally Posted by Prodrvr View Post
    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

  4. #4
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    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

  5. #5
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    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?

  6. #6
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    Quote Originally Posted by TRUCKPULL View Post
    What solder are you using?

    Larry
    40 tin 60 lead w flux

  7. #7
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    Quote Originally Posted by Prodrvr View Post
    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

  8. #8
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    Default 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

  9. #9
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    Quote Originally Posted by StevenBryant View Post
    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..

  10. #10
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    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

  11. #11
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    Quote Originally Posted by TRUCKPULL View Post
    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

  12. #12
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    What resistor are you using?

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