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  • garW8
    Junior Member
    • Sep 2014
    • 4

    #61
    140902-1220 EDT

    bcroe:

    I don't want to setup to measure voltage at 60 Hz, but a quick ohmmeter measurement puts the DC resistance below 0.1 ohm.

    If it was 0.1 ohm, then at 20 A the DC drop would be 2 V, and power dissipation would be 40 W. From a calculation of 40 W, that alone says the resistance is much lower than 0.1 ohm. AC impedance won't be much higher than DC resistance.

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    • bcroe
      Solar Fanatic
      • Jan 2012
      • 5198

      #62
      Originally posted by garW8
      140902-1220 EDT bcroe: I don't want to setup to measure voltage
      at 60 Hz, but a quick ohmmeter measurement puts the DC resistance below 0.1 ohm.

      If it was 0.1 ohm, then at 20 A the DC drop would be 2 V, and power dissipation would be
      40 W. From a calculation of 40 W, that alone says the resistance is much lower than 0.1 ohm.
      AC impedance won't be much higher than DC resistance. .
      OK thanks, conducts breaker current. You need a kelvin connection to measure that low, like I
      used on my 4 gauge loop. Send 1A through it, use a mili volt meter to get voltage drop.
      Ohms law gives the impedance. Bruce Roe

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