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3 awg vs 6 wag length 100 feet and over

Discussion in 'Model S: Battery & Charging' started by RAM1950, Sep 12, 2015.

  1. RAM1950

    RAM1950 New Member

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    I'm expecting delivery of my preowned P85 in 2 weeks. Should I spend the extra$ and upgrade my home charger wiring to 3awg from 6awg. The length of wire required will be near or slightly over 100 ft. I will charging at 40 amps Nema 14-50 connector.
     
  2. kennybobby

    kennybobby Member

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    #2 kennybobby, Sep 12, 2015
    Last edited: Sep 12, 2015
    Not if the 6awg is copper wire, but if aluminum then yes. At 40A with copper you only drop 3 volts for that run, with 3awg copper you drop 1.5 volts.
     
  3. RAM1950

    RAM1950 New Member

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    Did you mean at 40A with aluminum you drop 3 volts?
     
  4. kennybobby

    kennybobby Member

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    #4 kennybobby, Sep 12, 2015
    Last edited: Sep 12, 2015
    No with aluminum it would drop 6 volts, but 40A is right at the limit for 6 AWG aluminum, 3 wires in a cable, UF TW wire, etc. FlasherZ is the expert on NEC, i'm just doing voltage drop calculations...
     
  5. RAM1950

    RAM1950 New Member

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    Thanks for your guidance
     
  6. Khatsalano

    Khatsalano Member

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    My dog likes 6 wag.
     
  7. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    And in my engineering world a WAG is a Wild A** Guess...
     

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