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Can I set the charger to pull more than 40a from a NEMA 14-50?

Discussion in 'Model S: Battery & Charging' started by elecblue, Dec 22, 2012.

  1. elecblue

    elecblue Member

    Aug 16, 2012
    Singapore (for next 2 years) previously Chicago, I
    I have a NEMA 14-50 at home, and would like to pull more than 40 amps - to see if I can get it higher (really just a test). However, the car won't let me go over 40a. Does anyone know how to adjust this?
  2. CanuckS#69

    CanuckS#69 Member

    Oct 20, 2012
    Sutton West, ON
    My understanding is that 40a is the limit for continuous draw on a 50a circuit. Above 40a is ok for burst, but not long term.
  3. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

    Jun 21, 2012
    You can't. The UMC sends a pilot signal based on the adapter attached, and since the UMC is rated for only 40A maximum current, that's all that will be allowed. There might be a way to force it in the car but we're not privy to that.
  4. markb1

    markb1 Active Member

    Feb 17, 2012
    San Diego, CA
    I think that's correct. If you want to charge faster, you have to charge off a HPWC, supercharger or high-amp J-1772, which all come with their own cables and connectors that are designed for the current they supply. If you try to trick the car into pulling more than 40A over the UMC, you risk destroying the UMC and charge port, and starting a fire.

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