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High Amperage Charger Really is ONLY 17.2kW - Current Lowers at High Voltage

Discussion in 'Model X: Battery & Charging' started by araxara, Apr 22, 2016.

  1. araxara

    araxara S-P85#3,218 X-90D#3,299

    Joined:
    May 11, 2012
    Messages:
    847
    Location:
    Tucson, AZ
    I was hoping that the 17.2kW High Amperage Charger would give me a little more power if the voltage was above 240V (72A*245V), but it appears that the car lowers the current for voltages above 240V. See the following (very short) video where the voltage is lowered to 68A:

    [​IMG]
    Low Amps Video
    by araxara, on Flickr

    My voltage is higher than 240V due to solar panel output. Also, the charge current is normally 72A. I have not lowered it myself.
     
    • Informative x 1
  2. FlasherZ

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

    Joined:
    Jun 21, 2012
    Messages:
    7,030
    Yes, I've posted about this earlier.

    I confirmed it with Tesla. The charger is firmware-limited to 17.5 kW maximum and at voltage above 240, will scale back current. This is done to guarantee the longevity of the charger. I understand from some of my contacts that there is a possibility this could change in the future once there is more data, but there is no commitment.
     
    • Informative x 4
  3. Colby Boles

    Colby Boles Member

    Joined:
    Dec 29, 2015
    Messages:
    307
    Location:
    San Francisco, CA
    Unfortunately, it seems to be both power and current limited. I have the charger on a 208Y service and can only hit 72A. I was secretly hoping it would go to 84A at this voltage.

     
  4. FlasherZ

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

    Joined:
    Jun 21, 2012
    Messages:
    7,030
    This is true of all Tesla's chargers. Current is what determines the trace and wire sizing for the chargers.
     

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