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Car refuses 72A charge?

Discussion in 'Model S: Battery & Charging' started by Jlindo, Jun 25, 2018.

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  1. Jlindo

    Jlindo Member

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    Hello!

    Just brought home our new X 100D and loving it. Had the HPWC installed on a 90A circuit tapped off our 200A main panel feed.

    The car starts charging at 72A just fine, but after approx 5 minutes, the charging stops with no error message in the car. It's necessary to unplug and plug in the charger again. And again after a few minutes at 72A it stops.

    Setting the max charge rate to 60A seems to work fine and the car can be charged without interruption.

    What might be going on?
     
  2. P85_DA

    P85_DA Supporting Member

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    What wire size u have ?
     
  3. Jlindo

    Jlindo Member

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    From the main panel? I'm not certain as the electrician installed it. He seemed to know exactly what he was doing fwiw. Understood the amperage requirements. But you never know I guess?
     
  4. tpham07

    tpham07 Active Member

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    When the car reduces charge amperage that means there is a problem with the power source usually. Try a destination charger and see if you have the same problem.

    During hot summer months here when everyone in the state has their A/C running max my voltage drops as low as 223V and to 44A from 48A.
     
  5. rhumbliner

    rhumbliner Member

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    Watch the voltage. It’s probably dropping to the point where the HPWC is reducing the draw to bring the voltage back up to an acceptable level. This is usually indicative of a wiring problem.
     
    • Helpful x 1
  6. scaesare

    scaesare Well-Known Member

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    The stopping, as opposed to reducing amperage, as well as no error message seems odd.

    Can you sit in the car and see if it gradually reduces the amperage before it ultimately stops, as well as see what the percentage of voltage drop when the car ramps up to 72A is?
     
  7. SSedan

    SSedan Member

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    Greenville Wisconsin
    Doesn't the new HCWC have a temp sensor in the handle?
    How warm is that getting?
    Also can you leave it and see if it begins again?
     

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