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Recurring charging problem: Charging aborted and 12V battery low (Norway)

Discussion in 'Model S: Battery & Charging' started by Aurvandil, Dec 1, 2013.

  1. Aurvandil

    Aurvandil P85

    Joined:
    Oct 11, 2010
    Messages:
    15
    Location:
    Oslo, Norway
    I have a recurring charging problem. I normally plug in the car every night. Often, perhaps a few times per week, charging is aborted during the night and I find red LEDs when I unplug the cable in the morning. The car reports "12V battery low" and predicts various dire consequences. Sometimes, the 12V is really low, and the displays do not work. Items like the remote and the door handles still work in this condition. Pressing the brake pedal to turn the car on and getting back out of the car to turn it off again clears the alarms and starts trickle charging the 12V battery. A few minutes later, everything works normally.

    I've called Tesla Roadside Service a couple times when the car has been in this condition. They tell me that the logs show that the car "lost connection to ground" during the night and has aborted charging for that reason. Trickle charging to the 12V battery is also interrupted as a safety measure due to the first error message. TRS do not have any good solutions to the issue, just a suggestion to try turning the connector plug upside down in the wall socket. The problem comes back, no matter which way the plug is inserted. The problem does not seem related to a particular wall socket. This happens both at work and at home.

    I'm located in Norway, where our electrical grid is slightly weird. It is a 230 V AC grid, but both phases are live at 130 V to ground. The 230 V between phases is due to a constant 120 degrees phase difference between the two conductors. There is no neutral conductor, just two live conductors and a protective earth. The voltages between the phases and ground can vary over time, depending on what else is connected to the grid. The display in the car reports anything from 228 to 239 V line voltage from day to day. I have not been able to pinpoint exactly what conditions trigger the error condition, but it seems to have become more frequent in the last few weeks.

    Does anyone else have this problem? Any advice on how to get rid if it? Any chance of damaging the 12V battery permanently? I suspect that discharging it completely several times per week in freezing temperatures does not really improve its health, if it is similar to other lead/acid batteries. I go away on business trips for several days or weeks at a time, and it is not clear if I am better off plugging the car in or leaving it unplugged. What happens if it panics on the first night and then slowly drains the batteries for two weeks in sub-zero temperatures?
     
  2. Lloyd

    Lloyd Active Member

    Joined:
    Jan 12, 2011
    Messages:
    4,885
    Location:
    San Luis Obispo, CA
    Since it is happening in more than one location, Try first getting a new charge cable from the service center and try charging again. You may just have a poor ground connection at the adapter for your UMC. Check to make sure that the reciptles are not worn or try charging at a third location. If neither of those are successful, then let the service center diagnose and repair.
     
  3. Mario Kadastik

    Mario Kadastik Active Member

    Joined:
    Sep 5, 2013
    Messages:
    2,041
    Location:
    Rae, Harjumaa, Estonia
    Get three phase 3x16A red socket installed. The power is the same as rest of EU as I've understood and at least you'll know if the weird grid is the source of your issues. That of course depends on actually having the red connector on UMC available as well as having three phase power at home in general, but the electrician costs shouldn't be high.
     
  4. Aurvandil

    Aurvandil P85

    Joined:
    Oct 11, 2010
    Messages:
    15
    Location:
    Oslo, Norway
    Thanks for the advice!

    Talking to Tesla Service twice today, it seems that the software in the car flags fairly normal conditions on the power grid as error conditions and panics. It will eventually be solved in some future software version.

    In the meantime, I have ordered a 3x16A 400 V transformer. Hope that fixes it, because the flurry of error messages almost every time I enter the car is driving me nuts. Then I only need the red adapter for 400 V three-phase. It should be available some time later this year or early next...
     

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