SoC loss when vehicle is parked for a few days

Discussion in 'Hyundai Kona Electric' started by FloridaSun, Dec 1, 2019.

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  1. FloridaSun

    FloridaSun Well-Known Member

    I went to Washington DC on Thursday and left my car at Orlando Airport. The SoC was 71% when I parked the car 3 days ago. I just checked and the SoC is still 71% and range is unchanged at 235 miles. That's pretty amazing. I wonder how many days it takes to lose 1% of charge..
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  3. Left the Kona parked for 16 days in a 50 degree garage, no change in available range or SoC.

    Also, I had the "Aux. Battery Saver+" deactivated as per the US owners manual page H57-58 so no charging of the 12V battery from the traction battery. 12V battery voltage when I left it was 12.4V, upon return, 12.1V.
  4. FloridaSun

    FloridaSun Well-Known Member

    Wow, that's amazing..
  5. That's a reason to leave the battery saver on. The 12V battery will drain faster than the high voltage battery and worst comes to worse you'll have an empty 12V. But if you loose 10% (which you won't) of the high voltage battery you'll still be able to pull up to a charger and charge.

    Assumptions made here:
    - you don't need a full HV battery immediately after you come back
    - you don't have a jump battery ready

    However I'd prefer not going through the trouble of having to deal with a dead 12V battery.
    hieronymous likes this.
  6. hieronymous

    hieronymous Active Member

    Li--ion batteries are very stable, SoC decline while parked up isn't an issue. I left my gen 1 Leaf for 5 weeks while overseas, no special action taken apart from leaving the car at about half charge, locked the garage and walked away. No change in SoC over this period..
    FloridaSun and Esprit1st like this.
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  8. mikeselectricstuff

    mikeselectricstuff Active Member

    The car draws about 20mA from the 12v battery when asleep. Ignoring other losses, that would take 30 years to drain the traction battery
  9. hobbit

    hobbit Well-Known Member

    If you want to be really sure the traction battery can't self-activate and
    try to boost other things, pull the little "fireman cut here" link near the
    firewall on the pax side. It's got a yellow and red label on the wire and
    it's an easy 2-wire connector to decouple. Stash it inside the car someplace.

    You can also turn off the "fuse switch" on the cabin fuse/relay block,
    but might lose a few presets.

  10. There must be a reason why the Aux Battery Saver is user settable. I would imagine that it's not necessary for people who drive at least twice a week and haven't added a carcam or other non-standard electrical loads. It must be possible to disconnect the 12V battery and have the car survive for the best part of a year in storage.
  11. The Chevrolet Volt has a transport mode that does pretty much the same thing. It's not advertised but there's a button combination to toggle it.
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