Newbie here, wife getting her 2021 Kona (preferred) six months earlier than expected.

Discussion in 'Hyundai Kona Electric' started by navguy12, Aug 13, 2020.

  1. JellyCat

    JellyCat New Member

    I was just reading some of your comments about your wife’s car. I have a 2019 Kona.
    I do find the steering lacking in precision and it’s just how it is with mine. It does drive in a straight line mostly.
    The winter tires I had last winter were Michelin X-ICE. Car handles fantastic even in a deep snow. I drove it 54 km to and from work on the highway covered in think ice, snow, slush and all when the highway #1 was closed in BC, Canada last winter. Snow is a disaster in greater Vancouver and the valley I will say that Kona handled better than my 4WD Honda with the same tires on.
    The only thing is that energy consumption significantly increase in winter and with soft winter tires. As well, all the sensors at the front get blocked when it’s snowing outside.
    As well, it is really important to disable regenerative breaking if driving in super icy conditions.
    navguy12 likes this.
  2. navguy12

    navguy12 Active Member

    All good observations...and the energy consumption + regen points are spot on with any EV in the winter.


    Our return trip back to home numbers:

    We departed after sunset with 89% SOC (my wife did some driving around town the previous day, thus only 89% versus 90% showing):

    departure SOC 89.JPG

    Conditions required all running lights on and high beams used at least 33% of the trip, dry roads, headwind component of 10 kph, average temperature 5c with an HVAC setting of 20c.

    I like the feature of the HVAC system telling the driver when it is producing heat versus just pushing air.

    Like my TM3 HVAC in winter, I set the HVAC to fresh air only, no AC, fan speed one, airflow to windscreen and floor.

    The trip odometer at the end of the trip (95 kph was the cruise speed):

    home post trip odometer.JPG

    home arrival SOC 30.JPG

    Based on the above data, I estimate the energy consumption was (.154 x 259.5) = 39.96 kWh.

    The trip to Ottawa two days ago (@ 11c, 90 kph and 15 kph tailwind (75 kph "still air" equivalent)) used 33.14 kWh.

    This trip home, with headlamps on, with 6c cooler temperatures and a "still air" equivalent factor (95+10 = 105) that was 40 kph higher, resulted in a 20% energy use increase.


    The trip home used an indicated 59% SOC with 39.96 kWh consumed.

    Based on that information, my estimate for the usable energy capacity of the battery is ((100/59) x 39.96) = 67.72 kWh.

    The 60% push to top-up back to 90% late last night/early today totaled 44.611 kWh:

    Based on the above information, with 44.611 kWh being pushed to raise the battery SOC (90% - 30%) 60%, then it would take ((100/60) × 44.611) = 74.35 kWh pushed to the battery to raise it from a theoretical zero SOC to 100% SOC.

    With both trips, my estimate of 67ish kWh as the available capacity seems good.

    However, rounding errors may have really muddied my first estimate of inverter losses.

    With my second trip estimate of 74ish kWh as the required push from the grid for a full top up, I now estimate the on board charger losses at about 10ish percent.

    So, unless someone can find fault with my math, I think 67 kWh is my usable capacity and I have about 10% inverter losses when charging.
    electriceddy likes this.
  3. Math looks good, the 10% losses during charging is a actually due to the converter (on board charger) ;)
    navguy12 likes this.
  4. navguy12

    navguy12 Active Member


    After bringing myself up to speed on the whole worldwide recall issue, I just confirmed our build date of 24 June, for now, we dodged a bullet...:)
    electriceddy likes this.
  5. Barry T

    Barry T New Member

    I’m a newbie here. This is my first post. Just got our Kona 3 wks ago. So far it’s
    been a great experience.
    I just want to add, the build date was July 26 / 2020
    So I guess we also dodged a bullet. I wonder if anyone here yet knows what’s been
    changed since March ?
    navguy12 likes this.
  6. Curious... is your coolant green or blue?
  7. cmwade77

    cmwade77 Active Member

    My build date is March 2019, but coolant is Blue.
  8. Barry T

    Barry T New Member

    Blue coolant.
  9. Barry T

    Barry T New Member

    I’m curious what the colour of the coolant has to do with the recall. ?
  10. navguy12

    navguy12 Active Member

    It is blue.
  11. navguy12

    navguy12 Active Member

    Welcome to the Forum.

    Here are two threads that should (eventually) capture the precise answer to your question:

    IMHO: the software has been altered to make normal day to day BMS measurements more sensitive than they were before. If the new sensitivity throws an error code, it alerts you prior to some sort of catastrophic battery fire.
  12. wizziwig

    wizziwig Active Member

    Based on your posts, it sounds like you're not aware of the fact that % SOC indicators in most EVs (including the Kona or Tesla M3) are not perfectly linear. This means you can't extrapolate a total kWh rating of full battery by only depleting a few kWh. There will be a large error. To reduce the error, you need to deplete the battery as close to 0% as possible.

    To save you the trouble, others have already done these tests and shown ~64 kWh useable, just as advertised. Exact results will very based on temperature and rate of discharge but you're unlikely to ever pull 67 kWh from the battery.
    Last edited: Oct 17, 2020 at 6:13 PM
    navguy12 likes this.
  13. Barry T

    Barry T New Member

    I’ve been noticing a trend that my 2021 charges the 12 v battery everyday around 3pm
    for about 1/2 hr.
    electriceddy likes this.
  14. Recoil45

    Recoil45 New Member

    The new BMS likely protects the battery from additional damage. Since yours is new it has no previous damage to deal with.

    Sent from my iPhone using Tapatalk
  15. A good trend to have, this thread might be of interest which includes most detailed information concerning accessory battery charging algorithms and monitoring:
    Barry T likes this.
  16. navguy12

    navguy12 Active Member

    Agreed. The most that will probably ever be uplifted in a single recharge event will be 90% later this winter...

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