Since the BMS updates in Fall of 2020 my car charges the 12 volt very, very frequently. Several times a day. In the first year of ownership it took me six months before I ever saw the light on the grill. Ever since I see it several times a day.My Kona keeps regularly re-charging its 12V battery when on EVSE and high voltage battery charging session is completed.
I keep my car locked with all doors closed when charging.
Since the BMS updates in Fall of 2020 my car charges the 12 volt very, very frequently. Several times a day. In the first year of ownership it took me six months before I ever saw the light on the grill. Ever since I see it several times a day.
Have you noticed any correlation between use of the interior heater in Winter and your 12 v battery being discharged so much that your Kona Electric would not start without an external "jump start"?
My 2020 Kona Electric 12 v battery frequently died in the Winter (Dec 2020 and Jan 2021) after I had been using the heater. My 2021 Kona Electric did not have problems starting until I started using the heater in January 2022. The 12v heater probably draws the largest amount of current from the 12v battery. The DC to DC converter should keep the 12v battery topped off, but may not be keeping up when the heater is used.
When you run your heater, is the car actually “ready to drive”?Have you noticed any correlation between use of the interior heater in Winter and your 12 v battery being discharged so much that your Kona Electric would not start without an external "jump start"?
My 2020 Kona Electric 12 v battery frequently died in the Winter (Dec 2020 and Jan 2021) after I had been using the heater. My 2021 Kona Electric did not have problems starting until I started using the heater in January 2022. The 12v heater probably draws the largest amount of current from the 12v battery. The DC to DC converter should keep the 12v battery topped off, but may not be keeping up when the heater is used.
When you run your heater, is the car actually “ready to drive”?
Reason I ask: it took a few weeks to get my wife to understand that when she would get into the car and just push the start button without her foot on the brake, it was only the 12 volt battery feeding juice to everything (even the HVAC fan). Having the car alive but not ready to drive will quickly drain the 12 volt battery.
Yep, that could be it. Just the load from some electronic systems, HVAC fan and main battery contacter would draw a fair amount of current off the 12V battery.... and just push the start button without her foot on the brake...
There has been one report in the Hyundai Ionic 5 forum where the car didn't charge the 12V accessory battery as well at a lower SOC, I tend to believe that at extremely low SOC but 40% seems awful high. I would take the car back and have them check the LDC software is up to the latest revision(if this is indeed the case).So you have tested that if HV Battery SOC drops below 40% SOC, 12 V battery is not being topped up anymore?
Also i believe BMS has nothing to do with that. VCULDC module controls 12V battery charging/topups.
There has been one report in the Hyundai Ionic 5 forum where the car didn't charge the 12V accessory battery as well at a lower SOC, I tend to believe that at extremely low SOC but 40% seems awful high. I would take the car back and have them check the LDC software is up to the latest revision(if this is indeed the case).
Battery replacement incl. software wasn't done by the dealer, but by Hyundai NZ at their head office site on 1 June. On 3 June the car had its annual service by the dealer, plus transfer case oil replacement. I would tend to believe all updates have been done..There has been one report in the Hyundai Ionic 5 forum where the car didn't charge the 12V accessory battery as well at a lower SOC, I tend to believe that at extremely low SOC but 40% seems awful high. I would take the car back and have them check the LDC software is up to the latest revision(if this is indeed the case).
True, I was told by the dealer in Napier long ago that the battery replacement program was being handled by the importer and that relevant BMS updates would be applied at that time. Still waiting for this, however ...Battery replacement incl. software wasn't done by the dealer, but by Hyundai NZ at their head office site on 1 June. ... I would tend to believe all updates have been done..
That would be far too long as the condition can change much more quickly. I use a 5W solar panel to keep my ICE battery fully charged when parked and it does work very well, even in winter, but it has no means of regulation and can exceed 15V at times so I have to keep an eye on it. During summer I'll either use a 1.5W panel instead or just turn over the 5W so it's facing the ground. The pic below is a mid-winter but sunny day.I wonder if manually charging the 12 v battery every 3 or 6 months would help extend the battery life
I use a 5W solar panel to keep my ICE battery fully charged when parked and it does work very well, even in winter, but it has no means of regulation and can exceed 15V at times so I have to keep an eye on it. During summer I'll either use a 1.5W panel instead or just turn over the 5W so it's facing the ground. The pic below is a mid-winter but sunny day.
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My Auckland dealer is also doing replacements - I’ve observed a truckload of new batteries arriving while picking up the car after the 3 June service.True, I was told by the dealer in Napier long ago that the battery replacement program was being handled by the importer and that relevant BMS updates would be applied at that time. Still waiting for this, however ...
The Kona will not care about this and will only know about the added charge if the ground connection from the solar panel is made to the chassis instead of the battery (-) terminal. I doubt it matters either way because it's not a lot of power.I'd like to use a small solar panel of about this size to keep my Kona 12V battery charged.
1) Will using a small-wattage solar panel interfere with VCU(Vehicle Control Unit):LDC(Low voltage DC-DC Converter) work to keep the 12 V topped up?
2) How can I most inconspicuously connect the panel to the battery?
Curiosity got the better of me and I was able to show that it happens as well on my early model, updated only as far as Campaign 196 several years back.... My conclusion: at least under the latest BMS software, there are no 4-hourly, 12-volt battery top-ups if SoC is less than 40%....
Thanks for the info, just have to keep the SOC above 40% (which I do anyway). Certainly nothing mentioned in the user manual about thisCuriosity got the better of me and I was able to show that it happens as well on my early model, updated only as far as Campaign 196 several years back.
I'm becoming somewhat convinced that balancing is being carried out after traction battery charging because it's in good balance and I've haven't been over 80% in more than a year. The 12V sag of course is because the BMS has to read cell voltages as OCV, open-circuit voltage.
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That spike is a 5 min drive and the one following is a 20 min drive.... which typically are like the single spike at 9am/29 July in your 1st pic. ...