Turbo - red circle of death, perhaps a fix for my car... but battery idle issue

[rcomeau]

I don't think so, for instance, my ex 2018 Tesla which had a 12v battery was not maintening LV battery when idling.
And I guess, most of the EV cars with 12v system are not maintening 12v battery when off/idling. It's more or less like ICE cars, because this 12v powered onboard systems are directly coming from ICE cars. So your ICE car doesn't maintain the LV battery when the motor is off, why the hell the EV should do otherwise. That's was the main assumption

Be careful not to take a fault condition and project that as normal operation (not sure what idling is on an EV as when the car is not moving, nothing is idling as the electronics are doing the same thing when powered whether the car is moving or not). Many of us EV owners have had issues with their 12V batteries and these were largely caused by failures (either component/software failures, or design flaws). The intent (when working as hoped), is to have the 12V battery maintained by the HV battery at all times within the envelope of reasonable operation (the HV battery has enough juice to keep the 12V battery going). To do otherwise is just inviting the car to need a boost too often since having a HV battery at 50% is useless if the electronics can't power up.

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[BigApple]

Correct.

Yes — the Porsche Macan EV does keep its 12 V battery charged even when the car is parked, but with some conditions and caveats:
How the 12 V battery is charged
The Macan EV uses a DC-DC converter (part of its Integrated Power Box) to supply the 12 V electrical system from the high-voltage traction battery. When the car is awake (driving, charging, preconditioning, running systems), this converter actively maintains the 12 V battery charge. �
macanevowners.com +1
What happens when parked
When you park and lock the car, it goes into a low-power sleep mode to save energy. In that sleep state, the 12 V system isn’t continuously charged like it is when the car is on. �
macanevowners.com
However, the car periodically wakes up to:
check system status
support security/telematics
top up the 12 V battery if its voltage drops — as long as the high-voltage battery has enough charge and there aren’t abnormal drains. �
macanevowners.com
Important things to know
If the high-voltage battery gets very low, the car may stop maintaining the 12 V battery to preserve energy. �
macanevowners.com
During long periods of parking (weeks or months) or in extreme temperatures, parasitic drains (e.g., alarms, telematics) can still drain the 12 V battery faster than it’s replenished. External 12 V maintainers are recommended for long storage. �
macanevowners.com
Porsche recommends keeping the high-voltage battery at a reasonable state of charge during long idle periods (e.g., ~20 – 50 %) to help with 12 V health. �

Yes based on my test now anything below 15%SoC will stop its maintaining of the LV battery.

 

[Philip_1]

Yes based on my test now anything below 15%SoC will stop its maintaining of the LV battery.

Thanks for input.Indeed interesting!

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