Does your Macan EV keep SoC stable when left idle for a week or longer?

[platypus]

Unfortunately this didn’t do it for me. I turned off the battery conservation feature a few months ago after the 1% drain started, and it made no difference.

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[TurboSpain]

Unfortunately this didn’t do it for me. I turned off the battery conservation feature a few months ago after the 1% drain started, and it made no difference.

Ok. Did you notice any difference between the ambient temperature and the battery temperature?

 

[TurboSpain]

Yes, I'd say it matches the outside temperature more or less. At least it's not recognizable that it's way warmer or colder.

Without BMS intervention, the temperatures should be the same after a few hours.

A few degrees difference means energy is being added for cooling or heating. How much? I don't know.

I'll continue testing for a few more days and will report the results.

 

[craz8]

I think it takes a little longer than a few hours for the pack to lose temperature - it is a very dense thing with a high thermal mass, but your point on the extra temperature in the battery is a good one as an indicator of the work being done by the BMS

I think that the 1% drain is related to the BMS not getting to a stable state and stopping its work, so every night it finds work to do. My BMS reset from a few weeks ago did NOT stop me losing charge over time, but I think these are related problems of the software being confused

 

[TurboSpain]

I think it takes a little longer than a few hours for the pack to lose temperature - it is a very dense thing with a high thermal mass, but your point on the extra temperature in the battery is a good one as an indicator of the work being done by the BMS

I think that the 1% drain is related to the BMS not getting to a stable state and stopping its work, so every night it finds work to do. My BMS reset from a few weeks ago did NOT stop me losing charge over time, but I think these are related problems of the software being confused

Yes, that's right, lowering the temperature by 5 degrees to match the ambient temperature can take approximately 15 hours.

This graph, which assumes a mass of 500 kg, can serve as a reference.

For example, assuming a garage with a constant temperature of 15 degrees,
if after 10 hours the temperature is still 3 or 4 degrees above the ambient temperature, it means that energy has been used to heat the battery.

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