rennlistfan

What SoC % is recommended if I'm leaving for vacation and the car will sit in the garage unattended for 2-3 weeks? I'm trying to lower battery fire risk even if it's rare during my absence. Thanks.

Old news:
https://electrek.co/2020/02/17/porsc...arage-florida/

daveo4porsche

SOC has very little to do with any minimal fire risk (I'm unaware of any correlation between battery SOC and increased fire risk but I welcome data or references), but storage long term (2-3 weeks or more) at 50% SOC is recommended for battery longevity/health - the sweet spot for LiON battery longevity is 30-60% SOC - storing LiON cells at full capacity for long periods of time is know to be stressful for battery longevity - and storing the battery at too low of an SOC is equally stressful and runs addition risk of "running out of juice" and hitting 0% SOC or actual 0% SOC…storing the EV with enough power to not come close to 10% or lower - but not so much power that the battery is near is "full" is the ideal SOC for long term storage - Porsche and others also recommend leaving the EV plugged in so that the vehicle can charge the main battery if necessary as it is used to maintain the 12V battery…

the car may "use" the battery during storage to charge the 12V system, and run battery conditioning if things get too cold or too hot - it's best to have sufficient power for the vehicle to maintain optimal battery thermal conditions - so having the battery charged and extra power on tap means the vehicle is free to use the battery as it sees fit for battery health/longevity - also best to store it someplace out of direct sunlight - an exposed parking lot in Phoenix AZ in July/Aug for example may not be the best place to store an EV for weeks at a time - just as one example - cool, dry, and shaded location if possible is best.

I'd recommend a profile to keep the battery at no more than 60% SOC during storage and leaving it plugged in for periodic charging under control of the vehicle's timers/profiles.

Mr_Marty

40-60%. I have a "Storage" profile that I use with the SoC set to 60%.

d00d

References for those percentages?
Isn't leaving it for one day or three weeks the same, in that it has a range of healthy values, but one is best?
Porsche seems to indicate 25% is that value, as that's the minimum preset.
I use 30% so if I take a short trip away from being plugged in, I can still precondition before returning, which can't be done unplugged under 25%.

Spyerx

I’ve try to leave the car at about 50% if I’m not going to drive it for a week or 2. I also try not to think about it too much…

tcbrown

This is a topic that has turned up so many different recommendations on both this site and TaycanForum that it is hard to know what is the right way to handle long term storage. I should include Porsche in that list as I’ve tried to get answers from them and get nothing definitive as well.

991carreradriver

^ +1 - I have left my car at 50%-55% for 4 weeks and have never had an issue.

AlexCeres

For 2-3 weeks I’d just charge it to 80-90% and leave it unplugged. The drain rate on these is very very low. I regularly have left it for 2-3 weeks, with imperceptible loss. Like maybe 1% a week.

Mr_Marty

My theory is 60% because that ends up being about 50% when you account for the hidden capacity.