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Max charge to leave at car for a week

I will be leaving my x at the airport in Atlanta for 8 days. When I get back I will have a 200+ drive to get back home. I am trying to make it home as fast as possible so i am trying to determine how much is maximum charge that I can safely leave it at for that time period. Can I leave it parked at 90% for 8 days without putting too much strain on the battery? I expect 1-3% battery loss per day.
 

aesculus

Still Trying to Figure This All Out
May 31, 2015
4,623
2,652
Northern California
90% is a normal charge to value no matter what. I am not sure what the issue you are worried about is.

Unless you have a 100D and a tailwind, I doubt you are going to make the 200 mile return trip after losing 10% to 20% in vampire drain, so you are going to have to charge somewhere on the way home.
 
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Thanks for the quick reply. The 90% charge notch is the first notch in "Trip" notches. I know you aren't supposed to leave the battery fully charged for long periods so I just wanted to make sure 90% was ok to leave the car parked at. The most recent thing I read was that 70% was the ideal daily charge state for battery health. I know I have to make a stop to charge, but wanted to have as much charge as possible when i get back to make it to the supercharger that is 150 miles along my route without having to charge at the airport too. Also want to limit charge time.
 

Tech_Guy

ALWAYS IN LUDICROUS MODE! P90D>P100D Upgrade
May 6, 2016
1,173
2,046
Los Angeles
you could make some changes to get less vampire drain on the battery as well...

1 turning off cabin overheat protection
2 Always Connected' must be turned off.
3 Energy Savings' must be turned on.


as far as long term usage, charge to what you need on a daily basis however less charge will equal more lifespan as you have read. Charging to around 70% will give you much more lifespan vs 90 but if you really need to use more then 70% of your battery then charge more. Also if you use less then you could charge less on a daily basis. Personally I charge to 60% daily but if I know I need to travel further tomorrow ill set my car to charge more tonight to be prepared.


Heres a chart showing a general example of how charge percentage of a lithium ion battery relates to they number of cycles you get. These aren't exact numbers for a Tesla but it gives you an idea of how reducing your daily charge limit can increase the cycle count.

Screen Shot 2018-05-18 at 10.08.43 AM.png
 
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aesculus

Still Trying to Figure This All Out
May 31, 2015
4,623
2,652
Northern California
The notch at the end, 90%, is the top of the daily charge level. The range charging starts after that.

There has been a debate for years about 80% being ideal. I see this quote from Jeff Dahn, a renowned battery researcher in Electrek that states he thinks that 70% is the ideal daily charge level. The manual states 70% to 90% for longest life. So going to 90% a few times is certainly not going to be a big issue.
 

TexasEV

Well-Known Member
Jun 5, 2013
7,650
8,914
Austin, TX
I charged my Model S to 90% every night for five years, except when I charged to 100% for trips. No worries. Did you know that early versions of the firmware, before the slider was introduced, had only two settings “daily” and “trip”? The daily setting was 92%.

Whether you routinely charge your car to 80% or 90% may give a statistically significant difference after many years but it’s not clinically meaningful.
 

terrywhite

Member
Mar 29, 2018
150
274
Atlanta GA
The ATL airport parking lots/structure has Chargers at no additional cost. They are slow (4-5mph) but that’s not a problem since most EVs will be plugged in for days. Just leave it plugged in and you’ll be at 90% when you return. Vampire drain will happen but once it drops 10% it will top you off again. You can also remotely set the charge to 100% the night before you return.
 
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