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Ideal SOC for limited driving

scerbin

Member
Oct 12, 2018
16
1
Staten Island, NY
Hi friends! I bought a new MS 75D in June 2018 and to date have about 8,500 miles on her (a lot for me - but I've been enjoying the ride and drove a lot this summer!). I have done a lot of reading and research on the battery, charging, etc., and after initially charging to 90+ percent I have started going much lower (like 60% daily charge, which is usually just topping off 10 or 20%). I anticipate driving even less now in the winter, I'm in NYC/Staten Island, and don't use the car to commute every day so 60 usually works me. I know Elon Tweeted a few years ago that 30-80 was ideal and he now seems to have changed his opinion to 5-90; so now I'm really confused! However my question is what if I don't drive every day? Or just drive a few miles to go grocery shopping, etc. Should the car sit there for days at 80-90? My understanding has always been that in the middle (around 50) was best for sitting idle. Or should I just set it to 90 for each morning and enjoy the damn the car that I paid 100K for?
 

Tam

Well-Known Member
Nov 25, 2012
9,428
8,604
Visalia, CA
...should I...

I think Elon Musk was trying to make a battery practical and I think what he says is: it is not worth the worry especially when you have an S or X that has a warranty for infinity miles in 8 years.

Essentially, Tesla only demands 2 things from you:

1) Plug it in (as demanded in your Owner's Manual)
2) Your Tesla would give you a warning when you set it above 90%.
 
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Reactions: bmah

brkaus

Well-Known Member
Jul 8, 2014
8,079
6,644
Austin, TX
It looks like some of the cars get the battery calibration confused if it doesn't occasionally get charged to 90% hence the updated recommendation.
 

dark cloud

Active Member
Apr 14, 2018
2,083
2,437
BC
When did Elon state you should charge using a 5-90 SOC on regular basis?

This should only be done periodically (annually or semi-annually?) for balancing the pack, and I believe the consensus is still >90 and more like 95%.

Sure the car can sit there for days at 80-90%, until it gets below say 40%, but why not just keep it plugged in at 70% if you don't need the range?

From everything I have read also I think your statement that keeping the SOC around the middle as much as possible is the best thing you can do for your battery.
 

boonedocks

MS LR Blk/Blk 19” OD-1/1/21 RN#1143376 DD 9/4 11am
May 1, 2015
3,146
5,863
Gainesville GA
Just did a 100% charge this weekend and have 323 miles which is 12 miles short of the what is was advertised at new......a drop of 3.6% of total battery capacity.

Daily charge 90% and plugged in all the time when at home
Car is 22 months old
63,669 miles

Battery degradation of 3.6% after almost 2 years and 64k miles is pretty good in my book!!
 
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Reactions: dark cloud and bmah

scerbin

Member
Oct 12, 2018
16
1
Staten Island, NY
Just did a 100% charge this weekend and have 323 miles which is 12 miles short of the what is was advertised at new......a drop of 3.6% of total battery capacity.

Daily charge 90% and plugged in all the time when at home
Car is 22 months old
63,669 miles

Battery degradation of 3.6% after almost 2 years and 64k miles is pretty good in my book!!
Thats awesome and encouraging. It seems that Tesla is doing something different and it defies established rules of li-ion batteries.
 

Lasttoy

Active Member
Mar 24, 2017
1,620
957
St Augustine, Fl
Read attached .
I have 131k miles, i still get something close to 250 if i set at 100%. I dont want to do that. I was told by Tesla never to do that.
They told to have 2 settings,
1. Home, about 175 for me to get to next town and back
2. Going on long trip with many stops, (DC). Set it to about 240. Shortens stop times.
Also, u will never calculate any miles used, or available, there are too many variables.
I've driven in over 25 states and a lot of different environments, good luck on that .
 

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shred86

Member
Dec 18, 2018
244
221
USA
Thats awesome and encouraging. It seems that Tesla is doing something different and it defies established rules of li-ion batteries.

Tesla made a smart choice in the type of lithium-ion batteries they use. Jeff Dahn goes into detail in his lecture on lithium-ion batteries which explains it. Tesla also has a very good Battery Management System (BMS) which further improves the longevity of the battery packs (temperature management, cell voltage balancing, etc.). As @Tam mentioned, Elon Musk is basically saying to not worry since the difference in degradation between lower charge states up to 90% is very small compared to the convenience of having extra range. Unless you plan on owning the vehicle for a very long time (8-10+ years) or drive a significant amount of miles every year, just follow Tesla’s simple recommendations which is essentially: 1) Charge <=90% for daily use, 2) Keep it plugged in, 3) Only charge >90% for long range trips, if required. If you want some more details, I made a fairly lengthy post in this thread.
 

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