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Battery Charging

Chirojan

Member
Jul 17, 2019
23
2
Miision Viejo, Ca
I generally charge to 85%. 2019 3 Standard+
Each Sunday I drive to see my parents uses 180 mileage equivalent. So Saturday night I fully charge before the trip. Is there a best way to do this?
Also Is there a problem leaving the cord in the 220 line?
 

gecko10x

Member
Jan 22, 2018
265
165
WV
The best way would be to calculate the time to charge to full (personally, I'd just do 95-98%, as that last couple will take longer and get you almost nothing), then time it so it finishes charging just when you leave. Leaving the battery sitting at full isn't good for it (worse in higher ambient temperature).
 
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jamnmon66

Member
Apr 10, 2018
572
416
Brighton, CO
The best way would be to calculate the time to charge to full (personally, I'd just do 95-98%, as that last couple will take longer and get you almost nothing), then time it so it finishes charging just when you leave. Leaving the battery sitting at full isn't good for it (worse in higher ambient temperature).
+1 follow gecko10x's advice. Time the charging so that it finishes right before you leave home.

The issue isn't so much that you're charging to 100%. It's the amount of time that it sits fully charged.
 

NickFie

Member
Sep 28, 2017
562
648
Near Philadelphia, PA
I charge to 90% overnight. Then set limit to 100% when I wake up, start charging again.

Charge completes during shower, breakfast, car packing. Battery is also warmed up for the trip.

No problem leaving connector plugged in when car is not charging.

Also, in cold weather, turn on cabin heat while car is plugged in. More efficient than pushing power into battery, then pulling it out to heat the car. Also leaves more juice in the battery for later.

Finally, I think occasionally completely charging to 100%, until charging completes, is good. Allows battery management system to completely balance the packs. Obviously, set off on your trip very soon after the full charge.
 

5_+JqckQttqck

Active Member
Apr 27, 2018
1,851
1,404
Toronto
I generally charge to 85%. 2019 3 Standard+
Each Sunday I drive to see my parents uses 180 mileage equivalent. So Saturday night I fully charge before the trip. Is there a best way to do this?
Also Is there a problem leaving the cord in the 220 line?

Take the charger with you and charge at the destination. It'll get you maybe 30miles of buffer and keeps the battery happy.
 

dhrivnak

Active Member
Jan 8, 2011
4,514
3,932
NE Tennessee
I generally charge to 85%. 2019 3 Standard+
Each Sunday I drive to see my parents uses 180 mileage equivalent. So Saturday night I fully charge before the trip. Is there a best way to do this?
Also Is there a problem leaving the cord in the 220 line?
No problem leaving the 240 cord plugged in. It is the plugging and unplugging that causes issues. And i know of no way to automatically do a full charge just in Friday’s. So just try to remember the day before. Set a phone reminder and set via the app.
 

captn_bob

Member
Jan 8, 2020
14
1
Corvallis
What is better to do .
I commute daily about 35 miles per day round trp.
Is it better to charge it up every day (to 90%) or better to wait to charge it after it runs down to a certain level.
 

frankusb

Member
Jan 2, 2019
58
45
Texas
What is better to do .
I commute daily about 35 miles per day round trp.
Is it better to charge it up every day (to 90%) or better to wait to charge it after it runs down to a certain level.

I have a similar situation, I charge to 60%. The battery life is best around 50%. 55% might be more optimal for me.
 

Sparkler

Member
Jun 25, 2019
19
13
California
Wow - I'm not as fastidious as that. If we're going some distance on the weekend I simply change the charge level from my iPhone in the evening and it's fully charged by morning. Unplug and go. Are these batteries really that delicate?
 

Knightshade

Well-Known Member
Jul 31, 2017
13,673
23,267
NC
Wow - I'm not as fastidious as that. If we're going some distance on the weekend I simply change the charge level from my iPhone in the evening and it's fully charged by morning. Unplug and go. Are these batteries really that delicate?


No. They're not.

Set charge limit to 80 or 90 percent.

ALWAYS plug it in when home (user manual even says to do this)

Also change the displayed range to % so you don't waste 50 posts freaking out about how it says you have 3 miles more or less range this week than last as some folks do. You'll thank me later.
 
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ElectricIAC

Devil’s Advocate
Dec 31, 2019
2,661
1,751
DFW
They’ve designed these cars to set it and forget it at 80-90% I mean I suppose in theory you could make it last longer overall if you micromanage 50-70% like some do but chances are you will trade/sell/wreck the car before some minute difference in battery life rears it’s ugly head.

Make it a habit to plug in whenever it’s convenient and be happy!
 

Wennfred

Active Member
Supporting Member
Apr 4, 2019
3,052
2,125
San Diego
From reading these forums on battery degradation, those that charge to 70% are seeing a range lost as the battery’s memory thinks it suppose to be that low. Then they have to do the 3x 10% to 100% calibration which is a pain if you don’t have a Supercharger nearby.

SR+ .... Ive charged at 90% daily, battery still shows 239-240 at 100%. 11 months 14,900 miles

Fred
 
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Knightshade

Well-Known Member
Jul 31, 2017
13,673
23,267
NC
From reading these forums on battery degradation, those that charge to 70% are seeing a range lost as the battery’s memory thinks it suppose to be that low. Then they have to do the 3x 10% to 100% calibration which is a pain if you don’t have a Supercharger nearby.


That's not a loss of range- that's the reported range being inaccurate.

(it's another good reason to change the display to just be % and stop worrying about it)
 

sdorn

Director of Awesome
Supporting Member
Oct 9, 2016
1,044
1,057
Georgia
I had my Model S for 3 years. Max range dropped from 318 brand new to about 308 by the end of my lease. I had about 30,000 miles on it over that time. I always charged to 90% every night and charged to 100% probably 30 - 40 times while I owned it. I usually would charge to 98% the night before a trip and then set it to 100% about 30 minutes before I left so that it would be absolutely maxed out when we left on the trip.

I am treating my M3 the same. I charge to 90% every day and have charged to 100% once when I had a lot of driving to do one day. I expect it to do even better than my MS given the battery and software improvements over the past 3 years.
 

XLR82XS

D M C
Jul 26, 2019
3,161
1,963
SWFL | Vegas
They’ve designed these cars to set it and forget it at 80-90% I mean I suppose in theory you could make it last longer overall if you micromanage 50-70% like some do but chances are you will trade/sell/wreck the car before some minute difference in battery life rears it’s ugly head.

Make it a habit to plug in whenever it’s convenient and be happy!
Amen. I plug in all the time at home when not in use and SOC 90% daily - 100% trips over 2 hours. I follow recommendation from the manual and enjoy without worries.
 

SomeJoe7777

Marginally-Known Member
Mar 28, 2015
2,200
5,803
Houston, TX
If need to charge to 100% and know when you're leaving, use the scheduled departure feature in the charging menu, and set the time the night before. The car will complete the 100% charge right as you want to leave, and will also have the cabin conditioned for you.

This will reduce the time that the battery spends charged to 100% to a minimal amount.
 

Knightshade

Well-Known Member
Jul 31, 2017
13,673
23,267
NC
If need to charge to 100% and know when you're leaving, use the scheduled departure feature in the charging menu, and set the time the night before. The car will complete the 100% charge right as you want to leave

Unless you want to leave after 6 AM.

Because it stops at 6 AM no matter what departure time you set.
 
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PianoAl

Member
Dec 15, 2019
965
600
Far Northern California
The best way would be to calculate the time to charge to full

You can actually let the car calculate it. Plug it, set it to charge immediately, note how long it says it will take, then set it to charge at a later time.

The "Set departure time" is fine, except that currently, it won't honor a departure time after 6 AM.
 

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