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60% Daily Charge

ratsbew

Active Member
Mar 3, 2012
1,195
877
O'Fallon, IL
We're picking up a new Y for my wife soon. Our plan is to daily charge to 60% always since her commute is very short. I'm hoping to collect data on a VERY gently cycled battery pack...no supercharging and very gentle cycling. Hopefully it doesn't throw the calibration too far out of whack.
 

jcanoe

Active Member
Oct 2, 2020
1,503
1,545
Maryland
You can charge to only 60% daily if you want; any charge level up to 80% daily is probably no worse for the long term health of th battery. A few times per year you should charge to above 94% so that the Tesla battery management system can properly calibrate the upper range of the battery. Also, set Sentry Mode (also Summon/Smart Summon if you have purchased FSD) to not be active when parked at your home location. Sentry mode will use more power, drain the 12V battery faster. This in turn will use more power from the battery pack and require more frequent charging.

Just as important, when Sentry mode is left always active this will prevent the Tesla vehicle from shutting down, entering sleep mode where the high voltage battery pack is disconnected from the vehicle. The Tesla battery management system needs the Tesla vehicle to periodically enter sleep mode to be able to measure the open cell voltage (OCV) within the battery pack. The OCV can only be measured when the battery pack is disconnected from the rest of the Tesla vehicle as in sleep mode.

The down side of not having a properly calibrated battery management system is that the Tesla vehicle could shut down prematurely while driving if the battery management system determines that the remaining charge in the battery pack is too low (when it isn't actually too low) to continue driving.
 

NCC81701

Member
Feb 28, 2020
75
84
San Diego
We're picking up a new Y for my wife soon. Our plan is to daily charge to 60% always since her commute is very short. I'm hoping to collect data on a VERY gently cycled battery pack...no supercharging and very gentle cycling. Hopefully it doesn't throw the calibration too far out of whack.

You should look into using Teslamate or Teslafi to help you collect data. The amount of data you can get from a Tesla is head exploding.
 

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