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Any direct control to battery pre-condition?

Jughead135

Member
Feb 19, 2020
195
83
Georgia
I have a 2020 MSLR+. I see the same range reduction issues as well as limited regen that others post about here in the cold weather.

If I use the "depart at" function, the car pre-conditions. If I turn on the climate controls, the car pre-conditions.

I'd like to be able to separately control the battery pre-conditioning. I can "see" it on the iPhone app's climate page when it's on; but I can't see any way to control it, either on or off. Ideally, I'd like to be able to tell the car "start preconditioning" when I'm heading that way to start a drive--typically at a time I didn't know ahead of time, so "depart at" doesn't help (even if it worked flawlessly, which is another issue)--and without placing additional drain due to cabin heating.

Am I missing some way to do this??
 

zanary

Active Member
Jan 25, 2017
1,376
1,534
SF Bay Area (East Bay), CA
Only the P100D and the Model S/X Performance models have Ludicrous+ Acceleration Mode and the Ludicrous+ Toy Box feature which when activated pre-heat the battery pack to 52C (approximately). It can also take up to 50 minutes to do so depending on how cold the HV pack is when you turn it on.
 

Jughead135

Member
Feb 19, 2020
195
83
Georgia
There is no other way to turn on the battery heater, than to turn on climate. Either manually through the app or by "depart at".


Well, that's what I was afraid of....


OK, follow-on question: any way to determine with reasonable accuracy how long pre-conditioning will take? Rules of thumb?
 

scabbotts

Supporting Member
Jan 4, 2021
32
18
Maine
There is no other way to turn on the battery heater, than to turn on climate. Either manually through the app or by "depart at".
So from that can i assume that whenever i turn on the climate that the battery is being preconditioned, or is the climate control and the battery preconditioning separate functions?
Thanks,
 

random155

Member
Mar 18, 2019
876
450
NJ
So from that can i assume that whenever i turn on the climate that the battery is being preconditioned, or is the climate control and the battery preconditioning separate functions?
Thanks,

I believe they are separate functions. I think when you turn on climate control the car wakes up and identifies that a function has been activated that requires battery draw. In turn, the car starts to heat up the battery while performing the function (heating the cabin). So its like 2 birds one stone kind of action.
 
  • Informative
Reactions: scabbotts

2101Guy

Active Member
Jan 6, 2020
1,418
1,230
USA
Up to 50 minutes depending on the temperature.

agreed. On my 2017, with my garage temps in the low 40's (which is typically about 20 degrees above outside temps), I set my interior cabin temp to 72. In about 50 mins, if I enter the car, I have full regen. If I enter the car 35-40 mins, still dont have full regen.

On my wifes Y under same conditions, even if we leave the garage with full regen, after some driving in the 20f temps, we lose some regen as Im guessing the battery pack cools down some since the cabin heat is relying purely on the (more efficient) heat pump.
 

brkaus

Well-Known Member
Jul 8, 2014
7,717
6,248
Austin, TX
If you're plugged in, you can target your charge to finish with the departure function. That only helps when plugged in and with a low battery of course.

If you are not plugged in, you are going to see the same range reduction if the pack heats up prior to departure or during the drive. It's still energy lost to heat. I guess with the exception of lost regen early in the drive which is small (unless you live on the top of the hill).
 

mswlogo

Well-Known Member
Aug 27, 2018
6,013
4,627
MA, NH
The extended Range button does affect battery heating. It tends to heat the battery less when it’s on. But it has varied its behavior a bit. I just leave that on because I prefer it not waste energy heating the battery I. Just about all situations.
 

140.6

Member
Jul 15, 2019
31
20
Chicago
Well, that's what I was afraid of....


OK, follow-on question: any way to determine with reasonable accuracy how long pre-conditioning will take? Rules of thumb?

If you use some vehicle monitoring app, you can read the cell temps. I use Scan My Tesla, but you need to be within BT range, that is how the app communicates with the car (via a BT dongle). At average cell temp of 62F I have full regen.
 

2101Guy

Active Member
Jan 6, 2020
1,418
1,230
USA
Does charging at home on 14-50 nema 32amps warm up the battery by itself? Or does the battery warm faster when charging AND with cabin heater on?
 

KalJoMoS

Member
Aug 11, 2019
314
189
EETN, EST
Or does the battery warm faster when charging AND with cabin heater on?
No, if you start your cabin heat during your low power charging then you will lose that amount current that is needed to use by the heater, rest will be continue to be user for charging.
 

aerodyne

Active Member
Nov 19, 2018
2,180
1,626
Los Angeles
If you use some vehicle monitoring app, you can read the cell temps. I use Scan My Tesla, but you need to be within BT range, that is how the app communicates with the car (via a BT dongle). At average cell temp of 62F I have full regen.

SMT here as well. Partial regen of 40Kw at 55 deg F. Full regen at 66.

2015 85D.
 

2101Guy

Active Member
Jan 6, 2020
1,418
1,230
USA
So if I’m understanding correctly, I’ll use less electricity on a cold morning AND will warm my battery in same amount of time if I turn on charging with NO climate control on

Correct?
 

KalJoMoS

Member
Aug 11, 2019
314
189
EETN, EST
To get it right, you will use/consume same amount of electricity (from the wall plug) if you do charging with or without cabin heat activated. Your previous question was does it warm up faster if you turn on the heating during charging session - answer was no, because as current draw from mains is the same, your car will use needed amount of power to turn on the onboard heater and as your mains current is not changed your charging power will drop that same amount.
In another way of saying, during low power charging you will not heat your battery (only to the level required to add electricity to battery) enough to gain full regeneration without activating battery heating with the “cabin heating” function.
Everything is different in DC fast charging session.
 

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