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Losing 9 miles of charge overnight.

I noticed this again today. It isn't always happening but a few times now, I'm down 9 miles overnight. Well I park around 5PM and leave about 7AM so 14 hours. There are other times where range hasn't changed. What's the best way to track down what's going on?

I'm on the 2018.14.13 firmware.
 

CO2CLEAN

Olivier Willemsen
Apr 3, 2015
3,145
2,740
Netherlands
I noticed this again today. It isn't always happening but a few times now, I'm down 9 miles overnight. Well I park around 5PM and leave about 7AM so 14 hours. There are other times where range hasn't changed. What's the best way to track down what's going on?

I'm on the 2018.14.13 firmware.

Could it be related to (autopilot)data sent from the car to Tesla? This won't happen every day/night, but regularly. It will keep certain systems on while they would otherwise be in sleep/off.
 

apacheguy

S Sig #255
Oct 21, 2012
5,119
1,309
So Cal
Could it be related to (autopilot)data sent from the car to Tesla? This won't happen every day/night, but regularly. It will keep certain systems on while they would otherwise be in sleep/off.

How big are the AP logs? Maybe 100 MB at the large end? It shouldn’t take the vehicle more than 30 minutes to upload that data with modern internet speeds.
 
Go do a search for "vampire drain" in the forum. You'll see numerous threads regarding this topic. At the end of the day, nobody has a clear answer of why the car drains on certain days and not others. Having said that on my good days, I get 1-2 miles drain and others I get 6-7 miles on an overnight drain. The latest software dropped that drain down from 10-15 miles in a 24 cycle to 6-8 miles. I think we've exhausted all the plausible scenarios (weather, software, and sleep cycles). Have not been able to isolate out the culprit

The two remaining explanations exist at this time:
1) I read somewhere that Tesla engineering says this drain is typical for newer batteries and will stabilize over time (not sure I buy it)
2) Tesla is doing a ton of data collection and hence not allowing the car to sleep (not just AP)

With both these explanations, we kinda have to trust that Tesla knows what it is doing and that the drain will stabilize as it has with the S/X. I kinda have stopped worrying about it since there isn't much we can do or hope for
 
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I don't have AP so it's not that. And bonus...overnight I gained 2 miles. 234 -> 236. /shruggie
I think it may still be calibrating. It reminds me of my first gen leaf where updates kept changing the listed range. I do hope it settles down, but losing 9 miles just being parked seems like a flaw.

I did look at vampire drain threads. I also think it's they key fob shortcoming. They are not letting the car deep sleep in order to make the phone as key work better. I know mine has started working more reliably after the last 2 firmware updates.
 
I periodically measure various options (semi-scientific like!) when I am on 2-4 day trips to see how they affect vampire drain. All measurements are taken inside a non-insulated but fairly stable (around 60 degrees F) garage in Northern California (i.e. not inclement weather!)

I haven't yet added trying to factor in software download speeds but may do that in the future.

Ignoring downloads, the biggest impact will be leaving on Smart Pre-Conditioning. Useful feature but it consumes a lot of energy. I leave it on most of the time because losing 5-7 miles overnight isn't a big deal for a day or even a few days at home with my short commute. But if I was to park in an airport and leave it for a while where cold(er) weather and a longer drive upon my return, I'd definitely turn it off. "Energy saving" option (in my few data points anyhow) also seems to have non-trivial impact.

FWIW. YMMV. All the other disclaimers ;). Here's my current data for my 2017 75D

Screen Shot 2018-04-25 at 9.58.27 AM.png
 
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apacheguy

S Sig #255
Oct 21, 2012
5,119
1,309
So Cal
I don't have AP so it's not that. And bonus...overnight I gained 2 miles. 234 -> 236. /shruggie
I think it may still be calibrating. It reminds me of my first gen leaf where updates kept changing the listed range. I do hope it settles down, but losing 9 miles just being parked seems like a flaw.

I did look at vampire drain threads. I also think it's they key fob shortcoming. They are not letting the car deep sleep in order to make the phone as key work better. I know mine has started working more reliably after the last 2 firmware updates.

Even if you don’t have AP enabled, that doesn’t mean it’s not there. All Model 3s have AP hardware and it is still collecting data in shadow mode.
 
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