came back and 80% of my battery had vanished.. help please?

[rnguy001]

Hey guys. I parked my car inside a garage at work, and when I came back 8 hours later noticed the batter was only at 10% whereas normally I have about 60-70%. The HVAC didn't seem to be running or anything. (once I inadvertently turned the HVAC on my app on my other model s).

any ideas what may have caused this? My best guess is I must've done it in the Tesla app (butt dialed the app) when going through my other apps or something..

thanks in advance. Was able to charge at a local supercharger no problem. Car and battery have otherwise been fine, 45K miles.

 

[ATPMSD]

I inadvertently turned the HVAC

Unless something is seriously wrong, something like what you suggested makes sense. Your car will consume "about" 6 kW / hour when the heat is running. So 6 kWh x 8 hours = 48 kWh.

 

[Sophias_dad]

Unless something is seriously wrong, something like what you suggested makes sense. Your car will consume "about" 6 kW / hour when the heat is running. So 6 kWh x 8 hours = 48 kWh.

Even the heat wouldn't explain it, since once the cabin is up to temperature there would be only negligible call for heat, especially in a ~50f parking garage.

 

[ATPMSD]

Even the heat wouldn't explain it, since once the cabin is up to temperature there would be only negligible call for heat, especially in a ~50f parking garage.

Depends on what the actual percentage the OP started at and while it is true that the heater consumption goes down, I don't know that I would call it negligible, I find that when driving on a cold day my consumption goes up about 2-3 kWh, but it can get a lot colder than 50F in MD! I grant you would this alone does not seem to account for the loss, but them add in Sentry (if enabled) and maybe we get closer? In any case, this was just a suggested possibility.

 

[Pianewman]

Unless something is seriously wrong, something like what you suggested makes sense. Your car will consume "about" 6 kW / hour when the heat is running. So 6 kWh x 8 hours = 48 kWh.

Hmm...not sure where you got 6k/W/hour consumption. I slept in my car for 3 consecutive nights during the 4-day freeze in TX, 68f in the car, and it consumed 6% of battery in each 6 hour period...IIRC...

 

[ATPMSD]

not sure where you got 6k/W/hour consumption

6 kWh is “about” the top end of what the heater consumes - assuming we are not talking and a car with the Heat Pump. Consuming 1% / hr in freezing conditions seems very low, but hey, if that is what you got great for you!

 

[Fourdoor]

6 kWh is “about” the top end of what the heater consumes - assuming we are not talking and a car with the Heat Pump. Consuming 1% / hr in freezing conditions seems very low, but hey, if that is what you got great for you!

All model Y's have a heat pump... so this is a car with a heat pump.

Keith

 

[Johnny Vector]

I can't even with this thread.

Power, for instance charging speed or heating system usage, is measured in kW.

Energy, for instance the capacity of the battery, is kilowatts times hours: kWh.

Multiply kW by hours to get kWh. See? Simple!

 

[JimmySure]

Had to be sentry. If you left sentry on in a busy garage with constant motion, I could see it using a decent amount of juice. Especially if you had that AND the heater going.

 

[ATPMSD]

Had to be sentry. If you left sentry on in a busy garage with constant motion, I could see it using a decent amount of juice. Especially if you had that AND the heater going.

Activity does not impact Sentry; it is either on or off.

 

[boulder.dude]

If it happens again, create a service request.

 

[JimmySure]

Activity does not impact Sentry; it is either on or off.

You sure?

“Sentry Mode relies on cameras constantly recording activities around the vehicle once a proximity alert is triggered.”

“Once a proximity alert is triggered” sure sounds like something activity based to me…

 

[ATPMSD]

You sure?

“Sentry Mode relies on cameras constantly recording activities around the vehicle once a proximity alert is triggered.”

“Once a proximity alert is triggered” sure sounds like something activity based to me…

Pretty sure. That is what has been posted by multiple people. Of course we all could be wrong.

 

[dduffey]

If it happens again, create a service request.

Great suggestion. If OP knows the exact times it may not be too late to fill out a service request and ask for them to look at the logs remotely to determine the usage.

 

[jcanoe]

You sure?

“Sentry Mode relies on cameras constantly recording activities around the vehicle once a proximity alert is triggered.”

“Once a proximity alert is triggered” sure sounds like something activity based to me…

In the Tesla vehicle Sentry mode will cause the Tesla vehicle to remain awake due to the cameras and the computer systems needing to remain active. That is why the power drain is so much greater than when the Tesla vehicle is stopped, allowed to enter sleep mode. The difference is almost 10X more power when the Tesla vehicle is awake; 230W when awake versus 25W when in sleep mode.

The Tesla vehicle's 12V battery can power the Tesla vehicle for about a day if the Tesla vehicle is in sleep mode. The 12V battery does not have the capacity to power the Tesla vehicle's 12V systems for very long when the Tesla vehicle is not in sleep mode, the Tesla vehicle remains awake and the power conversion module provides power to the Tesla vehicle's 12V systems drawing power from the Tesla battery pack. This power drain is noticeable, resulting in en effective loss of 1 mile of range per hour from the battery. Sentry mode would not have drained the battery 50 to 60% over 8 hours, would expect 4 or 5% in 8 hours.

When the cameras detect motion or the door handles are tried this triggers a Sentry mode event. Four of the eight cameras have been recording all of the time that Sentry mode has been active. The Sentry mode event triggers the system to save the most recent 10 minutes of video. Triggering multiple Sentry mode events will not use appreciably more power but will fill up the Dashcam/Sentry mode USB storage device. Sentry mode events are saved until you decide to delete the file(s) or reformat the storage device.