So the temperature has been around -20F for most of the last few days, and our Tesla X100D is parked in an attached garage with pipes in the ceiling overhead that have had issues freezing in the past.
On Sunday night around 10pm, with the garage temperature approaching freezing, we rolled down the windows of the X, opened all doors, and turned on the cabin heat (front and back) at full blast on MAX temperature, and charged the battery from 80-90% (to get some heat going faster). Then we forgot about it and fell asleep.
Around 4am I woke up sweating, went down to the garage which the Tesla reported as 109F inside the cabin (and it certainly felt like that throughout the garage), and noticed what appeared to be the battery _cooling_ system running at full blast (the loudest I've ever heard it). I turned off the cabin heat on the Tesla and opened the door to the house to dissipate the heat, and the battery cooling system kept going, then eventually came to a stop over the next half hour.
It would appear that the temperature in the garage as a result of cabin heating exceeded a certain limit causing the battery cooling system to kick in, and resulted in a thermal runaway condition (for the car at least, though perhaps eventually limited by heat dissipated out of the garage). While 109F would appear to be below anything dangerous, I would think it can't be good for the battery long-term. Though it certainly makes for a great space heater!
Does anyone know if the software would detect such condition and stop the heating and/or battery conditioning after reaching a certain limit? Or is using a Tesla as a space heater a bad idea all around?
On Sunday night around 10pm, with the garage temperature approaching freezing, we rolled down the windows of the X, opened all doors, and turned on the cabin heat (front and back) at full blast on MAX temperature, and charged the battery from 80-90% (to get some heat going faster). Then we forgot about it and fell asleep.
Around 4am I woke up sweating, went down to the garage which the Tesla reported as 109F inside the cabin (and it certainly felt like that throughout the garage), and noticed what appeared to be the battery _cooling_ system running at full blast (the loudest I've ever heard it). I turned off the cabin heat on the Tesla and opened the door to the house to dissipate the heat, and the battery cooling system kept going, then eventually came to a stop over the next half hour.
It would appear that the temperature in the garage as a result of cabin heating exceeded a certain limit causing the battery cooling system to kick in, and resulted in a thermal runaway condition (for the car at least, though perhaps eventually limited by heat dissipated out of the garage). While 109F would appear to be below anything dangerous, I would think it can't be good for the battery long-term. Though it certainly makes for a great space heater!
Does anyone know if the software would detect such condition and stop the heating and/or battery conditioning after reaching a certain limit? Or is using a Tesla as a space heater a bad idea all around?