4 ms·

Why don't they reserve some power just for that or have a separate battery using different technology? It's not a rocket science to have a low capacity battery

• falcolas 3y ago
  FWIW, the low voltage system is separate from the high voltage system in most vehicles with electric drivetrains.
  • bryanlarsen 3y ago
    Are you aware of any that don't have a low voltage battery?
    • falcolas 3y ago
      Nope. Low voltage batteries are generally a bit more susceptible to the cold, since they don't have heaters and have a lot of constant draw circuits attached to them.
  • comboy 3y ago
    Do you know how do these teslas become dead? I mean after you cut off wireless communication, wouldn't they be able to stand in freezing temperatures for years even with lithium based batteries? I know capacity will be reduced, internal resistance higher etc but still I don't get how do they discharge enough not to even be able to open the door.
    • falcolas 3y ago
      Low voltage circuits have constant draws attached to them. Simple circuits like keeping clocks ticking, and more complex circuits that listen for wireless keys or alarm sensors. Ideally, they can last for months with those draws, but when the battery is old and cold, it can die in weeks or even days. FWIW, the high voltage circuits (the one with the Li batteries) are physically disconnected with a contactor (a high voltage relay) once the car is turned off. You can literally hear the clicks inside the car as you turn it on and off. All that said, I have heard of some cars which can charge the low voltage battery using the high voltage circuit, but I know nothing of those those are connected.