After the recent update I wanted to see how the battery heater feature works and how much energy is used doing so.
Had the Model S parked outside overnight in -22 C (-7 F). In the morning the battery temperature was -6 C (21 F). I used the app to preheat the car for about 40 min and measured the energy consumption via CAN bus.
Here is a graph of battery temperature and battery power.
The cabin heater and battery heater combined use up to 11 kW. You can see how the battery temperature goes up to 12 C (54 F). So it seem the battery heater continues to run up to 12 C. Usually it shuts off once the battery has reached 8 C (46 F). You can see the drop in power consumption in the graph.
For the entire preheat session the car used aprox 7.5 kWh of energy. When the car is plugged in, this power comes from the grid. In my case I did not have it plugged in to be able to measure the energy.
Had the Model S parked outside overnight in -22 C (-7 F). In the morning the battery temperature was -6 C (21 F). I used the app to preheat the car for about 40 min and measured the energy consumption via CAN bus.
Here is a graph of battery temperature and battery power.
The cabin heater and battery heater combined use up to 11 kW. You can see how the battery temperature goes up to 12 C (54 F). So it seem the battery heater continues to run up to 12 C. Usually it shuts off once the battery has reached 8 C (46 F). You can see the drop in power consumption in the graph.
For the entire preheat session the car used aprox 7.5 kWh of energy. When the car is plugged in, this power comes from the grid. In my case I did not have it plugged in to be able to measure the energy.