I've been using a BT CAN bus adapter and the tesLAX app with some custom signals I've developed to shed some light on the various subsystem's energy consumption. Here's what I've found so far:
I have a 2020 Model S Performance ("Raven"). The base energy consumption sitting in the car with gear in P and all energy consumers switched off or to minimum is 347 W. Aircon is off for all the tests.
Watts: Consumer:
38 Display at 100% brightness (instead of lowest)
79 Low beam headlights
121 Hi beams
33 Brake light
158 One seat heater level 3
125 One seat heater level 2
28 One seat heater level 1 (intermittent, switches off inbetween)
263 Rear window defog
28 Spotify play
23 Hazard lights
14 Dome lights
303 Autopilot (seems to use the same amount regardless of whether TACC+AS or only TACC is engaged).
Surprising learnings from this (for me):
- Playing music uses additional energy.
- Autosteer does not use additional energy. I would have though the servos for autosteer would consume additional energy.
- Seat heaters use interval heating, don't seem to have a permanent on position.
- lights use a lot less energy than I expected
When cruising on a highway doing 100 km/h, this translates into the following Wh/km consumption figures:
- 2 Wh/km when driving at night with high beams
- 3 Wh/km when driving with autopilot
Not that that's news, but any distance record attempts should be done during daylight hours.
I have a 2020 Model S Performance ("Raven"). The base energy consumption sitting in the car with gear in P and all energy consumers switched off or to minimum is 347 W. Aircon is off for all the tests.
Watts: Consumer:
38 Display at 100% brightness (instead of lowest)
79 Low beam headlights
121 Hi beams
33 Brake light
158 One seat heater level 3
125 One seat heater level 2
28 One seat heater level 1 (intermittent, switches off inbetween)
263 Rear window defog
28 Spotify play
23 Hazard lights
14 Dome lights
303 Autopilot (seems to use the same amount regardless of whether TACC+AS or only TACC is engaged).
Surprising learnings from this (for me):
- Playing music uses additional energy.
- Autosteer does not use additional energy. I would have though the servos for autosteer would consume additional energy.
- Seat heaters use interval heating, don't seem to have a permanent on position.
- lights use a lot less energy than I expected
When cruising on a highway doing 100 km/h, this translates into the following Wh/km consumption figures:
- 2 Wh/km when driving at night with high beams
- 3 Wh/km when driving with autopilot
Not that that's news, but any distance record attempts should be done during daylight hours.