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 for my 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.
Energy consumption with the car off appears variable. I switched the car off and waited 5 minutes. There are still some fans audible, and some occasional relay clicking. The resulting energy consumption fluctuates between 120 - 200W in the off state. I haven't waited until the car is asleep, however, that figure can be estimated using e.g. teslafi.
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 and driving manually.
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.
Code:
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
30 Front fog lights
5 Rear fog lights
303 Autopilot (seems to use the same amount regardless of whether TACC+AS or only TACC is engaged).
Then some tests to get air circulated in manual mode but with aircon/heater off:
40 Blower level 1
50 Blower level 2
60 Blower level 3
65 Blower level 4
90 Blower level 5
110 Blower level 6
140 Blower level 7
190 Blower level 8
240 Blower level 11 (note that levels 9-11 automatically engage recirculation so will be of no use when not used in conjunction with aircon/heater)
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 and driving manually.