From my understanding the problem is that the computer just....doesn't sleep if you have Sentry mode running. It's not that it's sleeping for a few seconds and then waking up, it's just fully awake drawing it's normal base load, which for HW4 [1] appears to be ~300W.

A good way to verify this if you've got a Tesla is how long it takes for the car to acknowledge commands sent via the mobile app. If they're near-instant (ignoring TCP latency ofc), the car is "Awake" and drawing it's full load. If they take 5-15 seconds, the car is Asleep and only polling it's LTE antennas for push notifications every 10s or so. If they timeout entirely, the car is in Deep Sleep and drawing almost no wattage (at least based on my observations with my wife's M3).

When in Sentry mode, responses are ALWAYS instant, so the car is fully Awake and drawing full wattage.

[1] https://teslatap.com/articles/autopilot-processors-and-hardw...