The 8% battery loss per day comes from sentry mode. It's draining your battery like crazy.
8% seems like a lot. Car usually stays plugged in at home so I haven't seen it drain. I wonder if it's having trouble since the cameras aren't working, and constantly trying to detect objects or something?
Additionally, once you to the math things look bad: 8% of a battery pack of 60kWh is around 5kWH. 5000 Wh / 24h = 208 W.
200W to keep few cameras on and a small CPU/GPU to run the logic seems a lot. Especially considering that you don't need to analyze every frame of every camera. In fact, you could easily run one frame every 5 seconds making it ~ 1FPS analyzed (6 cameras) since the car is parked.
Additionally, you don't need to run heavy models on all the images. You can run some sort of diff to see if pixels changed within a tolerance threshold between the new and the old image and only if that's true then you run the ML models.