In reference to [this post. ](https://www.theverge.com/2024/6/21/24183439/tesla-model-y-arizona-toddler-trapped-rescued)
In: Engineering
I have Toyota hybrids, they also have a 12V battery.
There’s a safety/reliability play also. Have a separate power supply should separate bus voltages – no way that parts designed for 12V can see the battery voltage (277V (I think) in Toyota hybrids). Means the start button can’t somehow see more than 12V.
12V runs the “always on” items to keep drain off the HV battery. Car always has some power draw for unlock/start commands. Teslas must have an inverter/transformer to charge the 12V system from the main battery back (equivalent to an alternator in ICE vehicles).
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