Everything inside the cabin runs at 12v. The only area where the gets fuzzy is that your 12v is charged via the main battery, so ULTIMATELY, you are draining the main battery. (Unless you have a poorly designed EV like the early ones that just... Didn't charge the 12v or only did so during charging) So really, anything but driving and using the climate control is... Negligible.
this post was submitted on 21 Nov 2025
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The radio runs off 12V, not the high voltage battery. But while the car is on, the high voltage battery charges the 12V battery. So just leave the car on and you will be fine.
Some ev's also have a camping mode specifically for scenarios like this. But in general as long as you leave the car "on" you're good to go.
I don't know what the hell sites you're on but no radio is going to run off of 400V.
The 400V batt is commonly referred to as the "traction battery". This obviously powers the wheels, but also typically the HVAC and the brake booster, and probably some other things I'm forgetting.
Everything else runs off the 12V (or 48V in case of the Cybertruck).