the 12v system pretty much runs everything bar the Aircon. The traction battery will check and top up the 12v battery every day. The yellow light on front of bonnet will come on while it’s doing this. That denotes the hi voltage battery is active. Obviously it comes on when your conditioning the interior too.
Current Car: Hyundai Kona Premium EV...2 way 40kg hoist
Last Car: Toyota C-HR Excel Hybrid...4 way 80kg hoist