Thank you for the reply and for accepting my first post! It’s great to find a resource like this.
So, if I am understanding you, if she only plugs in her iPhone when she’s on the road, she is draining power from the main pack. If she did stop and switch to accessory mode, she’s draining the 12v, and this is risky unless we upgrade to the battery you described. I’m assuming the 12v “starts” the motor and (from what I’ve read) also powers the cabin heater?
Go easy on me — this is, in fact, my first EV rodeo.