Regular cars need this. Leave a car for months, and you'll get back to a dead battery. Keyless entry won't work. You can't roll down the windows. Settings may

Regular cars need this. Leave a car for months, and you'll get back to a dead battery. Keyless entry won't work. You can't roll down the windows. Settings may be forgotten. There is no way to start the engine. Leave a car out in the Sun in a place like Arizona, and stuff melts. If you get in the car, the seatbelts cause burns that blister. Having the car run a fan would be nice, and the more you need it the more power there is available to do so.