How should I plug in my vacuum cleaner? Newbie ???

Thank you. Even when I'm plugged into the house I still have to switch my 12v on to get the interior lights to work so I was assuming the power outlets ran off of the battery (like my Black & Decker battery charger/air compressor unit has 110 plug ins)as the outlets do sit at the foot of the front passenger seat right where the batteries are.

I'll be sure there is nothing else running except the microwave clock when I vacuum. Thanks again.
Kay