Electrical Question -- Grid Tie Power Inverters for Home Use Since we are being careful let us assume we have a doll house that is powered by only a 12v source. Inside the doll house, Julie, the doll living there, gets it in her head to construct a 1.2v solar system on the roof of her doll house. Luckily she realizes that she has an old 1.2v to 12v, DC to AC inverter in her doll garage. Julie doesn't want to mess with batteries and the cost of having to replace them every couple years, especially since there are so few doll battery dealers in her area. Julie wonders as she's watching TV one evening if she can't simply run the inverter into the doll house wall socket by using a male-to-male extension cord and let the house use what it will, saving her from the dreaded high energy bills of a post-2012 doll world. Is Julie's thinking correct at least in theory? If not, why not?