It will work to just reverse the transformer as others have suggested and I also have done before. HOWEVER, i dont recommend putting 110 volts into a 12voltAC reversed transformer and expecting to get a couple thousand volts or a thousand volts out! It will just likely fry the transformer or you will get hurt. If you place 12 volts AC into it ... you will get 110AC out. It will likely not be as efficient. be carefull out there.