Under what circumstances would one expect that plugging into a regular 110v outlet wouldn't work? I plug my S into the one next to my parking space at work all the time with no problem, but there's an official green-car-spaces 110v plug in a parking deck across campus and it will not work there (both the UMC and the car flash red in all four outlets). I'd think it was simply defective, but the leafs that park there charge just fine (and, BTW, because I can't charge, I can't park there).