I would think what you are trying to do would work but i would think about going about it a little different way. most generators with a 12v output are not made for a lot of amperage across the 12v. i would think about getting a 12v converter that you could plug into the 120v side of the generator and then hook your lights to the converter...that way you wouldnt have to worry about burning up your generator 12v and you would be good to go for as many lights as the converter could handle. also most of the converters have either a fuse or a curcit breaker in them for overload protection.