My son has 2003 Nissan Xterra. He asked me about putting Christmas lights on his roof rack. I told him maybe next year, as it was too late to get the stuff for this past Christmas. Do you simply buy an inverter plug it in the cigarette lighter and wrap the roof rack? Does a string of 300 mini bulbs use much power? Would this put a strain on the alternator? Does the inverter matter? Any advice would be really appreciated.