No you really do not need a generator for a couple of days. We usually spend three or more days at a time on the Metolious with no hookups just fine. About three years ago we were there over Memorial day weekend, cloudy, cool and some rain. So lights , tv and heat were pretty much on all the time and my batteries were fine. I did run the generator for a couple of hours on the last day just to be sure. If you decide on a generator, start with something like a Honda 2000? That is a good handy tool. Easy to carry and store and will produce enough power to recharge the batteries.