Probably 3-4 days max, long weekend with friends comes to mind. If the batteries run low and the solar is not sufficient, I can always run the van as I will have a dedicated alternator for the house system. I have a tendency to overdo things, I would rather go that way than shortchange myself. Since I have a 3500 XD, I am not too concerned about the weight of an additional battery, but if I was on a 2500 and was closer to max weight, I might change my tune.I have an idea that if you have 100Ah of battery, that it will run most any system. I am thinking it is how long are you going to be setting in camp is the question?