I have asked myself the same question and I think the answer really depends on what you camp in, where you camp and your energy needs. Some on here camp in 5 wheels and trailers that don't come with gensets some in class A's with built in gensets. Some like to stay in one site for a week or more some like to travel and see the country every several days or so. For example I have minimal energy needs, water pump, refer controls and a few lights and 230 AH batteries. In 14 years and 80k miles of travel I have never used my genset just to charge my batteries and I dry camp 95% of the time but I never stay in the same spot for more than a week at a time. I travel more than stay for weeks in the same spot. After 7 days I am out of fresh water and my batteries are 50% SOC so I need to drive to another spot anyway to dump and fill and my wife needs to do laundry. I have to look for ways just to exercise my generator but my generator has more hrs just running at home under load.