It really comes down to a couple things: How much you want to set up when you get on site.....and how much you want to take down when you leave. The other thing is what you want, or can do with out. We don't have a single 120v appliance or 120v need. We are able to accomplish everthing in our trailer that we do at home, it's just that we use 12v and propane......or a campfire. So my 4-6v batteries and 450w of well thought out solar, fixed to the roof, cares for all our needs and I have no suitcase panels to pick up and store when I leave. Cool thing is everone can have their own set up taylored to their needs and be happy with it.