I dry camp about 3 to 4 times per year for 2 to 4 days max. I have a small pup with minimal energy usage. Usually I run LED ceiling lights a few hours, charge a phone and if hubby comes along his MacBook Pro. I would like to get a small solar panel unit. I was thinking 40 to 50 watts. Fellow dry campers in town thought I could get by with smaller units, but I do not know. They recommended a portable unit, with a stand to angle towards the sun rather than mounting to the roof. We have sun about 295 days per year. They recommended a small unit from harbor Freight, but I am not seeing much there right now. What would you suggest? Any good deals around? Thanks! Oh I have a heater, but only run it when the temp drops below 20. I would not expect the solar pane to keep up with that type of usage.