Since I moved from a tent to a trailer, I did my best to put together a trailer that would allow for long term dry camping. I have all LED lighting, a 95 watt solar panel, and a pair of 232 amp/hr 6V batteries. In addition, I have a furnace that draws 1.8 amps.
I also use a fair amount of electricity to power a cell phone amplifier, 12V router, a power hungry laptop, and a bunch of battery chargers, as well as making a pot of coffee each morning that eats around 10 amp/hrs.
With that combination I can camp until my tanks are filled (so far the longest is 2 weeks) in partial shade. In full sun my batteries are back to full by noon.
If you are in heavy shade, but there is open space nearby, there are a number of "Suitcase" solar charging systems available in the 60 - 150 watt panel size.
