One thing I would have added was a diode to each battery, this way if one of th cells shorts out, you will be able to keep the rest of the energy stored, and the failed cell will not drain the good cells. Another thing you ca do is build an "Earth Battery" using copper tubing and EMT electrical tubing, sawed into short pieces 6 inches to a foot in length. drive these into the ground and pour salty water around them, and they will produce free energy, enough to operate your LED lighting, and they are portable, like your yurt. If your yurt uses tent stakes, replace them with the copper and EMT tubing and reuse the piping and wiring when you move your yurt.