Those little solar flowers that flap their leaves and bob back and forth are the best solar devices known in keeping investors as close to payback as they will ever get. You can get them at The Dollar Store.
Great replies. Sound advice in setting up a wind collection unit as well. There are some great ideas to do this on you tube. Put a little more money into additional batteries and series them together. Also, excellent advice about having a motorized backup as well. One of the keys is banking enough energy to use when the SHTF