Anyone have any advise about the mighty mule gate openers. I have a 12 ft. gate about 175 ft. from the house, and they look to be the cheapest. Thinking about solar panel to power the battery and what not. Do I have to buy a panel from M.M. or will any 5-10 watt work. What about a battery, gel, lawn mower, deep cycle and from what I understand some will fit in the box where the board is stored. Another question, what is the appoximate price of these add ons or needed to operate the opener?