We already have an electric fence set up in our field but the battery keeps dying and it is a real pain. I want to use a solar panel to charge the 12V car battery that is the power source for our fence. I know nothing about solar panels besides the fact that they are direct current. What would I need to buy to charge the fence with solar panels? Could I just buy a solar panel and hook it up (however you do that) to our car battery that is connected to the fence charger or do I need to buy the whole set up for a solar powered electric fence? I don't want to over charge the battery- what size solar panel would I need to safely charge the battery and do I need a charge controller (whatever that is)? I've tried researching online, but all I keep getting is adds for the complete solar powered electric fence set up. Any help would be appretiated thanks.