I'd like to have a light in my coop and will also need to keep my water from freezing this winter. The coop is far enough away from my house that I'd like to use solar power. Found this on Amazon - is it a good start? Sunforce 50044 60-Watt Solar Charging Kit Obviously I'll need a battery or two to go with it. And an inverter. What would I put downstream of that? I only want it to come on at night. So the optical switch (i.e. "electric eye") should be between the batteries and the inverter, right? Do they even make these in 12 volt? Any suggestions, pics, drawing, etc. from anyone who has done this would be appreciated!