Im skimming through all the info on solar and need a little help. I want a heated water dish plus and maybe a light to promote egg laying once they start. They were born at the end of June. What amount of power do I need for those items (using a low-power bulb) Can I use a 15 to 20 watt panel in one of the kits? I assume I need an inverter so I can plug in the heated water dish. I would use a battery for the cloudy days. I Live near cape cod MA.