Yes, the box is more for weather/rain protection than heat. The best thing you can do for heat(or cold) is to run the wires from the solar panel into the house and connect all your electronics there. If that is not feasible then place some sort of cover above the box to keep it out of direct sunlight.
I don't know if there is a direct kit that would work for you. But if you are using a 7 watt bulb lets say for 10 hours a night then that would be a minimum of 70 watt hours per day. I would increase the battery capacity to at least 200 watt hours. You could probably get by with using two 12 volt 10 amp hour AGM batteries wired in parallel. You could use a 50 watt solar panel for charging. You have to be sure the panel is located so that it can get full sun for at least four hours per day even in the winter. JJ
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