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Hi great idea and perfect timing as my two daughters have just built a cubby house and want to put in some lights. I was thinking of doing something with Solar. So will follow your projects. If you are looking for ideas;
1)Simple charging circuit during the day to a battery then having LED lights at night with a motion sensor to turn off or on. Which I can see you have already designed, but not sure what the calculation is for number of lights for a given battery solar cell combination.
2) Then advance to potentially tracking the solar cell towards the sun via simple stepper motor?