I placed a leonardo board in the garden, powered by a 6Volt (maximum 9 volt) small solar panel, with a 4 farad super capacitor. First I used the blink sketch on pin 13, but soon found the sun did not allow me to see the led. Then I put a buzzer on pin 9, same sketch just pins changed. As the clouds moved in and out, it worked, and stopped, then worked again. I see no problem, as long as there is power, this one will start back up, and run fine.
You think if I let it set over night, the results will be any different? I will try it tho.