Found a great post about Solar-Powered Arduino Board and going to test it myself.
Schematics:
Components we need:
- Arduino Duemilanove
- 12V solar panel
- 1N4007 Diode
- 25V 100uF Capacitor
- 9V Rechargeable Battery
- A breadboard and some wires
- A multimeter
Arduino’s recommended input voltage is 7 – 12V (limits 6 -20V) so 9V battery fits well. All we have to do is to recharge battery using solar panel and link the Arduino board to the circuit.