Seeed solar charger shield for arduino boards v2 2 seeed studio 106990020 p the energy shield from seeed studio is a highly adaptable power system capable of accepting power from solar cells and via micro usb your li ion battery will provide power up to 600ma when no other supply is connected and it will be charged when external power is available fitted with an on off switch this is a must for your next arduino portable or off grid project p p seeed provide technical documentation