SOLAR CHARGER SHIELD V2.2 with Arduino Shield is a shield from Seeed Studio that makes it easy to power and charge small electronics projects using just the sun. This shield includes a MPPT (maximum power point tracking) which helps track the amount of electrical energy from the solar panel and a LiPo battery charger and USB micro port that allow you to charge the battery without manual intervention. The board also offers a variety of GPIO pin strips, pin headers, and jumpers that make it easy to connect a wide range of devices and peripherals. This shield is an excellent choice for quickly and easily powering up small outdoor electronics projects, with over-voltage, over-current, short-circuit, and reverse-voltage protection as well as temperature and light sensing capabilities.