Smart Design: Made mainly using an aluminum alloy shell for durability and cooling. 4-in-1 Functionality: It comes with 4 functions, such as a 20-amp battery charger, an inverter, a UPS, and a USB port for one unit, which perform more functions at once in one unit. Solar and Grid Compatibility: When the battery charge is low, it is capable of connecting to grid power automatically, as well as during the day to connect to the solar panel to charge appliances