This is a multi-functional off grid solar inverter, integrated with a MPPT (120VDC ~ 430VDC) solar charge controller, a high frequency pure sine wave inverter with a UPS function module all in one machine. This unit is perfect for off grid backup power and self-consumption applications. It can work with or without batteries. The Wi-Fi / GPRS module is a plug-and-play monitoring device to be installed on the inverter.