This is a multifunctional off grid solar inverter, integrated with a MPPT solar charge controller, a high frequency pure sine wave inverter and a UPS function module in one machine , which is perfect for off grid back up power and self-consumption applications. The wifi /GPRS module is a plug-and-play monitoring device to be installed on the inverter.With this device , users can monitor the status of the PV system from phone or from the website anywhere.