This is a multifunctional off grid solar inverter, integrated with a MPPT solar charge controller, a low frequency pure sine wave inverter and a UPS function module in one machine, which is perfect for off grid backup power and self-consumption applications. This inverter can work with or without batteries. The whole system also need other devices to achieve complete running such as PV modules, generator, or utility grid. 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 the mobile phone or from the website anytime anywhere.