eSolar 4G module is an easy-installed and quick commissioning communication module in inverters' monitoring and maintaining PV system. It realizes faster wireless communication speed with LTE CAT4 up to 150Mbps for downlink and 50Mbps for transferring uplink data. In condition without internet, Bluetooth of this module can be applied to monitor the data of inverter at any time desired. Safety settings can be configurated via eSolar Portal.