Gridbox is a device to prevent the electric energy from photovoltaic system from feeding into the public grid. It connects with the inverter through RS-485, uploads the data to the cloud server through wireless networks such as Wi-Fi, GPRS, 4G, etc. it can monitor the data of power generation, power consumption, power purchase in real time, support remote monitoring, set parameters and other operations, so as to ensure the power supply quality and security of the public power grid.