In a large grid-scale energy storage field, BMS, PCS, and EMS operate in different containers, and each container must always maintain data communication to manage charging and discharging in the large-scale power grids. Each container is connected using fiber optic ring topology to enhance network redundancy and ensure the highest stability. By leveraging switches managed by the Advantech EKI-77xx series, each BMS is connected and converts Ethernet signals into fiber optic signals. This way the designer can ensure seamless data exchange between distributed BMS containers. On the top layer of the ring network, the designer uses IEC 61850-3 certified managed EKI-92xx series switches to connect PCS, EMS, and multiple BMS containers. Since security management of the energy storage system is critical, the designer also employs the IMC-370 series media converter to extend the 10/100/1000 Mbps twisted-pair network over fiber technology to connect with surveillance cameras and transfer the video signals back to the network for security monitoring. All of the BESS containers can manage charging and discharging via the IEC 61850 protocol to connect with national power grids through communication using ICR-3200 series 4G/LTE routers, and achieve peak shaving, frequency regulation, and energy management.