The single discharge power of AC125 series energy storage system is 125kW, the discharge time is about 4h, and the energy storage capacity is 500kWh. It can be used in series by adding energy storage units, and is applicable to the energy storage requirements of enterprise production, distributed power stations, and medium and large photovoltaic wind power grids. The AC125 series is designed for stack electrolyte separation. It belongs to different areas in the box. It is characterized by high energy storage, convenient maintenance, high voltage and current, high modularity and low networking cost.