VRFB energy storage station (ESS) is a comprehensive-integration of cell stack, electrolyte, pumping system, battery management system (BMS), energy management system (EMS), thermal control system and other auxiliary systems. At nominal rated power, VRFB energy storage station can discharge from four to ten hours or even longer. The discharging duration can be adjusted by controlling the electrolyte capacity. A higher operation power than the nominal rated power is possible for quick charging or discharging.