GRAVITY DRAINAGE SUBSYSTEM FOR REDOX FLOW BATTERY SYSTEM

Systems and methods are provided for a redox flow battery system. In one example, the redox flow battery system includes an electrolyte sump tank positioned below cell stacks of the redox flow battery system. The electrolyte sump tank may be configured to receive electrolyte from the cell stacks during operation of the redox flow battery system in a stand-by mode. The redox flow battery system may further include three-way valves arranged in a flow path of the electrolyte between the cell stacks and the electrolyte sump tank to control a flow of the electrolyte to the electrolyte sump tank.