VRFBs store energy by employing vanadium redox (oxidation state) couples, V2+/V3+ in the negative, and V4+/V5+ in the positive half-cells. Vanadium redox couple is chemically active; it gets dissolved in sulfur acid electrolyte solution. The energy and power rating of VRFB are independent of each other. This is a significant feature of VRFB to modulate power in kilowatts (kW) and energy in kilo watt hour (kWh). The power of the VRFB is defined by the size and number of cells in a unit, while the energy capacity is set by the amount of electrolyte stored in the reservoir. The half cells of VRFB are connected to the electrolyte storage tanks, which can essentially pump large amounts of electrolytes for better performance in storage of power especially for solar and wind power generation plants . . .

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