Experimental analysis of the electrical efficiency of a new 15 kW vanadium flow battery under varying operating conditions

Experimental measurements of the efficiency of a new vanadium flow battery with a nominal/peak power of 10/15 kW and a capacity of 27 kWh under various operating conditions has been carried out at the Electrochemical Energy Storage and Conversion Lab (EESCoLab). The experimental tests focus on analyzing efficiency across different State of Charge (SoC), employing different currents, i.e. I = 100 A and 150 A, along with different flow rate management strategies as: constant flow rate, constant flow factor, and optimized flow factor. Additionally, the system efficiency is assessed during constant current and constant voltage (CC+CV) charging profiles. The experimental results of this analysis aim to enhance the understanding of vanadium flow battery performance in real conditions, with significant implications for their application in large-scale energy storage systems for stationary applications.