redT – Industrial Scale Energy Storage
redT’s vanadium flow machine energy storage systems are perfectly suited to use in large scale, long duration applications in both grid connected and off-grid markets.
redT’s Vanadium Redox Flow energy storage machines consist of two primary components, the stack and the electrolyte, which is contained in two tanks. redT’s 5kW stack acts as the engine of the system, whilst the electrolyte acts as the ‘fuel’.
This set-up means that unlike conventional batteries, redT energy storage systems have the ability to size power and energy independently to better suit an application’s requirements.
The redT 60-300 energy storage machine
How does VRFB work?
redT Energy Storage systems use proprietary Vanadium Redox Flow technology to efficiently and sustainably store energy in liquid form. This technology relies on the ability of Vanadium to exist in four different oxidation states (V2+, V3+, V4+, and V5+), each of which holds a different electrical charge. The electrolyte in the negative half-cell contains V3+ and V2+ ions, whilst the electrolyte in the positive half-cell contains V4+ and V5+ ions.
This technology utilises the flow of this vanadium electrolyte, separated by an ion exchange membrane. A reversible electrochemical reaction allows electrical energy to be stored and subsequently returned. The setup of the electrolyte and the membrane stack can be compared to that of an engine and fuel tanks. The membrane stack (‘engine’) delivers power rated in kilowatts (kW), whilst the fuel (the vanadium electrolyte) delivers energy rated in kilowatt hours (kWh).