VSUN Energy utilises the vanadium redox flow battery (VRFB) to create a reliable, safe and stable solution for the storage of renewable energy.

VRFBs offer long duration energy storage with the ability to provide smooth power delivery over 4+ hours.

  • Absolute scalability
  • Lifespan of 20 years
  • Immediate energy release
  • Excellent charge retention - up to 1 year
  • Suitability for grid connection
  • Ability to discharge 100% with no damage or loss
  • Multiple cycling - thousands of cycles!
  • Inherent safety - non-flammable and non-explosive
  • Uses only one element in electrolyte; V₂O₅

VRFB employ vanadium ions in different oxidation states to store chemical potential energy.

To make the batteries, vanadium pentoxide (V₂O₅) as a raw source is processed into an electrolyte (solution).

The battery’s storage capacity can be expanded simply by adding more electrolyte to the storage tanks, which hold the electrical charge for later use. They can also be left completely discharged for long periods with no ill effects.

The battery can be charged and discharged at the same time, and has the additional ability to cycle often and deeply, differentiating it from its solid state (Li) based cousins.

How a Vanadium Redox Battery Works - Diagram

The liquid energy sources are stored in two tanks and pumped through the electro-chemical cells. Depending on the applied voltage, the energy sources are charged or discharged electro-chemically.

The charge controller and inverter represent the interface to the electrical energy source and the user respectively.