VisBlue - Frequently Asked Question





Frequently Asked Questions Area

The purpose of this Frequently Asked Questions (FAQ) area is to help you to learn more about the
VisBlue Battery Solution. Please explore the various categories here and if you can't find the answer to your question and you'd like us to look into it, please contact us.

  • What Are the Technical Specifications of a VisBlue Battery Solution?

    The VisBlue Battery is based on an all Vanadium Redox Flow Battery (VRFB), which is the most mature Redox Flow Battery technology.


    Electricity is stored electrochemically by changing the oxidation states of Vanadium Redox species that are dissolved in sulphuric acid and stored in two separate tanks. While charging or discharging, the two solutions are circulated through a flow cell, where the electrochemical energy is converted into electricity or vice versa.


    The basic chemical principles used in Redox Flow Batteries are similar to that of Li-ion Batteries or Lead-acid Batteries, where electricity is stored in solid redox electrolytes. In Redox Flow Batteries, liquid redox species are used. Moreover, Redox Flow Batteries can be described as reversible fuel cells with fuels/electrolytes other than O2 and H2. Redox Flow Batteries have high (70-90 %) cyclic charge/discharge energy efficiencies, depending on the charge/discharge current. One of the attractive features of Redox Flow Batteries is scalability between storage capacity and power because the storage tank and power generation are two separate units.


    Compared to Redox Flow Batteries, based on redox species other than vanadium, the Vanadium Redox Flow Batteries have the advantage that cross contamination of ions inside the flow cell is less detrimental than in mixed species batteries and will only result in slow self-discharge. This means that, VRFBs, in principle, have an infinite lifetime. However, mechanical deterioration of the flow cell gives finite lifetime. Depending on the quality of the flow cell, the lifetime is expected to be at least 10-15 years (>3500-5500 cycles). At the same time, the vanadium species that constitutes about 30-50 % of the battery cost has significant scrap value and can be reused in a new installation. Such lifetimes are significantly higher than that of a standard Li-ion and Lead-acid Batteries (< 3000 cycles and <1000 cycles respectively), which together with the low cost of the Vanadium Redox species is the main reason for the lower cost of storage in Vanadium Redox Flow Batteries.


  • What Is the Cost of a VisBlue Battery Solution?


    Each requirement for energy storage is different and the solution is therefore tailored to
    the particular client. We are happy to discuss individual requirements to see if we have a solution
    that is appropriate for you.


  • Is the VisBlue Battery Solution Scalable?

    Yes. We can design and deploy systems using as many VisBlue units as you need for your home or office.

    All our solutions start with a specific calculation of the customer’s needs and expectations. The fact that we can scale our solutions, so the customer gets the optimum solution from the word go, is one of VisBlue’s great strengths. Our calculations are carried out using advanced simulation software, which we

    have developed for the purpose.

  • Is It Environmentally Sound to Use Vanadium?

    Vanadium is a metal that can be found in more than 100 different minerals. Vanadium, as used
    in the VisBlue Battery as vanadium electrolyte, is anticipated to have a long life span of up to 20 years in
    each battery system. If a battery system is de-commissioned for any reason, the vanadium solution
    and all the contained metal can be 100% reclaimed and re-used elsewhere.

  • Is Vanadium Recyclable?

    Yes. The batteries have a lifetime of 20+ years. The electrolyte can be removed after this time, cleaned by filtration if necessary and re-used.



  • What Is the Lifetime of a VisBlue Battery Solution?

    The batteries have a lifetime of 20+ years.


    Vanadium-based flow energy storage systems can operate forever. The active ingredient - Vanadium - is a rechargeable electrolyte, which never wears out due to the type of chemical reaction involved. The electronics and software to manage the system can be easily upgraded like any computer. The last major component — the plastic tanks that hold the electrolyte — lasts for decades.


  • Is the VisBlue Battery Solution Recyclable?

    Yes. More than 95% of all the components in a VisBlue Battery can be recycled. VisBlue's core battery module has major components that are either recyclable or reusable.


    As our battery has separate major operating components (tanks, electrolyte, pumps, electrode stack), these components are easy to remove and recycle in separate ways.


    The tanks and the electrolyte stack (the heart of the battery system) are made of conventional plastic.


    The stack is held within two large metal plates that are easy to recycle.


  • What Are the Benefits of a VisBlue Battery Solution?

    Large savings

    Our solution provides savings from day one. The customer utilises a much higher proportion of the free solar energy and thus has to buy less electricity.


    Scalable to suit individual requirements

    Whatever the requirement, we can adapt the solution to the precise capacity needed by the customer. It should pay off to be environmentally conscious.


    Long lifetime

    The battery can be charged far more times than either lead or lithium-ion batteries – around 10,000 times – and without affecting capacity either.


    An eco-friendly solution

    VisBlue makes the world greener. We boost the utilisation rate of solar power and make our batteries from recyclable materials. With security against tariff changes, VisBlue’s customers buy less electricity and are, therefore, less vulnerable to political measures and changes in the export tariff for surplus electricity.


    An asset when selling

    VisBlue looks good in energy accounts and will help make your home more attractive when the time comes to sell it.


  • Where Is VisBlue Located?

    VisBlue’s main office is located in Aarhus, Denmark, where we also have our production and development facilities. In Aarhus, VisBlue has close connections to the University of Aarhus, in order for us to continuously improve the chemical solution, the membrane and the bipolar plates.


    Furthermore, VisBlue has a small office in Porto, Portugal, supporting the R&D and Business Development of VisBlue. With the office in Porto VisBlue has a close relationship with the University of Porto.

     Click here to find us

Join our mailing list

Sign up

Press contact

VisBlue strives to keep a good dialogue with the press and appreciates quick responses to enquiries. Enquiries from the press should be addressed to CEO Søren Bødker.



P: (+45)  71 996 996



Subscribe to the VisBlue mailing
list for all the latest company news
and product updates.

P: (+45)  71 996 996

Bautavej 1A

8210 Aarhus V



CVR: 36427957

©2018 VisBlue





Subscribe to the VisBlue mailing list for all the latest company news and product updates.