In the last 15 years, the increase in renewable energy sources such as photovoltaic and wind energy has accelerated significantly. Simultaneously, manufacturing and installation costs, especially for PV systems, have fallen considerably, making this energy source one of the cheapest and cleanest forms of energy, depending on the location. With the increase of fluctuating renewable energies in an electrical grid, the need for compensation possibilities at times when renewable energies are not available increases. One possibility is the use of electrochemical energy storage such as Redox-flow batteries.

VoltStorage develops and produces solar power storage systems based on the ecological Vanadium Redox Flow (VRF) technology in order to store surplus solar power during the day to make it available at night. The VoltStorage Series 100 battery, with 3.6 kilowatts and 6.8 kilowatt-hours of capacity, is offered at a competitive price that includes sales tax. The firm claims its 220-litre, made-in-Germany Vanadium redox flow battery is the safest and cleanest home energy storage solution in the market.

With its sustainable storage solutions, VoltStorage follow the vision of making 100% renewable energies available 24/7 – and thus making the world cleaner and fairer for future generations. Interestingly, the Munich-based firm is the first company to make the Redox Flow Technology—which has been successful in the large storage segment for years—available as a home storage solution for private households. This was made possible by a patent-pending production process that allows an automated and thus cost-effective production of Redox Flow batteries for the first time. With the VRF technology, VoltStorage can establish a storage technology in the mass market that is free from rare earth and conflict materials, completely recyclable and has a high level of operational durability without capacity losses.
VRF technology differs from lithium storage technology as it is safer and more durable and allows more ecological and resource-saving storage of electrical energy.

Vanadium is the 20th most abundant element in the earth's crust, and VoltStorage's iron Redox-flow battery is an easier-to-source material. Also, VoltStorage touts Vanadium's environment-friendly credentials compared to other batteries, citing the toxicity of lead in lead-acid batteries and concerns about the impact of lithium-ion cells on the environment. VoltStorage also claims an economic advantage based on a longer battery lifespan. According to VoltStorage, its batteries could go through more than 10,000 cycles with no degradation. Based on a full charge and discharge in each process, other batteries can deliver 43,200 kilowatt-hours over their lifetime. With its significantly higher cycling capacity, the VoltStorage battery could over time provide 68,000 kilowatt-hours, bringing the per-kilowatt-hour cost down to a minimum.

VoltStorage GmbH was founded in 2016 by Jakob Bitner (CEO), Michael Peither (CTO) and Felix Kiefl (CPO). Together with an international Redox Flow, IT, electronics and engineering team, the first VRF home battery solution (VoltStorage SMART) was launched in 2018. The company's energy storage systems—founded in 2016—are developed and manufactured in Germany and offer high product quality "Made in Germany". Thanks to resource-saving Redox Flow battery technology, the production of VoltStorage energy storage systems produces up to 37 per cent less CO2 than comparable lithium-based systems. This makes the battery systems of the Munich-based company one of the most climate-friendly energy storage solutions available on the market.