Product & Technology
Repowering refers to the process in which used electric vehicle batteries are technically refurbished, tested and, if necessary, repaired in order to make them fit for a second use as stationary energy storage devices. This involves replacing individual cells or modules, comprehensively testing their safety and performance and recalibrating the batteries. This gives the batteries a second life - more sustainably, resource-efficiently and cost-effectively.
Second life batteries are batteries that have reached the end of their ‘first life’, e.g. in the mobility sector. Typically, this happens when they can only provide 80% of their original capacity. For stationary applications as electricity storage, however, these batteries can still be used for a long time - and thus offer added value in their ‘second life’.
STABL Energy makes this profitable for the first time, as the second-life batteries do not have to be elaborately reconditioned and harmonised with each other as was previously the case. Our modular system architecture makes it possible to connect batteries in different states.
Normal battery inverters switch the high voltage of the storage battery on and off for different lengths of time. This process is called pulse width modulation. The resulting voltage must be smoothed by a so-called mains filter so that it complies with the standards and requirements of the power grid. This costs efficiency and causes losses.
In science, STABL Energy's approach is referred to as a ‘modular multilevel inverter’ and is widely used in high-voltage direct current transmission. STABL Energy was the first company to optimise it for stationary battery storage systems. Here, the sine wave voltage is simulated by connecting the individual battery modules in series one after the other. The step voltage generated in this way is much more similar to the desired grid voltage than that of conventional inverters. This means that the mains filter can be smaller and losses are minimised.
A battery storage system can be used in a wide range of applications, such as increasing self-consumption and peak load capping. Intelligent energy storage helps companies to reduce their energy costs, ensure greater energy supply security, earn money and do good for the environment.
An inverter is a device that converts direct current into alternating current and vice versa.
A battery itself can only supply direct current. This results from a direct voltage between the positive and negative poles. Thanks to Nikola Tesla, however, the electricity grid is based on alternating current or alternating voltage, i.e. a current that changes direction at a certain frequency (50 Hz in Europe).
The aim of every inverter is therefore to generate a grid-compliant sinusoidal voltage from the battery's DC voltage and vice versa. Basically, an inverter is comparable to the power supply unit for a smartphone, with the difference that the battery inverter can also feed energy from the battery into the grid.
What battery storage solutions does STABL offer and for whom? STABL Energy has developed a modular inverter technology that replaces the conventional central inverter. The modular multilevel inverter is suitable for stationary commercial and industrial storage systems.
STABL Energy offers complete battery storage solutions for commercial and industrial applications. Our storage systems are made from automotive batteries, combining battery quality from the automotive industry with technical innovation from top German universities.
We are currently only developing our solution for medium and larger commercial applications and large storage systems. Therefore STABL inverters can NOT be used for home storage applications.
About us
STABL Energy emerged from research projects at the Technical University of Munich, the University of the Federal Armed Forces in Munich and Osnabrück University of Applied Sciences. The company was founded in January 2019 as m-Bee GmbH and was renamed STABL Energy in July 2020. STABL Energy hired its first employee in spring 2020 and has since grown steadily to 14 permanent and 13 part-time employees.
After initial financing through the EXIST programme of the Federal Ministry of Economics and Culture, STABL Energy was able to finance itself through several rounds of investment and funding.
The founders of STABL Energy already knew each other from their student days. Arthur and Martin were involved in the initial underlying research project, Nam and Arthur have known each other since the first day of their electrical engineering studies and Christoph worked together with Nam in a student consultancy. These long-lasting friendships laid the foundation for a joint venture and form the basis of the corporate culture at STABL Energy.
We are paving the way for a net-zero energy system with safe, reliable and sustainable battery storage systems.
STABL Energy strives for sustainable energy utilisation with its inverter technology. Our goal is to increase the use of renewable energy with the help of energy storage systems. We are doing this by setting a new standard for battery storage. With our easy-to-integrate technology, we improve the design, safety, reliability, cost efficiency and handling of battery storage systems.
Our inverters also enable the seamless and simple integration of used vehicle batteries, thereby reducing the resource consumption of energy storage systems and extending their service life. In this way, STABL Energy enables the most favourable and sustainable battery storage systems.
How do you pronounce STABL? STABL is pronounced like the English word ‘stable’.
[ˈsteɪbl̩]
