Energy Storage

At the vanguard of an energy revolution.

Imagine how practical would it be to store up unused power until we really need it, or from solar panels when the sun is not shining. And imagine charging your electric car at the times when electricity’s cheapest, from your own supply to bypass power peaks. These are not the dreams of a distant future, but can now become a reality. Our Energy Storage Systems are driving a new energy revolution, a smart technology which helps avoid performance peaks where multiple machines are simultaneously feeding off the grid. Best of all, the core of our ESS comes from upcycled car batteries.

Smart Energy Storage with Lithium Technology

For all those frustrated by spiraling energy costs, we have good news for you: a system which gets around power peaks. It may sound like magic, but is merely highly sophisticated technology. We have developed an Energy Storage System based on buffer batteries with corresponding inverters (67.5 kVA). Depending on their use cases they can be fully automatically operated, or extra energy from the ESS can be deployed elsewhere, such as for machine boot commands. The fluctuations in energy supply are familiar to all, such as solar panels producing excess energy in summer but too little in the winter, and huge disparities between electricity costs in the morning and evening. In order to save electricity and optimize power distribution, our Energy Storage Systems overcome such issues. They support grid connection whenever necessary and facilitate the dream of a wholly new circular economy.

Our USP: ESS with Second-Life Batteries

It is a deceptively simple concept: offering as much capacity as possible, as sustainably as possible. For us, it was clear that this should include using second-life batteries for our Energy Storage Systems, such as car batteries. With this environmentally friendly storage, it is up to you when and for what you use your energy. The Energy Storage Systems provide you with sustainable energy reserves even at peak times.
  • The safe cell technology
  • Very low costs per stored kilowatt hour
  • Requires very little servicing or maintenance
    (< 1% of cases)
  • 100% supply reliability in operation
  • 5% more usable capacity
  • Ready-made for all voltages worldwide

Energy Storage and Management in 19” server-racks

Through smart power storage, you can have your own energy reserves to call upon and reduce electricity supply costs. Our Energy Storage Systems use innovative lithium-ion technology with minimal losses. Suitable applications can be connected to PV modules without the need for additional inverters, to store energy for later use. Installation of our ESS is quick and efficient, avoiding the costly expansion of grid networks. It can be combined equally with solar arrays, wind turbines, fuel cells, or hydropower. Depending on size, our staff can install external powerhouses or rows of cabinets in only short time.

The Potential of Energy Storage Systems

Car batteries need not be disposed of after their use - they are in fact the perfect candidate for a high-performing Energy Storage System. In this way we give them a new lease of life and put forward a viable new storage solution for industry, manufacturing, renewables, and household use.

Our ESS enables peak shaving at the start-up of devices, UPS-functionality for IT infrastructure or emergency lighting. In combination with various other systems these units can also be used for FCR (50 Hz frequency containment reserve) and congestion management. Remote control and monitoring are integrated in the Energy Storage System, and service and maintenance are straightforward yet rarely required.

Our Competitive Advantages

A self-sufficient
energy supply


Regardless of use, your own electricity supply is available for optimizing your consumption or for emergency supply.

Kicks in during
power peaks


The Energy Storage System recognizes power peaks and supplies the connection with additional energy from its own storage. This relieves the load on the grid connection and reduces your electricity bill.

Stores electricity
from renewable sources


With the ESS it is possible to easily store green energy, by connecting with solar or wind facilities.

Supply in case
of power cuts


Our Storage Systems can keep machines and devices running even in the face of power cuts. The ESS utilizes its stored energy, thus keeping up power supply.

The lithium-ion Battery Storage System (Cell Chemistry: NMC) caps peak loads and manages cost effectiveness at every turn. It’s a combined storage and management system, specially developed to lower your energy costs via high-performing peak shaving technology. Thanks to its universal design, the Battery Storage System can be seamlessly integrated into existing installations.

Areas of application

  • Industry and manufacturing
  • Electromobility
  • Building sites
    or mining
  • Telecommunications
  • Quarter storage

Our services

  • Peak Shaving
  • Intelligent
    charge management
  • Second-life use
    of car batteries
  • Accumulation of own energy storage
  • Integration of renewable energies
    (wind, solar, hydro)

Built-in Energy Management System

A 19-inch Battery Management Unit (BMU) can be integrated into the same container that controls all batteries in that rack. The BMU communicates with external devices via CAN or the e.battery systems Energy Management System, which also controls the converter in ESS applications.

Analysis and Protocols

Instant analysis is made possible thanks to internet connectivity; important information, protocols and more can be easily checked online.

Energy Storage Systems defined

Energy Storage Systems (ESS) are core technologies in which we have combined our highly intelligent battery technologies to enable unprecedented energy storage. Specifically, we are talking here about a whole range of systems for the widest possible scope of application. Whether for solar, wind or hydro renewable sources, all our Energy Storage Systems share a common goal: storing energy, smoothing out peaks, and saving power. Best of all: these Energy Storage Systems can be swiftly adapted to customer needs, down to the smallest detail. As well as battery development, we also work with the most innovative energy storage technologies. We help you improve efficiency, recognize your energy densities, and extend overall battery lifespan. Our storage systems are developed custom-made, and can be modularly extended.

How we develop customized Energy Storage solutions


We deep dive into the specifics of your company’s peak demands. This becomes the basis for developing a tailor-made battery storage solution.


We give you a first impression of the technological possibilities through which you can store electricity and more efficiently put it to use.


Operational performance and cost optimization begin to take shape; your customized Energy Storage System goes into the final stages of development.


Your Energy Storage System (ESS) is ready and, depending on size, can be deployed by our team within a couple of hours.

High battery voltage
Battery voltage cannot
be switched off.
There is always danger.


100% safe low voltage
Simple and inexpensive
Maintenance and system structure.

The point of failure
A single battery failure will stop
the operation of the entire system.


Autumn operation
Failures limited to module level.
System remains operational.

Expensive waste of energy
Conventional inverters cause
significant energy losses.


70% less energy wasted
More usable energy through unrivaled
energy efficiency of the ebs ready for operation.

Static system
Battery systems can only be exchanged
be upgraded or completely upgraded.


Future-proof technology
Software-defined, modular inverters
enables the storage system to be upgraded
Years after installation.

Energy Storage System: Design

The STABL power inverter is a modular multi-level inverter for battery storage. The technical principle behind it is to dynamically connect the various DC voltage sources (battery modules) in series or bridging. This enables the generation of a step-based sinusoidal voltage, or other voltage forms as required. When turned off, the switches are open so that there is no electrical connection between the battery modules.

Operating principle for the generation
of stepped output voltage


The graphic illustrates the process of generating output voltage with the example of four modules with module voltage of 48 volts. It is modularly designed so that each voltage stage (one or more permanently connected battery modules) receives a performance board of STABL energy via a STABL module. The STABL inverter and the e.battery systems battery module form a grouping – an active module – which is self-contained. The active module has two outputs for the neighboring active module and a further connection used for communication and power supply of the electronics.

Wiring of battery module with STABL
electronics to form an active module:


This diagram illustrates how the battery module and STABL modules are connected.

Each STABL module communicates separately with the battery module, with the STABL acting as master in the communication bus and regularly requesting status as required. Status estimation takes place in the BMS, but charge status can also be implemented in the STABL electronic module as required. The STABL modules serve as a gateway to send the BMS data to the STABL master controller, where it is then considered in the higher-level control. Management takes place via a master controller, which based on the available data determines the dynamic connection of the active modules and sets the respective voltage level at the output.

Comparison of the generated step voltage (this example: 11 steps)
of the STABL inverters and grid sine:


In addition to controlling the active modules, the master controller is also responsible for synchronizing the output voltage with the mains and determines the effective current of the system. The voltage and current measurement on each STABL module and at the inverter output are also integrated. The output measurement by the analog front-end (AFE) board is designed for grid-parallel operation to ensure grid synchronization. This ensures that the AC voltages of the inverter and the mains are synchronous and that the contactors can be safely closed. As with conventional PWM inverters, a large grid filter is required to limit the currents and keep the THD within the permissible range. In comparison, however, the grid filter for the STABL inverter can be of smaller dimensions.

Electrical Wiring of the Battery System:


With a discharge voltage of 40 V, a minimum of nine battery modules are required to ensure a connection to a 230 V grid sine. To test the reliability in the event of a battery module fault, an additional, redundant battery module is required in the affected string so that the remaining battery modules can compensate for the failure. In this case, one battery module is inactive at a time. The respective inactive battery module is changed several times per minute to ensure an even load and an even state of charge of the battery modules. Without a redundant active module, the power is reduced in the case of such a fault and the THD is no longer standard-compliant.