Solutions for the reliable operation of battery storage systems Energy storage systems are becoming increasingly important for the sustainable electrification of the world. Our products and solutions enable you to ensure the reliable operation of such systems.

Container with a print of a battery on a green landscape

In an All Electric Society, in which more and more devices and systems are being operated electrically, battery storage systems are particularly important. They help to keep the power supply stable and reliable by balancing fluctuations in the power grid and using renewable energies such as solar power and wind power more efficiently. Battery storage systems help to reduce carbon emissions and contribute to promoting a sustainable energy future.

A battery energy storage system is modular in design. Important modules include: the battery management system (BMS), the power conversion system (PCS), the climate control system (HVAC), and the power management system (PMS). In addition, other modules are installed that ensure the safe operation of the battery energy storage system. These include, for example, the fire alarm system, auxiliary power supply for lighting, and the DC panel, which takes care of supplying and charging the batteries.

Schematic structure of a utility-scale battery storage system


Utility-scale storage systems with a capacity of several megawatt-hours play a crucial role in grid services. They compensate for fluctuations in the power grid and increase grid stability. In the event of low demand, excess energy is stored and released again in times of peak loads. They also support the integration of renewable energies and improve security of supply. Utility-scale storage systems can be modular or designed as a functional container.

Interactive image map: Structure of a battery storage system
PMS – Power Management System
The PMS is the control center of the battery energy storage system. It controls the energy flows and ensures that everything works together smoothly. Furthermore, the PMS communicates with other systems, such as the BMS and PCS, in order to collect important data and make decisions in real time. The PMS ensures optimum system operation by controlling the power distribution between the batteries, the grid, and the various loads. In industrial battery storage systems, the PMS and HVAC are combined in a central unit.
Example solution for the system availability of a PMS system in utility-scale storage systems
AC panel
The AC panel connects the AC voltage converted in the Power Conversion System (PCS) to a supply network.
Example solution for the system availability of an AC panel
PCS – Power Conversion System
The PCS controls the current flow between the battery and the grid and converts stored direct current from the battery into alternating current for grid usage and vice versa. In industrial battery storage systems, the DC panel, PCS, and AC panel are combined in a central unit.
BMS – Battery Management System
A BMS monitors the state and performance of the batteries. The voltage, current, and temperature of each battery cell are tested and the batteries are protected against overcharging, overheating, and other potential hazards. The BMS contributes to safe and efficient operation and extends the service life of the battery. At the same time, it provides the decisive data for optimizing energy management within the system.
DC panel
The DC panel is used to connect a DC source (e.g., photovoltaic system) to the battery energy storage system.
Fire alarm and firefighting system
The fire alarm and firefighting system forms the protection concept in the BESS, which consists of preventive and defensive fire protection.
Batteries
The battery technology and size determine the capacity and field of application of battery energy storage systems.
Auxiliary systems (heating, HVAC, and fire alarm systems)
In addition to the control and management functions, safety is just as important for battery energy storage systems. Overheated batteries can lead to capacity reductions, fires, and even explosions in extreme cases. To prevent all these risks, HVAC systems are important for maintaining a safe and optimal environment.
Overview of the components for the air conditioning system

Schematic structure of an industrial battery storage system


In contrast to utility-scale storage systems, industrial battery storage solutions meet specific requirements that are tailored to industrial systems. The optimization of energy costs through a load shift or the improvement of energy efficiency in production processes is the main focus here. They differ in terms of structure and the selection of components, and are often smaller than utility-scale storage systems.

Interactive image map: 3D representation of an industrial battery storage system
PCS – Power Conversion System
The power conversion system is more compact in industrial storage systems. AC voltage is converted into DC voltage as well as the supply and feed-in of the battery systems are mostly performed in just one control cabinet.
Schematic structure of the PCS in industrial energy storage units
Batteries / Battery Management System (BMS)
Depending on the capacity, several battery racks are connected and monitored by the BMS.
PMS – Power Management System
The power management system performs several functions in this type of energy storage unit. In addition to the overall distribution of the auxiliary power, the supply of the air conditioning, lighting, video surveillance, etc. is also situated here.
Schematic structure of the PMS in industrial energy storage systems

Solutions for power management systems


PMS in utility-scale storage systems

The PMS is an essential part of an energy storage unit. This is where all the signals from the subsystems come together. Therefore, the requirements on availability are particularly high. All components in the PMS are protected by high-performance surge protection. The controller and communication supplies are backed up with a battery. A UPS ensures operation in the event of a failure in an upstream subsystem or in the AC supply. Device protection prevents failures due to overloads or short circuits. Energy measuring devices are used to monitor the performance data within the PMS.

Interactive image map: Topology of a PMS system in utility-scale storage systems
Lightning and surge protection
The type 1 surge protection protects the power management system against lightning currents and switching overvoltages that can occur via the AC feed-in. We recommend our surge protection with carbon spark gap technology here.
FLT-MB-T1-264/25-3+1-UT-R
Lightning and surge protection
24 V DC power supply
The availability of the PMS is essential for the battery storage system, and the QUINT POWER power supply is the perfect solution for this. The unique SFB technology and preventive function monitoring of the power supply increase the availability of your application. Here, we will show you the solutions from separate modules using the example of a QUINT POWER power supply.
QUINT4-PS/1AC/24DC/10
24 V DC power supply
Battery
The respective dimensioning of the battery determines the potential buffer time until a failure of the 24 V DC supply is rectified or the mains supply is restored. We offer batteries of different technologies and capacities for the various product families. In our example, we recommend a lead battery with 7 Ah.
UPS-BAT/PB/24DC/7AH
Battery
Surge protection for signal interfaces
There are also a number of ways that signal and data lines can be behind a system being paralyzed due to an overvoltage. Therefore, you should also protect all signal and data lines with suitable surge protection. Our recommendation: Protect both the input and output sides with suitable protective devices. In our example, we use the narrow surge protection devices from the TERMITRAB complete series.
TTC-6P-4X1-24-PT-I
Surge protection for signal interfaces
Energy measuring devices
Energy measuring devices help to measure energy consumption precisely in the power management system. By continuously recording parameters such as voltage, current, and power, they help optimize energy efficiency. The precise acquisition of harmonics supports the safeguarding of system functions. The energy measuring devices from the EMpro EEM-MA370 series are ideal for this.
EMpro EEM-MA370
Energy measuring devices
Uninterruptible power supply
The uninterruptible power supply (UPS) ensures that, in the event of a voltage drop, sufficient energy is provided to safely shut down the controller, for example. It immediately takes over the role of power supply from the connected battery. All battery operating parameters are continuously monitored via the integrated communication interface.
QUINT4-UPS/24DC/24DC/10
Uninterruptible power supply
Device protection
It is important to use device circuit breakers to protect the end devices and the power supply against overloads and short circuits. In particular when it comes to protecting several devices, we recommend the CAPAROC circuit breaker system, which creates a high level of system transparency thanks to its communication interfaces.
CAPAROC circuit breaker system
Device protection
EMC filters
To minimize potential electromagnetic interference influences, such as on the transformer, and to optimize the overall performance and reliability of the supply system, we use an EMC filter here.
EMC filters
EMC filters

PMS in industrial storage systems

Industrial battery storage systems and utility-scale storage systems differ in terms of capacity, complexity, and safety requirements. Industrial storage systems are smaller, are for specific applications, and have a simpler PMS. However, both systems must integrate seamlessly into the existing infrastructure.

Interactive image map: Basic circuit diagram of a PMS system in industrial storage systems
Lightning and surge protection
The type 1 surge protection protects the power management system against lightning currents and switching overvoltages that can occur via the AC feed-in. We recommend our plug-in type 1 lightning arresters from the SEC family.
FLT-SEC-P-T1-3S-350/25-FM
Lightning and surge protection
24 V DC power supply
To supply the controller or communication units with voltage, use the QUINT POWER highly functional power supply with a separate UPS module from the QUINT family.
QUINT4-PS/1AC/24DC/10
24 V DC power supply
EMC filters
To minimize potential electromagnetic interference influences, such as on the transformer, and to optimize the overall performance and reliability of the supply system, we use an EMC filter here.
EMC filters
EMC filters
Uninterruptible power supply
The uninterruptible power supply (UPS) ensures that, in the event of a voltage drop, sufficient energy is provided to safely shut down the controller, for example. It immediately takes over the role of power supply from the connected battery. All battery operating parameters are continuously monitored via the integrated communication interface.
QUINT4-UPS/24DC/24DC/10
Uninterruptible power supply
Battery
The respective dimensioning of the battery determines the potential buffer time until a failure of the 24 V DC supply is rectified or the mains supply is restored. We offer batteries of different technologies and capacities for the various product families. In our example, we recommend a lead battery with 7 Ah.
UPS-BAT/PB/24DC/7AH
Battery
Device protection
Circuit breakers are used to prevent devices and the power supply from failure due to overload or short circuits. In particular if you want to protect several devices, we recommend using the CAPAROC system. Thanks to its communication interfaces, this system is able to communicate perfectly with the QUINT POWER power supplies.
CAPAROC circuit breaker system
Device protection
Energy measuring devices
Energy measuring devices help to measure energy consumption precisely in the power management system. By continuously recording parameters such as voltage, current, and power, they help optimize energy efficiency. The precise acquisition of harmonics supports the safeguarding of system functions. The energy measuring devices from the EMpro EEM-MA370 series are ideal for this.
EMpro EEM-MA370
Energy measuring devices
Surge protection for signal interfaces
There are also a number of ways that signal and data lines can be behind a system being paralyzed due to an overvoltage. Therefore, you should protect all signal and data lines with suitable surge protection.
TTC-6P-4X1-24-PT-I
Surge protection for signal interfaces
48 V DC power supply
A 48 V DC power supply provides efficiency, flexibility, and security. It reduces power losses and is versatile, and can be used, for example, for supplying PoE devices such as surveillance cameras and network routers. Our recommendation here is the UNO POWER power supply.
UNO2-PS/1AC/48DC/240W
48 V DC power supply

Solutions for power conversion systems


PCS in an industrial energy storage unit

A PCS converts electrical energy. In this case, direct current (DC) from the batteries is converted to alternating current (AC) for the grid. The process is reversed when charging the batteries. The PCS controls the charging and discharging process, improves grid stability, and increases the efficiency of the energy storage system.

Interactive image map: Topology of a power conversion system in an industrial battery storage system
DC/DC power supply
The highly efficient power electronics for rack mounting enable the cost-effective operation of your battery storage systems. The modular and scalable system is optimized for DC charging with high voltages and currents.
CHARX PS-M2/825DC/1000DC/30KW
DC/DC power supply
Type 3 surge protection
The use of type 3 surge protection ensures that the power supply and downstream components continue to operate reliably and not be damaged even in the event of sudden voltage peaks. This increases the service life of the devices and the entire AC panel.
PLT-SEC-T3-230-FM-PT
Type 3 surge protection
AC/DC power supply
The power electronics for 19" rack mounting enable efficient charging and discharging of battery storage systems. The system is modular, scalable, and optimized for bidirectional power conversion with high voltages and currents. By combining several modules, an output power of up to 960 kW can be reached.
TRIO-HP/3AC/1KDC/20KW/BI
AC/DC power supply
DC surge protection
The VAL-MB-DC surge protection ensures safe operation in grounded, unipolar DC supply systems. The compact design ensures space-saving and flexible installation. In addition, the mechanical-optical status indicator and the remote indication contact ensure that you are always informed about the status of the system.
VAL-MB-T2-750DC-2+V-R
DC surge protection

Solutions for AC panels


AC panel in a utility-scale storage system

The AC panel converts direct current (DC) into alternating current (AC) in a grid utility-scale storage system. In addition, the panel stabilizes the mains voltage and the mains frequency. All energy flows are monitored in the AC panel to ensure that the feed-in and procurement of the energy is recorded and managed efficiently.

Interactive image map: Topology of an AC panel in utility-scale storage systems
Lightning and surge protection
Directly downstream of the transformer, a type 1 lightning arrester protects the AC panel against damage and failures caused by surge voltages. We recommend our plug-in type 1 lightning arrester from the SEC family.
FLT-SEC-P-T1-3S-350/25-FM
Lightning and surge protection
110 V DC power supply
We recommend a single-phase power supply from the QUINT range for the 110 V DC power supply. The QUINT POWER power supply is ideal for supplying loads in the 110 to 125 V DC range.
QUINT4-PS/1AC/110DC/4
110 V DC power supply
Device protection
Circuit breakers are used to prevent devices and the power supply from failure due to overload or short circuits. In particular if you want to protect several devices, we recommend using the CAPAROC system. Thanks to its communication interfaces, this system is able to communicate perfectly with the QUINT POWER power supplies.
CAPAROC circuit breaker system
Device protection
24 V DC power supply
In redundant applications, we recommend using the QUINT POWER Plus versions. Characterized by an integrated decoupling MOSFET, safe surge protection for DC loads, and a large approval package, these power supplies are ideal for demanding applications for redundant connection.
QUINT4-PS/1AC/24DC/10/+
24 V DC power supply
Redundancy modules
Redundancy modules increase the reliability of your system. They decouple the two upstream power supplies in the event of an error and provide a reliable supply of the load in the event of a power supply failure. ACB Technology ensures symmetrical load distribution for both power supplies, thereby increasing the service life expectancy of the supply system.
QUINT4-S-ORING/12-24DC/1x40
Redundancy modules
Surge protection for signal interfaces
Not only can dangerous surge voltages be coupled into the system via the supply lines – there are also a number of ways that signal and data lines can be behind a system being paralyzed due to an overvoltage. Therefore, you should protect all signal and data lines with suitable surge protection. In our example, we use a narrow surge protection device from the TERMITRAB complete series.
TTC-6P-3-HF-F-12DC-PT-I
Surge protection for signal interfaces
Energy measuring devices
If there is a requirement for billable energy measurements, MID-certified energy meters enable the precise acquisition and storage of energy data in the AC panel. For example, you can use our energy meter with MID approval from the EMpro product family.
EEM-EM377
Energy measuring devices
EMC filters
To minimize potential electromagnetic interference influences, such as on the transformer, and to optimize the overall performance and reliability of the supply system, we use an EMC filter here.
EMC filters
EMC filters

Solutions for heating, ventilation, and air conditioning (HVAC)


HVAC in utility-scale storage systems

The HVAC systems (heating, ventilation, air conditioning) in large battery storage systems are essential for controlling the temperature and humidity to ensure optimum operating conditions. They prevent overheating and damage caused by moisture, increase efficiency, and extend the service life of the batteries. Furthermore, they increase safety by reducing the risk of fires and failures.

Interactive image map: Schematic structure of the air conditioning in a large energy storage unit
24 V power supply up to 2.5 kW
We recommend a power supply from the TRIO POWER range for the power supply of the pumps and ventilators in battery storage systems. With its flat design for direct panel mounting, it saves space in your system and provides a flexible solution.
TRIO-PM/1AC/24DC/2500W
24 V power supply up to 2.5 kW
Surge protection for signal interfaces
There are also a number of ways that signal and data lines can be behind a system being paralyzed due to an overvoltage. Therefore, you should protect all signal and data lines with suitable surge protection.
TTC-6P-3-HF-F-12DC-PT-I
Surge protection for signal interfaces
Type 3 surge protection
The use of type 3 surge protection ensures that the power supply, the pumps, and the ventilators continue to operate reliably and are not damaged, even in the event of sudden voltage peaks. This increases the service life of the devices.
PLT-SEC-T3-230-FM-PT
Type 3 surge protection

System availability in battery storage systems


Product overview from the Power Reliability portfolio

Battery energy storage systems are important for compensating electricity fluctuations and for using renewable energy efficiently. They stabilize the power grid and help to manage peak loads.

You can use our products and solutions to ensure that your battery energy storage systems operate reliably and efficiently by making optimum use of the triad of supply, protection, and measurement in almost all modules of your battery storage system. With this approach, you actively contribute to the stabilization of the power grid and the efficient use of renewable energy.