For stabilizing voltage in low-voltage grids with recurring overvoltage or undervoltage conditions. Supports distribution grid operation and planning through load-dependent, local voltage regulation to maintain permissible voltage limits.
Typical applications:
- Limiting recurring overvoltages in feeders with high PV feed-in
- Reducing undervoltages at the ends of long grid lines or in load-dominated feeders
- Stabilizing voltage during peak loads caused by EV charging infrastructure or heat pumps
LVRSys® is suitable if:
- Recurring voltage deviations occur that cannot be resolved in the short term by changing the grid configuration
- A local solution is required to keep the voltage within the permissible range
- Reliable voltage regulation is required without major modifications to the affected grid section
- Voltage problems need to be addressed specifically within a particular section of the power grid
LVRSys® - Low Voltage Regulation as an Alternative to Grid Reinforcement
Easy to Install, Flexible and Low-Maintenance
Application Areas
LVRSys®
A. Eberle GmbH & Co. KG
Measure. Regulate. Across All Grids.
A. Eberle GmbH & Co. KG, founded in 1980 and headquartered in Nuremberg, Germany, operates in the field of measurement and regulation technology for the energy sector as well as for medium-sized and large industrial companies. Our products and services ensure and enhance the availability of energy supply across all voltage levels and support the integration of renewable energy sources into power grids.
Low Voltage Regulation
Local Voltage Stabilisation for PV, EV Charging and Heat Pumps
LVRSys® is a low-voltage regulation system for stabilising voltage in grids affected by PV feed-in, EV charging, heat pumps and long feeders. It provides a local and flexible alternative to costly and time-consuming grid reinforcement.
Depending on the grid situation, LVRSys® can regulate an individual feeder or be installed at the local transformer station or secondary substation to support the wider low-voltage grid.
FAQ - Frequently Asked Questions About Low Voltage Regulation
What is low voltage regulation?
Low voltage regulation is the controlled stabilisation of voltage in a low-voltage network. It keeps voltage at customer connection points within the permissible range when feed-in or load conditions change.
When is a low voltage regulator needed?
A low voltage regulator is useful when PV systems, EV charging, heat pumps or long feeders cause recurring overvoltage or undervoltage in specific sections of the low-voltage grid.
How does LVRSys® work?
LVRSys® regulates voltage locally in the affected feeder section. Instead of acting only centrally, it is installed where the voltage problem actually occurs and compensates deviations directly in the grid.
Where can LVRSys® be installed?
LVRSys® can be installed in low-voltage feeders, near critical line sections or at the local transformer station / secondary substation, depending on the grid situation and regulation objective.
What problems can low voltage regulation solve?
Low voltage regulation helps solve local overvoltage, undervoltage, voltage drops in long feeders and voltage deviations caused by decentralised generation or new electrical loads.
Is LVRSys® an alternative to grid expansion?
Yes. In many cases, LVRSys® is a practical and economical alternative when operators need to stabilise voltage quickly without immediately expanding cables or reinforcing the grid.
Which applications are typical for LVRSys®?
Typical applications include residential areas with high PV penetration, feeder sections with EV charging and heat pumps, industrial facilities and rural networks with weak voltage conditions.
What is the benefit for utilities and network operators?
Utilities and network operators gain a flexible way to improve voltage quality, reduce complaint risks, support additional electrification and postpone or minimise expensive grid reinforcement.
News From the Product Group
LVRSys® - News
Training Video
Tutorials: How To Work With »LVRSys®« 7: How LVRSys® compensates voltage drop on the line
6. October 2026
This video explains how LVRSys® can still be used when it cannot be installed directly at the intended point in the grid. By using the impedance functionality, the system can compensate the natural voltage[...]
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Training Video
Tutorials: How To Work With »LVRSys®« 6: Activating the IEC 104 license on LVRSys®
6. October 2026
This video explains how to activate the IEC 104 license on LVRSys®. It shows how the license file is transferred via USB stick, where the licensing menu can be found on the display and how the system[...]
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Training Video
Tutorials: How To Work With »LVRSys®« 5: Visualizing LVRSys® data in WinLVR
6. October 2026
This video explains how to import LVRSys® logbook and service data into the WinLVR software. It shows how to decompress the exported folder, select the correct data, import the file and visualize voltages,[...]
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Training Video
Tutorials: How To Work With »LVRSys®« 4: Downloading LVRSys® logbook and service data
6. October 2026
This video explains how to download logbook files, measurement data, event data and service data from LVRSys®. It shows how to use a FAT32 formatted USB stick, where to start the download in the display[...]
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Training Video
Tutorials: How To Work With »LVRSys®« 3: How to update the firmware on LVRSys®
6. October 2026
This video explains how to perform a firmware update on LVRSys®. It shows which files and USB stick format are needed, why the firmware file should not be stored in a subfolder and how the update is started[...]
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Training Video
Tutorials: How To Work With »LVRSys®« 2: IEC 104 setup for LVRSys® explained
6. October 2026
This video explains how to upload the IEC 104 data point list to LVRSys®. It shows how the parameter file is prepared, which USB stick format is required and where the file can be loaded in the communication[...]
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Training Video
Tutorials: How To Work With »LVRSys®« 1: Setting up Modbus TCP communication with LVRSys®
6. October 2026
This video explains how to parametrize the Modbus TCP connection for LVRSys®. It shows why the SCADA system and LVRSys® should be in the same subnet, how to allow Modbus communication in the firewall[...]
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General Knowledge
LVRSys® vs. Regulated Local Grid Transformer
14. September 2026
LVRSys® and regulated local grid transformers address voltage issues in low-voltage grids from different points in the network. This article compares their control principles, installation locations,[...]
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Blogpost
GRUNDIG AKADEMIE visits A. Eberle
7. August 2026
In 2026, the GRUNDIG AKADEMIE Nuremberg visited A. Eberle with a group of trainee technicians. During the visit, the participants gained an insight into our company, technical fields of work and potential[...]
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Blogpost
A. Eberle named one of the TOP 100 Innovators for 2026
22. July 2026
As part of the 2026 TOP 100 Awards, we had the honour of receiving a special accolade in Heidelberg last week – presented in person by Christian Wulff, former Federal President and mentor of the TOP[...]
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Blogpost
International Partner Week 2026 - Exchange, knowledge transfer and collaboration in Nuremberg
1. June 2026
We were delighted to welcome our international partners to Partner Week 2026. The chance to chat in person, seeing familiar faces and making new acquaintances made the week a special one for us.[...]
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Blogpost
A. Eberle and Bregal Unternehmerkapital enter into a growth partnership
14. April 2026
A. Eberle and Bregal enter into a growth partnership. The partnership with BU is intended to accelerate A. Eberle’s international expansion, innovation and technological advancement.[...]
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Webinar
»LVRSys®« Webinar: The Solution for Voltage Stability Problems - Integrate PV, Electromobility & Heat Pumps
19. March 2026
Webinar recording from 2026-03-19: »LVRSys®The Solution for Voltage Stability Problems - Integrate PV, Electromobility & Heat Pumps[...]
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Special Publication
Low-Voltage Line Voltage Regulators for Stable Low-Voltage Grids | Practical example: »LVRSys®« at »ovag Netz GmbH«
19. December 2025
A distribution voltage regulator stabilizes LV feeders locally where PV and load peaks cause deviations. This practical example from ovag Netz shows how LVRSys® supports fast, measurable voltage control[...]
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Special Publication
LVRSys® Voltage Regulation in Low-Voltage Networks - Solving Pv-Related Overvoltage Issues
4. December 2025
The LVRSys® low voltage regulation system stabilizes voltage in PV-dominated low-voltage networks, preventing EN 50160 violations and avoiding expensive grid reinforcement.[...]
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Webinar
»Cyber Security« Webinar: A Challenge for European Energy Companies
3. December 2025
Webinar recording from 2025-11-26: »Cyber Security« - A Challenge for European Energy Companies[...]
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Blogpost
A. Eberle at the Schwabach City Run 2025
24. November 2025
A. Eberle was represented by 37 participants at the 2025 Schwabach City Run, setting a new internal record for participation. Particularly noteworthy is Benjamin Rentsch's first place in the M 35 40 age[...]
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Special Publication
LVRSys®: It's All About the Right Voltage
7. August 2025
Summary Stable voltage quality is becoming increasingly important in modern distribution grids. Due to the growing feed-in of renewable energies […][...]
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General Knowledge
Power in Multiphase Systems
7. August 2025
This technical report highlights the special features of power transmission in three-phase systems and offers valuable insights into the optimisation and analysis of modern power grids.[...]
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Blogpost
Visit From the Rudolf Diesel Technical School at A. Eberle
15. July 2025
We were happy to welcome you, Rudolf-Diesel-Fachschule! Yesterday, we had the pleasure of welcoming two classes of future electrical engineering technicians from the Rudolf-Diesel-Fachschule Nürnberg[...]
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