Successfully Implemented: Intelligent Charging Infrastructure for 90 Parking Spaces in the Underground Garage
- DaheimLaden
- Jul 4
- 3 min read
From an Idea to Reliable Charging Infrastructure for All
A Case Study on Implementing EV Charging in WEG 175 Marie, Frankfurt
When an idea becomes reliable charging infrastructure for all: As the manufacturer of DaheimLaden EV chargers, we support homeowners’ associations (WEGs) technically and conceptually in their implementation. In this article, we showcase how we successfully realized a charging project in a homeowners’ association—and what matters for similar projects.
Objective: Expanding Charging Infrastructure in the Underground Garage
The homeowners’ association WEG 175 Marie in Frankfurt pursued a forward-looking goal: the consistent expansion of EV charging infrastructure in their underground garage. Existing EV chargers from other manufacturers were the starting point—however, these lacked intelligent control or load management.
The charging infrastructure in the WEG underground garage was to be expanded by 90 additional charging points. The challenge: the existing infrastructure could not handle the additional continuous load from 90 more EV chargers without risking overload. Additionally, the project had to comply with §14a EnWG (German Energy Industry Act).
Preparations for the Charging Infrastructure
From December 2024 to February 2025, the expansion included 90 additional charging points and preparatory installations without mounting EV charger hardware. These are distributed across two underground garage levels:
38 parking spaces in the 1st underground level
55 parking spaces in the 2nd underground level
The energy supply is provided through a central main connection, distributed across 11 technical rooms with varying fuse sizes.
Challenges in the WEG
The central task was to create a technically safe and legally compliant solution for EV charging in an existing building with limited connection capacity.
The Main Challenges
Avoiding grid overloads due to simultaneous charging of multiple vehicles.
Integration into existing technical rooms with individual main connections.
Compliance with §14a EnWG: All charging points must be prepared for potential throttling by the grid operator.
Compatibility with existing, non-controllable infrastructure.
Creating a scalable and future-proof solution for the entire homeowners’ association.
Additionally, each EV charger should be billed directly through the individual electricity meter of the respective residential unit—a typical requirement in multi-family housing structures.
Solution: Decentralized Charging Infrastructure with DaheimLaden Load Management
The homeowners’ association opted for a decentralized solution with dynamic load management from DaheimLaden. This concept is particularly suitable for existing buildings where each parking space user wants to retain their own household electricity tariff.
Implementation Details:
Connection of 90 new EV chargers directly to the electricity meters of the respective apartments.
Installation of 3 new electricity meters.
Color-coded installation zones for better allocation and documentation.
Installation of a DaheimLaden LoadManager in each affected technical room.
Intelligent Control with the DaheimLaden LoadManager
The core of the project is the modular DaheimLaden load management system, which uses transformer technology (clamp-on coils) to monitor the load of each main connection in real-time. This allows the charging power to be automatically reduced before critical overload occurs.
The LoadManager dynamically controls the connected DaheimLaden EV chargers based on the building’s current power consumption.
Charging power is temporarily reduced as needed, e.g., during high household usage at midday, and automatically increased when capacity becomes available.
Communication occurs via network cable (LAN, TCP/IP) directly between EV chargers and load management.
This control system also meets the requirements of §14a EnWG: All new charging points are equipped with an EEBus interface, allowing the grid operator to reduce charging power to 6 A per phase for two hours daily if needed.
Compatibility & Scalability
The system is designed for up to 25 charging points per LoadManager, making it modular and future-proof. Existing EV chargers remain operational but cannot be integrated into the load management system. Therefore, a medium-term standardization to DaheimLaden EV chargers is recommended.
Additionally, the DaheimLaden EV charger with the DaheimLaden DockingStation offers the option to prepare parking spaces with a connection for charging infrastructure. The DockingStation can be installed first, allowing the appropriate DaheimLaden EV charger to be purchased later. It only needs to be plugged in and secured with three screws. Learn more here!
Conclusion: More Charging Points, Maximum Safety, Legally Compliant
With the project at WEG 175 Marie, we demonstrate how modern and smart charging infrastructure can be implemented even in complex underground garages of multi-family buildings. Thanks to decentralized connections, intelligent load control, and full grid operator compatibility, the solution meets all current requirements—and provides room for further growth.
DaheimLaden offers not only high-performance EV chargers but also the appropriate intelligent control—ideal for larger real estate projects where safety, efficiency, and user-friendliness are paramount.
Ready to Plan Charging Infrastructure for Your Multi-Family Building?
Are you planning charging infrastructure for a multi-family building or looking to expand an existing system? We support you with expertise, concepts, and technology—from the initial idea to the final screw. And when the last torque is set, we maximize performance with the right software.
Let’s find out together what’s possible for your homeowners’ association—we’re happy to advise you. Simply send us an email or give us a call:
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