SmartGrid "Langer Graben" multi-storey car park in Schwäbisch Hall


The Langer Graben multi-storey car park in Schwäbisch Hall was thoroughly refurbished from 2020 to 2022. In the course of the renovation of the multi-storey car park P1: Langer Graben, one of the four parking levels with 108 parking spaces was first fully equipped with charging points with intelligent grid connection for e-vehicles as part of this pilot project. The car park was able to reopen on 15 October 2021. In addition to the renewal of the entire technology, the renovation also included a brighter appearance and the integration of a colour guidance system for better orientation.

Research Question

  • How can many charging points be integrated into the existing supply structure as cost-effectively as possible without major investments?
  • How can peak charging loads be avoided?
  • How can the electricity grid be stabilised by charging e-cars?
  • How can the charging points be distributed as efficiently as possible?
  • How can e-mobility be seamlessly integrated into public transport?
  • What can viable operator models look like?


E-charging stations were installed, each with two charging points with a maximum charging capacity of 22 kilowatts. For the cabling of the charging stations, an innovative cascaded connection system with intelligent distribution boxes (for up to five charging points each) was planned and implemented at the house connection, parking deck distribution and sub-distribution level. This made it possible to implement the cabling in the multi-storey car park much more cost-effectively and with considerably less copper than in previous implementations. In addition to the controllers in the distribution boxes, further controllers were installed per parking level and a central controller in the main distribution area. Through this cascaded intelligence, a highly efficient charging load management was realised that efficiently avoids local overloads in the distribution and also ensures grid-serving operation through the connection to the Venios system (grid status forecast) of the municipal utility. A possible future bidirectional use of the vehicle batteries was also taken into account and prepared.

As a scientific partner, HFT Stuttgart supported the joint project by developing AI-based methods for predicting and evaluating charging cycles for intelligent charging load management and providing scientific support during implementation. Data on charging behaviour and the utilisation of the charging infrastructure was collected via monitoring, which was used to analyse the efficiency and effectiveness of the developed methods. This enabled the latter to be optimised and prepared for further dissemination. In addition, HFT Stuttgart developed an innovative and intuitive prototype mobile application for charging point reservation and real-time monitoring of the charging process.

QR Code zur Web-App zur Visualisierung der Auslastung der Ladeinfrastruktur des Parkhauses Schwäbisch Hall/ QR Code for web app to visualise the utilisation of the charging infrastructure of the Schwäbisch Hall multi-storey car park



  • Development of a car park simulation and representation of the charging processes of EVs
  • Forecast of parking space occupancy and charging load development
  • Establishment of a car park monitoring system to record the power consumed per parking space
  • Statistical analysis of the charging behaviour for the Langer Graben car park in Schwäbisch Hall
  • Development of a classification model to distinguish vehicles on the basis of measurement data
  • Implementation of a web app to visualise the utilisation of the charging infrastructure of the Schwäbisch Hall multi-storey car park (see QR code on the right)
  • Consideration of the possibility of stabilising the electricity grid through charging load management
ManagementProf. Dieter Uckelmann (ZeDFLoW), Prof. Bastian Schröter (
PartnerStadtwerke Schwäbisch Hall
FundingMinistry of the Environment, Climate Protection and the Energy Sector Baden-Württemberg
Call for proposalInput 2.0
ProgrammeBWPLUS – Baden-Württemberg Programm Lebensgrundlage Umwelt und ihre Sicherung
Duration(15.11.20) 01.02.2021 - 31.01.2022, extended until 30.09.2022



Name & Position E-Mail & Telephone
Professor+49 711 8926 2371 7/028
Professor / Wissenschaftlicher Direktor+49 711 8926 2632 2/145
Akademischer Mitarbeiter 7/012