The REDUXI team has successfully completed a forward-looking pilot project at Maltatalweg in Carinthia. The goal was to maximize self-consumption within a multi-family residential building through intelligent control while simultaneously minimizing grid feed-in — with excellent results.

Objectives & Implementation

At the core of the project was precise real-time control of two M-TEC hybrid battery storage systems, each with a storage capacity of 30.7 kWh. A particular focus was placed on the integration and optimization of a shared generation facility (GEA).

What is a GEA?

A shared generation facility (Gemeinschaftliche Erzeugungsanlage – GEA) enables multiple usage units — such as apartments in a multi-family building — to jointly use electricity generated by a central PV system. Instead of simply feeding electricity into the grid, the energy is distributed locally to where it is needed at that moment. This significantly increases self-consumption and reduces feed-in to the public grid.

Technically, this is achieved through a central energy management system that collects real-time data from the grid operator’s smart meters for each individual unit. At the same time, current PV production and the state of charge of the batteries are taken into account. The REDUXI Controller analyzes this information in real time and controls energy distribution with second-level precision: first supplying direct consumption, then charging the batteries.

GEAs are based on defined grid-technical and legal frameworks, such as § 16a of the Austrian Electricity Industry and Organization Act (ElWOG). A metrologically compliant billing system ensures that each unit pays only for its actual consumption. Surplus energy is stored or fed into the grid on a proportional basis.

Technical Details of the Control System

A key element of the project is the real-time processing of data from the grid operator’s smart meters via the new Reduxi P1 Ultra. The REDUXI Controller uses this data to control the entire system flexibly and according to demand — depending on consumption, time of day, and PV generation.

Of particular note is the nighttime discharge of the batteries:

“Even when no PV production is available, the system ensures fair and efficient supply. In this case, the self-sufficiency rate was increased from around 35 % (PV only) to approximately 70 % — solely through the combination of battery storage and intelligent distribution within the GEA,” reports Johann Lomšek, CEO of Reduxi DACH GmbH, with pride.

The installation was carried out by ELKOtec Smart Energy GmbH. Managing Director Ing. Werner Konrad emphasizes:

“The integration was technically demanding, but the result demonstrates what is already possible today. The solution is future-proof and scalable. For us as a solution provider, this represents another milestone in making battery storage systems even smarter.”

Installation & Project Participants

The REDUXI Controller, along with gateways and converters, was installed in the control cabinet. The M-TEC battery systems and electricity meters were integrated and connected to monitoring. In addition, the grid operator’s smart meters were configured for data communication via the P1 interface. For this purpose, the Reduxi P1 Ultra converter was used, seamlessly transferring smart meter data to the controller. Technical support was provided by Alex from the REDUXI DACH team.

Future-Proof Through Remote Access

Via the REDUXI Cloud, full remote access to the energy management system is available — location-independent and in real time. Monitoring, fault diagnosis, software updates, and configuration adjustments can all be performed remotely at any time, without requiring technicians on site.

This not only saves time and operating costs but also significantly improves response speed when optimizations or issues arise. Especially for more complex installations with multiple generators, storage systems, and consumers, this digital access represents a decisive advantage — for operators, installers, and residents alike.

“The strength of our system lies in consistent real-time optimization. Reduxi combines energy management with immediate responsiveness, seamlessly supporting both GEA structures and energy communities — putting us a technological step ahead,” says Johann Lomšek, CEO of Reduxi DACH GmbH.

This project demonstrates how jointly generated electricity can be distributed efficiently and fairly — with tangible impact on self-consumption, grid stability, and independence from the electricity market. The combination of GEA, intelligent control, and battery storage makes modern energy concepts in multi-family buildings practically viable today.