The Commission is in the process of updating some of the content on this website in light of the withdrawal of the United Kingdom from the European Union. If the site contains content that does not yet reflect the withdrawal of the United Kingdom, it is unintentional and will be addressed.

PV-ESTIA – an Interreg Balkan-Med project transforming buildings into a controllable energy source

Share this Post:

In the framework of the PV-ESTIA project, the performance of the proposed PV+storage Innovative Management Scheme will be evaluated under real-field conditions. Pilot installations will be selected with the aim to examine if and how the size of the Energy Storage Systems and the different geographical conditions affect the performance of the innovative management scheme. The pilot installations include the following cities:

  • Thessaloniki, Greece
  • Kozani, Greece
  • Nicosia, Cyprus
  • Plovdiv, Bulgaria
  • Skopje, North Macedonia


The research committee building of the Aristotle University of Thessaloniki has been selected as pilot site. The pilot consist of:

  • 15 kWp  PV  panels +  15 kW  inverters +   18 kWh batteries
  • Metering and control equipment for monitoring both electrical and thermal energy
  • Communication, data acquisition  & display features

During the pilot operation the overall building energy performance, both thermal and electrical, will be monitored under different operational scenarios. More specifically the following building features will be monitored: Thermal loads (heating & cooling). Ventilation, outdoor and indoor temperatures, PV generation, electrical loads, energy storage.



The Technological Research Center of Western Macedonia plans to install a 20 kWp PV installation coupled with 2 hybrid inverters (2x10kW) and LiFePO4 energy storage system (10,24 kWh/inverter), located within one of the buildings of the student dormitories of the research center. The system will be also accomplished with power metering system. All technical specification and standards of the system have been determined and the purchases of the inverter and battery systems are to be contracted. The tender relating to the PV panels, their base structures and installation is ongoing and will be finalized by mid-November. The full pilot is expected to be finalized by March 2019.



The University of Cyprus (UCY) is responsible for the implementation of two different pilot systems in Nicosia, Cyprus. Specifically, a public pilot is planned to be installed at the New Nicosia Town Hall, where an existing 12 KWp PV system will be AC-coupled with a 15 KW / 29.7 KWh Lithium-ion Battery Storage System (BSS), including a power metering system. The New Nicosia Town Hall is the first building in Cyprus in which all the required bioclimatic design principles have been implemented in order for the building to be considered as a passive building.


In addition, five residential pilots are to be implemented in the wider area of Nicosia. These are pilots with typical energy consumption and already installed PV systems, where 2.5 KW / 9.3 kWh Lithium-ion BSS is to be integrated in each site. All technical specifications and standards of the Public and Residential systems have been determined and the purchase of the equipment has been contracted. All pilots are already commissioned.



PV ESTIA installed a total of 48 kWh storage capacity within 5 newly established prosumers by implementation of 5x9,6kWh LiFePO4 battery storage systems and 5x5kW hybrid inverters, transforming participating households and buildings to nearly-zero energy households/buildings.


The implemented scheme targets to maximize the self-consumption of each prosumer. Using the LiFePO4 energy storage systems, the prosumers will be able to accumulate energy in hours of high production and low own-consumption, and then, when no production is available, the stored energy can be consumed for own needs. In this way, each prosumer is able to increase its electricity self-consumption and to achieve partial energy independence. At the same time, this type of systems would be able to discharge the excess energy generated and stored towards the grid, when such business models became possible.


Each pilot system will also be equipped with AC/DC energy analysers and data loggers, grouped into a monitoring systems, providing real-time data from various system points - energy production, energy storage and grid consumption.



As part of the PV-ESTIA project, an energy storage system has been installed at the Faculty of Electrical Engineering and Information Technologies. Standing in the hall of the annex building, a metal casing holds the 7.7 kWh Lithium Titanate (LTO) battery. It has been coupled with a Canadian Solar PV generator with a capacity of 10 kWp through a hybrid inverter, while an additional PV generator with a capacity of 12 kWp has also been installed. In order to fully monitor the system’s operation in real time (currents, voltages, power, energy, power factor, harmonics), monitoring equipment is being installed so as to provide continuous, reliable and accurate measurements. The data obtained from the measurements shall later be used for optimizing the battery operation modes.



The second group of pilots includes the installation of Smart meters in prosumers and consumers installations. Measurement data will be acquired continuously for a period of at least one year and an exhaustive statistical analysis will be performed to derive typical consumption and generation profiles for the Balkan-Med region.

Award labels

Available link languages

Start date - End date

wtorek, 1 Sierpień, 2017

Operational date

wtorek, 31 Marzec, 2020

Source of funding


Funding description

Enhancing storage integration in buildings with Photovoltaics (PV-ESTIA) is a project funded by the transnational Cooperation Programme Interreg V-B "Balkan-Mediterranean 2014-2020" and co-funded by the national funds.