Integrated PV-powered water heating and battery systems PvPro - a half-way update

The PvPro project aims to develop and validate an innovative, renewable-based, water heating and energy management system. PvPro was funded through the 2022 Research and Innovation scheme of the Energy and Water Agency with project number EWA/37/23/1. The system is based on a PV-array as the energy source. PVs are a renewable, clean energy that can generate enough electricity to meet a Maltese household’s requirements even in cloudy days. During warm weather, the PVs are switched to deliver the energy to a battery-powered system that provides the lighting and communication circuits in the house.

The energy cycles are managed through a specialist management system. The aim of the project is to develop a fully functional prototype, which will then be taken to low-volume production after the project end. The aimed-for market of the end product is a typical Maltese household. The aimed-for market of the end product is a typical Maltese household.

The first stage of the PvPro project successfully laid the essential foundations for developing a photovoltaic-powered water-heating and energy-management system tailored to Maltese households. The research team began by examining the characteristics of domestic electric water heaters and the broader local context, identifying the most suitable systems for solar-electric operation. Work then progressed to the creation of detailed simulation models representing both the photovoltaic source and the electric water-heating load. The models allowed the team to analyse performance under real environmental conditions and evaluate potential control strategies in a virtual environment before moving to physical development. A strong analytical base resulted from the modelling activities, supporting a clearer understanding of how photovoltaic energy could be used effectively and safely for household water heating.

The design phase that followed translated the modelling insights into early engineering concepts for a functional controller and system architecture. Draft layouts, switching arrangements, protection features and integration strategies were developed and refined through close technical collaboration. Attention was given to how the control electronics could be incorporated into existing water-heater enclosures, how the system would respond to varying weather conditions and how operational safety could be maintained at all times.

The conclusion of Stage 1 signalled a major step forward for the project, as the proposed architecture was validated as technically feasible and ready for advancement to full hardware prototype development. A clearer view of the challenges ahead emerged, including enclosure design, component selection and optimisation of the control method. The achievements of this stage created a solid and confident transition from conceptual and analytical work toward the construction and testing of the first hardware prototype.