Renewable energy sources (RES) are one of the fastest growing technologies in recent years and solutions the rollout of which is recommended by many governmental and non-governmental organisations, including the European Union. The premise of the technology is to harvest energy mainly from solar radiation, but also from other sources, like hydrogen, wind, water, biomass, biogas, bioliquids and biofuels, as well as nuclear power in a closed fuel cycle. The use of such energy sources is not at risk with their prolonged shortage, as the resources are renewed in a relatively short time (hence, they are renewable raw materials). The most common devices known by man and designed for harvesting renewable energy from the sun’s radiation are photovoltaic (PV) panels, which in combination with the rest of the photovoltaic system (inverter(s)) generate electrical power that can be used to power domestic appliances or a heat pump with which to heat the home. A photovoltaic system of sufficient capacity combined with an energy storage system, heat pump and electric car charger makes it possible to become almost completely independent of fossil fuel energy. This has a significant impact on reducing energy costs for the property owner and improving air quality in the area.