CYPELEC PV Systems is a program for designing and analysing photovoltaic electrical systems. The program has BIM integration resources and can import architectural models generated in IFC format, and offers a library of elements to define the system properties. CYPELEC PV Systems includes an energy design tool that helps users to calculate the number of PV modules required based on energy consumption and solar irradiation data. The system elements, such as solar panels, inverters and batteries, can be entered and the calculation can be made by considering parameters such as orientation, sloping and shading. The program can also be used to define the single-line diagram of the system, calculate the wiring design, generate bills of quantities and obtain detailed results, such as the energy generated, losses and electrical parameters.