Photovoltaic (PV) modules (or solar panels) produce electricity using renewable solar energy. Refer to the Components of PV Systems - Modules schematic for more information. Software & Data The RETScreen Software Photovoltaic Power Model can be used worldwide to evaluate the energy production and savings, costs, emission reductions, financial viability and risk for central-grid, isolated-grid and off-grid photovoltaic (solar electric) projects. The software can model a wide variety of projects ranging from large scale multi-array central power plants, to distributed power systems located on commercial buildings and houses, to industrial remote wind-PV-genset hybrid power supplies, to stand-alone battery storage systems for lighting. For agriculture and water supply applications the daily and annual electricity use for water pumping can be estimated using a convenient water pumping tool. The software (available in multiple languages) also includes product, project and climate databases, and a detailed user manual