Based on the master data for installed PV systems we calculate for our customers location-specific or regionally aggregated production profiles . The master data shall include inclination and azimuth of deployed or planned systems. Historical or projected irradiation data and the orientation of the PV systems are used to calculate direct and diffuse radiation, module temperatures and their dependency on the type of module mounting. These calculations are possible for almost any location in the world. Likewise, we can calculate the energy losses if feed-in limits for local networks apply. Those losses can be estimated with and without consideration of local loads and/or storage systems.