Learn the 59 essential solar calculations and examples for PV design, from system sizing to performance analysis. Empower your solar planning or education with SolarPlanSets. Caution: Photovoltaic system performance predictions calculated by PVWatts ® include many inherent assumptions and uncertainties and do not reflect variations between PV technologies nor site-specific characteristics except as represented by PVWatts ® inputs. For example, PV modules with better. . The calculation of the PV generation profiles in nPro is based on a detailed calculation model, which is described in Lämmle et al. : "PVT Collector Technologies in Solar Thermal Systems: A Systematic Assessment of Electrical and Thermal Yields with the Novel Characteristic Temperature Approach". . Batteries convert electrical energy into chemical energy are used with direct current. The flow rate of electrons is measured in amperage (A). The solar industry uses the capital letter “I” to represent current.