The RETScreen model for assessing potential PV projects

The RETScreen(R) software was developed to assist in the preliminary assessment of potential renewable energy projects. First released for on-grid applications, the RETScreen PV model was recently upgraded to cover off grid applications. These include stand-alone, hybrid and water pumping systems. The program guides the users in the design of their systems, by providing Initial estimates of array, battery, or pump size. By changing a few of the system's parameters, users are able to quickly screen the most effective technology and system size depending on load, climatic conditions, and season of use. This paper describes various models (radiation, array, battery, whole system) used to predict energy production from PV systems, given climatic variables and system parameters.