SISIFO is an online, free-software, simulator of PV systems developed by the IES-UPM in the frame of the European project PVCROPS. This first version of SISIFO allows the simulation of different types of grid-connected PV systems, such as large grid-connected plants and building-integrated installations.
To use SISIFO, you must provide information about the location of system, the solar resource data, the technical characteristic of the system and, optionally, system economics. Using this information SISIFO predicts the performance of the PV system, provides a standard economic analysis, and generates a simulation report in pdf.
SISIFO is free-software. You can download the source code here.