This program uses PVlib to model grid tied residential PV systems in Trinidad and Tobago.  This model finds the location specfic power production of 4 sizes of PV systems, 2kW, 3kW, 6kW and 10 kW . It also performs an analysis of the potential demand charge savings for the household and the payback period. The code can  be easily modified to assess more than one house at a time. 