Solar PV for all ("SPV4ALL") is an initiative taken by TERI, and supported by Shakti Sustainable Energy Foundation (SSEF) to promote solar PV systems in India and developed by Hardcastle GIS Solutions Pvt. Ltd.. The 'SPV4ALL' mobile application is initially developed for Android mobile devices, using which users can estimate the electricity production of a grid-connected or, off-grid solar photovoltaic system based upon few simple input parameters. To use the solar simulation tool under 'SPV4ALL' mobile application, user will need to select a location of interest on map either through find location or, using in-built GPS, specify the space available to install the solar PV system, and provide some basic information about the system cost, and electricity rate. 'SPV4ALL' mobile application calculates estimated value of electricity production, capital investment cost, CO2 savings, payback, find local solar PV installers etc. for the user define solar PV system.