The study, initiated and conducted by Auroville Consulting for Varuna Pvt. Ltd., aimed to survey homes and facilities in Auroville which, either by choice or by external circumstances, are not connected to the utilities’ electric grid but rely mostly on solar PV stand-alone systems for their daily electric energy supply. Different solar PV system configurations were analysed and compared by a cost-benefit analysis. The study recommends whether the increase of the efficiency of existing solar PV systems or the connection to the grid will be the financially and environmentally more sustainable solution.