The focus of this paper is to establish the sustainability of the design and output parameters of a solar photovoltaic (PV) system installation developed as a living laboratory at the University of Portsmouth United Kingdom. Using a combination of secondary and primary data, it involves the projection of design and operating parameters over a period of twentyfive (25) years which is the useful life of the solar panels. It identifies the maximum power point (MPP), economic breakeven point and discusses the environmental implications. It recommends that for sustainability, a combination of storage and tie-in to grid is required to manage excess power during off-peak time.