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This paper proposes a new strategy used to optimize the demand side management for a stand-alone photovoltaic system (SAPS) without ancillary source in desert regions. It is based on developed load profile, actual weather conditions and energy storage. The intended objectives are house energy comfort and economic size of the system. The first objective was achieved by reducing the loss power supply probability (LPSP), which leads to the reduction of load shedding. The second objective is attained by reducing the batteries replacement through the improvement of the life cycle of batteries. The size of an experimental SAPS without load management was used for case study. (C) 2013 Elsevier Ltd. All rights reserved.