The electrical energy requirements of a few typical rural applications like micro-irrigation, flour-mill, potable water supply, community T.V. Centre, domestic and street-lighting are first considered. The size of the solar cell panels and the storage battery are determined for the stand-alone roof-top photovoltaic systems for these applications assuming a trapezoidal pattern of insolation. The balance of systems (B.O.S.) costs for these applications are estimated on the basis of Indian market ratings. The B.O.S. cost per peak-watt varies almost exponentially with the size of installation upto the range of 10 000 peak watts above which it varies rather slowly. The absolute value of B.O.S. cost appears to be significantly less than that estimated by NASA-LeRc under U.S. conditions. The photovoltaic energy costs per kWh for these applications are also estimated which, too, indicate an economy of scale size of installation upto a range of 1 000 peak watt.