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The purpose of a power subsystem is to ensure reliable delivery of electrical power compatible with all loads under all foreseeable operational states and environments, during all mission phases, and over the intended design life of the loads and of the space vehicle and the power subsystem is unarguably the most critical subsystem on a satellite. Therefore, reliability, efficiency, autonomy, redundancy and size features become critical issues in design and implementation of a satellite power system. Moreover, these parameters associated with the power subsystem usually determine the lifetime of a satellite. This paper describes the design details with redundancy concept, autonomous operation, single point free architecture and sizing of RASAT flight model power subsystem. Technical description and the qualification level of each power system module are also presented. For the battery charge regulator, the parallel operation and an effective MPPT algorithm will be presented in detail. Moreover, the power production-consumption analysis and power system sizing will also be included for different scenarios.