The photovoltaic power system, PVPS, converts the solar radiation directly to electricity without fuel , moving parts , noise and greenhouse gases emission then it's a clean and environmentally friend power system . This paper introduces a complete design of PVPS based on energy balance condition , EB , and maximum power points , MPPs , tracking technique to feed the simulated load in an Egyptian remote site ,Marsa-Alam. This load consists of four radar stations , automatic command center , manual command center, communication center , charging center and lighting for the radar battalion . Also, the design parameters obtained by applying the EB have been compared with the design parameters obtained by using the MPPs tracking technique. A new computer Matlab Program has been designed and operated to determine the hourly MPP through the daily day time along the year.