The research work targeted on performance evaluation of power generated from solar source in the case of Ethiopian Civil Aviation Authority, at a specific location of Arbaminch, southern Ethiopia. All the Authority electronic equipment that are used for communication, demands a reliable and stable source of electrical energy to function. Especially ground to air and air to ground radio voice and signal communication requires the highest level of power quality and security. Hence, the quest for obtaining this source of energy from different means is mandatory. The communication equipments are installed at remote areas, on top of mountains, to avoid communication obstacles and to attain quality signal strength, where there is no reliable conventional power supply. But today other forms of energy are being harnessed, so as to convert to electrical energy, solar energy. The solar Arrays of Arbaminch were faded, shaded with dust and tree as a result the PV arrays canâ€Ÿt deliver the required power in order to charge solar batteries, so that the batteries frequently discharged and eventually discarded before the service year. Twelve solar batteries each 2V/3266AH was purchased with more than one million birr and installed for Arbaminch solar site. The performance evaluation was made on panels, storage battery, solar charger, inverter and the connecting cable. The evaluation were done based on the literature review of similar plants, actual site observation, technical and meteorological data collected, then the measurement and the PVsyst software result were compared and discussed. PV power supply system performance losses were considered. Effect of temperature, shad and dust, improper sizing, tilt angle, and effect of irradiance were considered. Based on the name plate data of the component the total power generated from the PV Array were 2.72kW before loss and minimum energy 13kWh/day with inverter and charge controller power capacity of 3kW but only 0.56kW were supplied to the load and the rest wasted. The PV syst simulation results are indicator parameters whether the PV can charge the battery effectively or not. Based on other countries, the expected performance Ratio (PR) value were more than 0.7 but in the case of Arbaminch the Ratio achieved were below 0.5 and this shows that there is a minimum loss of 0.2 (20%). Moreover, the fill factor value obtained 0.62 but the expected value is 0.8 and more, this shows that there is a loss. The optimal power sources interfacing mechanism and the best performance up grading means in terms of technical and economical benefits was recommended.