The PV array efficiency shows an excellent performance by more than 6% during the months from June 2011 to August 2011. During the first three months of exposure, the PV array efficiency varies from 6.25 to 6.06%. The maximum and minimum monthly PV array efficiencies are 6.25% and 5.75% respectively. In terms of monthly PV array efficiency, the efficiency of the PV array lies in the range of 6.25 to 5.76%, with annual PV array efficiency of about 5.93%. On the other hand, system efficiency ranges from 5.17 to 5.70% during the first year of operation. In addition, the annual efficiency of the entire PV system is about 5.35%. In terms of the monthly efficiency inverter, the DC energy output was evaluated by dividing the output AC energy. From the results obtained, the SMA inverter operated very well, ranges from 89.2 to 93.8% with an annual conversion efficiency of about 90.2%.