From Figure 8, the monthly PR varies from 82% to 90.3% which shows the value of PR is quite consistent. A decrement of about 8.4% is observed for the final operation as compared to the initial month value. In addition, the system appears to be operating well since the annual PR value is about 85% with an availability of data at 99% over the entire period monitored. Based on literature [12], a high PR of about 60-80% indicates that the system operates in a better situation and utilizes the full potential of solar energy, while a lower PR value could be due to technical or design problems.