The open circuit voltage increases due to the reduction in module temperature during the period 08:00 AM to 03:00 PM. During The period 06:00 AM to 07:00 AM the open circuit voltage of reference module is higher than that of the module with proposed cooling system. This is due to the above-mentioned permanent obstacle and the small difference in modules temperature at sun-rise time as shown in Figs. 5 and 6.