To find Sunhours/day, 1. u need to have the solar irradiance values for every 10 minutes intervals of the day. 2. Note the time interval for which solar irradiation remains significant say..200w/m2 and above for the day. 3.Multiply this time interval (in hrs) with the average of the irradiance values noted throughout the day. 4. u will get the incident solar energy (kwh/m2) 5. Now when we divide this incident solar energy
by the reference irradiance which is 1KW/m2 to get the no of peak sun hours.