Month | Solar radiation on horizontal surface (Kwh/m2 day) | Solar radiation on fixed 20.83˚ tilt surface (Kwh/m2 day) | Efficiency (%) |
Jan | 4.149 | 4.831 | 16.430 |
Feb | 4.942 | 5.520 | 11.690 |
Mar | 5.502 | 5.865 | 6.590 |
Apr | 6.020 | 6.055 | 0.581 |
May | 6.002 | 5.857 | −2.415 |
Jun | 5.213 | 5.053 | −3.069 |
Jul | 4.990 | 4.860 | −2.605 |
Aug | 5.003 | 4.949 | −1.079 |
Sep | 4.521 | 4.598 | 1.703 |
Oct | 4.576 | 4.960 | 8.391 |
Nov | 4.422 | 5.132 | 16.056 |
Dec | 4.082 | 4.876 | 19.451 |
Average | 4.952 | 5.213 | 5.977 |