Table 9.
Optimum tilt angle (degrees) and maximum incident solar radiation (W/m2) at various orientation for 21st day of every month in Lagos, Nigeria.
| Month | Day of the month (n) | Solar Declination | Position of the Sun | Tilt Angles | Orientation | Radiation Level |
|---|---|---|---|---|---|---|
| JAN | 21 | −20.13 | From the tropic of Capricorn | 16.8 | SFM | 151.82 |
| FEB | 21 | −11.21 | From the tropic of Capricorn | 16.8 | SFM | 144.59 |
| MAR | 21 | 0.02 | At the equator | 5.5 | NFM | 134.57 |
| APR | 21 | 11.95 | Towards the tropic of Cancer | 10.1 | NFM | 152.36 |
| MAY | 21 | 20.35 | Towards the tropic of Cancer | 10.1 | NFM | 149.50 |
| JUN | 21 | 23.34 | At the tropic of Cancer | 0 | Horizontal | 129.41 |
| JUL | 21 | 20.23 | Towards the equator | 10.1 | NFM | 91.94 |
| AUG | 21 | 11.38 | Towards the equator | 16.8 | SFM | 129.73 |
| SEP | 21 | −0.63 | At the equator | 10.1 | NFM | 108.34 |
| OCT | 21 | −12.13 | Towards the tropic of Capricorn | 0 | Horizontal | 122.57 |
| NOV | 21 | −20.65 | Towards the tropic of Capricorn | 16.8 | SFM | 158.58 |
| DEC | 21 | −23.44 | At the tropic of Capricorn | 16.8 | SFM | 142.80 |
Optimum tilt angle and maximum incident solar radiation at various orientation (SFM represents the South facing module, NFM stands for North facing module) for 21st day of every month in Lagos, Nigeria.