How much electricity do solar panels make in Johannesburg, South Africa?
≈ 7,412 kWh a year
In Johannesburg, South Africa, ten 400 W mono PERC solar panels (4 kWp) on a roof facing the equator at the best yearly tilt (25°) make about 7,412 kWh of electricity a year — 1,853 kWh for every installed kilowatt.
1,853 kWh/kWpspecific yield per year
25°best yearly panel tilt
2,056 kWh/m²yearly sunlight on level ground
Septemberbest month (February lowest)
Solar energy month by month in Johannesburg
| Month | 4 kWp system (kWh) | per kWp (kWh) |
|---|---|---|
| January | 619 | 155 |
| February | 557 | 139 |
| March | 599 | 150 |
| April | 557 | 139 |
| May | 612 | 153 |
| June | 587 | 147 |
| July | 641 | 160 |
| August | 669 | 167 |
| September | 670 | 168 |
| October | 658 | 165 |
| November | 621 | 155 |
| December | 621 | 155 |
How these numbers were calculated
NASA POWER long-term monthly means on a 1° grid around the city, the monthly method of Duffie & Beckman (isotropic sky, each month's average day), panel temperature from NOCT, 10 % other losses and a 96 % inverter. No shading, snow or product-specific data; expect ±10 % against a detailed tool such as PVGIS. To change the number of panels, their rating, tilt, direction or your roof size, use Blorp's free solar roof tool — every result shows its equation and the numbers used.