How much electricity do solar panels make in Cape Town, South Africa?
≈ 7,159 kWh a year
In Cape Town, 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 7,159 kWh of electricity a year — 1,790 kWh for every installed kilowatt.
1,790 kWh/kWpspecific yield per year
25°best yearly panel tilt
1,978 kWh/m²yearly sunlight on level ground
Januarybest month (June lowest)
Solar energy month by month in Cape Town
| Month | 4 kWp system (kWh) | per kWp (kWh) |
|---|---|---|
| January | 772 | 193 |
| February | 670 | 168 |
| March | 667 | 167 |
| April | 545 | 136 |
| May | 441 | 110 |
| June | 388 | 97 |
| July | 436 | 109 |
| August | 490 | 123 |
| September | 571 | 143 |
| October | 687 | 172 |
| November | 720 | 180 |
| December | 771 | 193 |
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.