Here’s a table about the daily average peak sun hours in South Africa.
Peak sun hours (South Africa)
|Rank||Province||Daily Average Peak Sun Hours
(Solar irradiance kWh/m2)
|1||Northern Cape||6.2 hours|
|2||North West||5.9 hours|
|3||Free State||5.8 hours|
|7||Western Cape||5.4 hours|
|8||Eastern Cape||5.2 hours|
- On average South Africa receives between 4.9 – 6.2 peak sun hours daily.
importance of peak sun hours
Solar panels are designed to produce their rated power rating under STC (standard test conditions), which are: 1 kWh of solar irradiance, 25°C (77°F) temperature, and 1.5 air mass.
1 Peak sun hour = 1 kWh/meter2 of sunlight intensity (solar irradiance).
Why consider peak sun hours?
- It helps to select the ideal size solar system for your house/RV rooftop to fulfill your electricity need.
- It helps to give an estimated output from solar panels.
how to use peak sun hours?
- Daily electricity need = 10kWh
- Daily average peak sun hours = 5
(10 kWh ÷ 5) x 1.3 = 2.6 kWh or 2600 watts
2600 / 300 watt solar panel = 8.6 (300 watt) solar plates required
Related Post: Solar Panel Output Calculator
peak sun hours map south Africa
Peak sun hours (south Africa): FAQs
On average, Pretoria receives about 5.3 peak sun hours daily.
On average, Johannesburg receives about 5.4 peak sun hours daily.
On average, cape town receives about 5.2 peak sun hours daily.