Solar Energy Analysis for Johannesburg, South Africa
Solar Overview
The solar resource in Johannesburg provides around 3,036 annual sun hours, with optimal conditions during August. The -26.20° latitude location provides near-optimal solar geometry, with only slight seasonal fluctuations. Johannesburg offers good solar potential, making it economically viable for both residential and commercial photovoltaic installations.
Geographic Impact
The specific coordinates of -26.2041°N, 28.0473°E establish Johannesburg's unique solar energy potential. This latitude benefits from the sun crossing the zenith point at least once annually, maximizing potential energy capture from flat or low-tilt installations.
Rating Methodology
Solar potential in Johannesburg is rated "Good" based on detailed evaluation of irradiation levels (3,036 hours), temperature conditions (16.5°C), and seasonal patterns. The temperate climate provides excellent conditions for solar panels, minimizing thermal efficiency losses while avoiding cold-weather challenges. Johannesburg's solar conditions support reliable energy production, with systems typically generating 1,200-1,400 kWh per installed kW yearly.
Understanding the Data
The monthly sun hour distribution for Johannesburg is illustrated in the chart below. Solar energy production is relatively balanced throughout the year, with August receiving the most sun hours. This distribution pattern helps inform decisions about fixed versus tracking systems and optimal capacity design.
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