Solar PV Analysis of Hermanus, South Africa
Hermanus, Western Cape, South Africa is a decent location for generating solar energy year-round due to its position in the Southern Sub Tropics. The amount of electricity that can be produced from each kilowatt of installed solar power varies by season.
In the summer, you can expect around 7.89 kilowatt-hours (kWh) per day for each kilowatt (kW) of installed solar power. This decreases to about 4.47 kWh/day in the autumn and further drops to approximately 3.38 kWh/day during winter months before increasing again to around 6.65 kWh/day in spring.
The best times of year for generating solar energy at this location are during the summer and spring seasons when sunlight hours are longer and more intense compared with other seasons.
For maximum yearly production from your solar panels at this location, it's recommended that they're tilted at an angle of 30 degrees facing North.
As far as environmental or weather factors go, there could be some potential issues which might affect your solar output such as dust accumulation on panels or occasional cloudy days which could reduce sunlight exposure on your panels, but these aren't significant enough to seriously impede production.
To combat these issues, regular maintenance like cleaning off any dust or debris from your panels can help ensure they're working efficiently all year round.
Also consider installing tracking systems that allow your panels to follow the sun’s path across the sky throughout different times of day and seasons; this will maximise their exposure to sunlight hence producing more energy than fixed panel installations would do under similar conditions.
Note: The Southern Sub Tropics extend from -23.5° latitude South down to -35° latitude.
So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 196 locations across South Africa. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.
Link: Solar PV potential in South Africa by location
Solar output per kW of installed solar PV by season in Hermanus
Seasonal solar PV output for Latitude: -34.4153, Longitude: 19.2287 (Hermanus, South Africa), based on our analysis of 8760 hourly intervals of solar and meteorological data (one whole year) retrieved for that set of coordinates/location from NASA POWER (The Prediction of Worldwide Energy Resources) API:
Ideally tilt fixed solar panels 30° North in Hermanus, South Africa
To maximize your solar PV system's energy output in Hermanus, South Africa (Lat/Long -34.4153, 19.2287) throughout the year, you should tilt your panels at an angle of 30° North for fixed panel installations.
As the Earth revolves around the Sun each year, the maximum angle of elevation of the Sun varies by +/- 23.45 degrees from its equinox elevation angle for a particular latitude. Finding the exact optimal angle to maximise solar PV production throughout the year can be challenging, but with careful consideration of historical solar energy and meteorological data for a certain location, it can be done precisely.
We use our own calculation, which incorporates NASA solar and meteorological data for the exact Lat/Long coordinates, to determine the ideal tilt angle of a solar panel that will yield maximum annual solar output. We calculate the optimal angle for each day of the year, taking into account its contribution to the yearly total PV potential at that specific location.
Seasonally adjusted solar panel tilt angles for Hermanus, South Africa
If you can adjust the tilt angle of your solar PV panels, please refer to the seasonal tilt angles below for optimal solar energy production in Hermanus, South Africa. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 30° North tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 19° North in Summer | 39° North in Autumn | 49° North in Winter | 27° North in Spring |
Our recommendations take into account more than just latitude and Earth's position in its elliptical orbit around the Sun. We also incorporate historical solar and meteorological data from NASA's Prediction of Worldwide Energy Resources (POWER) API to assign a weight to each ideal angle for each day based on its historical contribution to overall solar PV potential during a specific season.
This approach allows us to provide much more accurate recommendations than relying solely on latitude, as it considers unique weather conditions in different locations sharing the same latitude worldwide.
Calculate solar panel row spacing in Hermanus, South Africa
We've added a feature to calculate minimum solar panel row spacing by location. Enter your panel size and orientation below to get the minimum spacing in Hermanus, South Africa.
Our calculation method
- Solar Position:
We determine the Sun's position on the Winter solstice using the location's latitude and solar declination. - Shadow Projection:
We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle. - Minimum Spacing:
We add the shadow length to the horizontal space occupied by tilted panels.
This approach ensures maximum space efficiency while avoiding shading during critical times, as the Winter solstice represents the worst-case scenario for shadow length.
Topography for solar PV around Hermanus, South Africa
Hermanus is situated in the Western Cape Province of South Africa. The topography around Hermanus is diverse, with the town itself nestled between mountains and the Atlantic Ocean. To its east are rolling hills and valleys, while to its west lies a rugged coastline characterized by cliffs and sandy beaches. The area also features numerous rivers and wetlands.
The region's climate is Mediterranean, with warm summers and mild winters. It has an average of 290 sunny days per year, which makes it suitable for solar energy production.
Large-scale solar photovoltaic (PV) installations require large tracts of land that receive high levels of sunlight throughout the year. Given this requirement, areas towards the inland regions near Hermanus could be potentially suitable for such installations due to their relatively flat terrain compared to coastal areas. Areas like Caledon or Riviersonderend may be suited because they have more open farmland spaces where large scale PV panels can be installed without causing much disruption to local ecosystems or communities.
However, feasibility studies would need to be conducted before making any decisions as factors such as land use permissions, environmental impact assessments, grid connectivity options and potential shadowing effects from surrounding mountains will need consideration.
South Africa solar PV Stats as a country
South Africa ranks 21st in the world for cumulative solar PV capacity, with 6,221 total MW's of solar PV installed. This means that 2.00% of South Africa's total energy as a country comes from solar PV (that's 34th in the world). Each year South Africa is generating 105 Watts from solar PV per capita (South Africa ranks 38th in the world for solar PV Watts generated per capita). [source]
Are there incentives for businesses to install solar in South Africa?
Yes, there are several incentives for businesses wanting to install solar energy in South Africa. The government offers a range of financial incentives and tax breaks for businesses that invest in renewable energy projects. These include the Renewable Energy Feed-in Tariff (REFIT) program, which provides long-term contracts with guaranteed prices for electricity generated from renewable sources; the Accelerated Depreciation Allowance (ADA), which allows businesses to deduct up to 50% of their capital expenditure on renewable energy projects from their taxable income; and the Small Scale Embedded Generation (SSEG) program, which provides financial support for small-scale solar installations. Additionally, some local governments offer grants or subsidies to help offset the cost of installing solar systems.
Do you have more up to date information than this on incentives towards solar PV projects in South Africa? Please reach out to us and help us keep this information current. Thanks!
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Article Details for Citation
Author: Aaron Robinson
Publisher: profileSOLAR.com
First Published: Saturday 11th of May 2024
Last Updated: Monday 21st of July 2025
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Compare this location to others worldwide for solar PV potential
The solar PV analyses available on our website, including this one, are offered as a free service to the global community. Our aim is to provide education and aid informed decision-making regarding solar PV installations.
However, please note that these analyses are general guidance and may not meet specific project requirements. For in-depth, tailored forecasts and analysis crucial for feasibility studies or when pursuing maximum ROI from your solar projects, feel free to contact us; we offer comprehensive consulting services expressly for this purpose.
Helping you assess viability of solar PV for your site
Calculate Your Optimal Solar Panel Tilt Angle: A Comprehensive Guide
Enhance your solar panel's performance with our in-depth guide. Determine the best tilt angle using hard data, debunk common misunderstandings, and gain insight into how your specific location affects solar energy production.
