Solar PV Analysis of Ratnapura, Sri Lanka
Ratnapura, Sabaragamuwa Province, Sri Lanka is a pretty good place to generate solar energy year-round. This is because it's located in the Tropics where sunlight is fairly consistent throughout the year. The amount of energy you can expect to get from each kilowatt of installed solar varies slightly depending on the season, but not by much. In summer you can expect about 5.47 kilowatt-hours per day, in autumn about 4.94 kWh/day, in winter about 5.60 kWh/day and in spring about 5.93 kWh/day.
If you're installing a fixed panel system at this location, tilting your panels at an angle of 6 degrees towards the South would give you the most energy over the course of a year.
However, there could be local factors that might affect how much solar power you can generate here. For example, Ratnapura is known for its gem mining industry which could potentially produce dust and debris that might block sunlight from reaching your panels if not properly managed.
The weather might also play a part as Ratnapura experiences two monsoon seasons with heavy rainfall which may reduce solar production during those periods due to cloud cover or even damage panels if they are not properly protected.
To mitigate these issues and ensure greater energy production from your solar installation:
1) Regularly clean and maintain your panels to remove any dust or debris.
2) Install durable protective covers for your panels to shield them from heavy rain during monsoon seasons.
3) Consider using tracking systems that adjust the position of your panels throughout the day to maximize their exposure to sunlight.
4) If possible choose an installation site away from mining activities or other sources of potential pollution.
So overall while there are some challenges associated with generating solar power in Ratnapura due to environmental factors like dust and weather conditions like rain during monsoons; with proper planning and precautions it's still an effective place to generate solar energy year-round.
Note: The Tropics are located between 23.5° North and -23.5° South of the equator.
So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 109 locations across Sri Lanka. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.
Link: Solar PV potential in Sri Lanka by location
Solar output per kW of installed solar PV by season in Ratnapura
Seasonal solar PV output for Latitude: 6.6808, Longitude: 80.3965 (Ratnapura, Sri Lanka), 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 6° South in Ratnapura, Sri Lanka
To maximize your solar PV system's energy output in Ratnapura, Sri Lanka (Lat/Long 6.6808, 80.3965) throughout the year, you should tilt your panels at an angle of 6° South 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 Ratnapura, Sri Lanka
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 Ratnapura, Sri Lanka. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 6° South tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 10° North in Summer | 12° South in Autumn | 22° South in Winter | 1° South 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 Ratnapura, Sri Lanka
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 Ratnapura, Sri Lanka.
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 Ratnapura, Sri Lanka
Ratnapura, Sri Lanka is located in a valley surrounded by large hills and mountains. The region is characterized by a tropical rainforest climate with heavy rainfall throughout the year. The landscape is largely covered with forests, plantations (particularly tea and rubber), and paddy fields.
As for solar PV installations, flat or gently sloping lands are typically the most suitable. Given Ratnapura's topography, large scale solar PV might be challenging due to the hilly terrain and high levels of rainfall. However, there are still potential areas that could be considered:
1) Unused or less productive parts of plantations: These areas could potentially be converted into solar farms if they are relatively flat and receive sufficient sunlight.
2) Rooftops in urban or suburban areas: This includes both residential and commercial buildings. These can accommodate smaller-scale installations which collectively can contribute significantly to power generation.
3) Floating Solar Panels on reservoirs or lakes: Sri Lanka has many reservoirs that can potentially host floating solar panels without occupying valuable land resources.
Still, it's important to note that any potential site would need a detailed analysis considering factors such as sun exposure, cloud cover frequency, land use restrictions among others before deciding on its suitability for large scale solar PV installation.
Sri Lanka solar PV Stats as a country
Sri Lanka ranks 55th in the world for cumulative solar PV capacity, with 434 total MW's of solar PV installed. Each year Sri Lanka is generating 20 Watts from solar PV per capita (Sri Lanka ranks 66th in the world for solar PV Watts generated per capita). [source]
Are there incentives for businesses to install solar in Sri Lanka?
Yes, there are incentives for businesses wanting to install solar energy in Sri Lanka. The government of Sri Lanka has implemented a number of policies and programs to promote the use of renewable energy sources such as solar power. These include tax exemptions, subsidies, and other financial incentives for businesses that install solar systems. Additionally, the government has set up a Renewable Energy Fund which provides grants to support research and development activities related to renewable energy technologies.
Do you have more up to date information than this on incentives towards solar PV projects in Sri Lanka? 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: Monday 19th of February 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.
