Solar PV Analysis of Vavuniya, Sri Lanka
Vavuniya, Sri Lanka is in a very good location for generating solar energy all year round. This is because it's located in the Tropics where sunlight is consistent throughout most of the year. The amount of electricity you can expect to generate from each kilowatt (kW) of installed solar panels varies slightly by season:
- In Summer, you can expect about 6.18 kilowatt-hours (kWh) per day
- In Autumn, about 5.26 kWh/day
- In Winter, about 5.44 kWh/day
- And in Spring, about 6.32 kWh/day
This means that while there are some variations across seasons, overall you can still produce a decent amount of electricity at any time during the year.
The best times to generate solar power at this location would be during Spring and Summer when sunlight hours and intensity are at their highest.
For fixed panel installations here, tilting your panels at an angle of 7 degrees towards the South will help maximize your total yearly production from your solar PV system.
However, there might be local factors that could affect how much power you're able to generate from your solar installation:
1) Weather conditions - While Vavuniya generally has plenty sunshine throughout the year which is great for producing solar energy; during monsoon seasons there could be prolonged periods with little or no sun which would reduce output from your panels.
Preventative measures: You may want to consider having a backup battery storage system or alternative source of power for these periods when sunshine may not be as abundant.
2) Dust and dirt accumulation on panels – Dust storms or just general dust accumulation over time could cover your panels reducing their efficiency.
Preventative measures: Regular cleaning and maintenance routines should help keep them running optimally.
3) Shading - Any shading caused by nearby buildings or trees could also impact how much sunlight your panels receive.
Preventative measures: Try to install your panels in a location where they'll get the most sun exposure throughout the day and won't be shaded by nearby structures or trees.
In conclusion, while there are some factors that could impact solar production at Vavuniya, with careful planning and regular maintenance you should still be able to generate a substantial amount of electricity from solar PV all 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 Vavuniya
Seasonal solar PV output for Latitude: 8.7542029, Longitude: 80.4982402 (Vavuniya, 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 7° South in Vavuniya, Sri Lanka
To maximize your solar PV system's energy output in Vavuniya, Sri Lanka (Lat/Long 8.7542029, 80.4982402) throughout the year, you should tilt your panels at an angle of 7° 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 Vavuniya, 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 Vavuniya, Sri Lanka. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 7° South tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 7° North in Summer | 14° South in Autumn | 24° South in Winter | 2° 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 Vavuniya, 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 Vavuniya, 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 Vavuniya, Sri Lanka
Vavuniya, Sri Lanka is located in the northern region of the country. The topography around Vavuniya is relatively flat with some small hills and undulating terrain. This area is characterized by dry zone lowland forests, scrublands, grasslands and agricultural lands.
For large-scale solar PV installations, areas with high levels of sunlight throughout the year and flat or gently sloping terrains are ideal. Given Vavuniya's position near to equator it receives a significant amount of sunlight throughout the year making it a good location for solar power generation.
The vast expanses of open land including grasslands and agricultural lands around Vavuniya would be well-suited for large-scale solar PV projects as they provide ample space for installation without obstruction to sunlight. However, any plan should consider potential impacts on local agriculture or ecosystems.
Furthermore, these installations can also be set up on rooftops within the city itself which would help save land resources while providing clean energy. It's important that any such project takes into account local regulations and community needs before implementation.
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: Thursday 13th of June 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.
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