Solar PV Analysis of Galle, Sri Lanka
Galle, Southern Province, Sri Lanka is a pretty good place for solar energy production year-round. This is due to its location in the tropics where sunlight remains consistent throughout most of the year. The city experiences more wet and dry seasons rather than drastic seasonal changes.
The energy output varies slightly with each season but not by much. In summer, you can expect about 5.47 kilowatt-hours (kWh) of electricity per day for every kilowatt (kW) of installed solar panels; in autumn it's 4.94 kWh/day; in winter it goes up to 5.60 kWh/day; and spring sees the highest output at 5.93 kWh/day.
To get the most out of your solar panels all-year round, they should be tilted at an angle that faces 5 degrees South if they are fixed installations - this means they'll catch as much sunlight as possible over the course of a day.
However, there could be some local factors that might affect how well your solar panels work here:
1) Weather: Galle has a tropical rainforest climate which means it gets quite a bit of rain throughout the year, especially from April to June and September to November (the two monsoon seasons). When it's cloudy or rainy, less sunlight reaches the solar panels which reduces their power output.
2) Dust and Dirt: Dust particles or dirt can accumulate on solar panel surfaces over time which may reduce their efficiency by blocking sunlight.
Preventative measures include:
1) Regular Cleaning: Keeping your panels clean ensures maximum exposure to sunlight so regular cleaning is important especially during drier periods when dust accumulation may occur.
2) Weather-Resistant Panels: When installing your system consider using weather-resistant or waterproof materials since Galle does receive significant rainfall annually.
3) Backup Power Source: Given unpredictable weather patterns having a backup source like batteries or generators would ensure continuous power supply even during periods of lower solar output.
In conclusion, Galle is a suitable location for solar energy production but like any other place, it comes with its own set of challenges that can be managed with some planning and maintenance.
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 Galle
Seasonal solar PV output for Latitude: 6.0336, Longitude: 80.2197 (Galle, 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 5° South in Galle, Sri Lanka
To maximize your solar PV system's energy output in Galle, Sri Lanka (Lat/Long 6.0336, 80.2197) throughout the year, you should tilt your panels at an angle of 5° 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 Galle, 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 Galle, Sri Lanka. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 5° 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 | 21° South in Winter | 0° 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 Galle, 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 Galle, 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 Galle, Sri Lanka
Galle, Sri Lanka is located on the southwestern tip of Sri Lanka and largely features a coastal topography. The city is surrounded by the Indian Ocean on one side, while inland areas are characterized by flat or gently sloping terrain interspersed with small hills.
For large-scale solar PV installations, you need areas that have high levels of sunlight (solar irradiance), relatively flat terrain for easy installation and maintenance, and proximity to power grids for easy distribution.
Given these requirements, the following nearby areas could be suitable:
1. Flat Inland Areas: There are several open and flat regions in the vicinity of Galle that may be suited for large-scale solar PV projects. These include agricultural lands that are not under intensive cultivation.
2. Coastal Regions: While coastal regions can be exposed to salt mist which can affect solar panel efficiency over time, they also tend to have good sun exposure. With proper maintenance procedures in place to manage corrosive effects from sea air, these locations could potentially host large-scale solar farms.
3. Rooftops in Urban Areas: Another option would be installing rooftop solar panels across buildings in urbanized parts of Galle city itself - this would save land space while contributing significantly towards green energy generation.
It's important to note that any potential site must undergo detailed feasibility studies including technical aspects such as shading analysis and grid connectivity assessment; environmental impacts; social implications; as well as financial viability before proceeding with development.
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 18th of April 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.
