Surallah, Soccsksargen, Philippines, located at 6.3752° N, 124.7367° E, offers a promising environment for solar energy generation throughout the year. This tropical location benefits from consistent sunlight, with seasons primarily distinguished by wet and dry periods rather than significant temperature variations.
Year-round Solar Potential
The solar energy output in Surallah remains relatively stable across all seasons. Spring sees the highest production at 5.83 kWh per day for each kilowatt of installed solar capacity. Summer follows closely with 5.73 kWh/day, while autumn and winter show slightly lower but still substantial outputs of 5.40 kWh/day and 5.03 kWh/day, respectively. This consistent performance throughout the year makes Surallah an ideal location for solar PV installations. The minimal fluctuation between seasons ensures a reliable energy supply, with only a small dip during the winter months.Optimal Panel Tilt
For fixed solar panel installations in Surallah, Soccsksargen, the ideal tilt angle to maximize year-round energy production is 5 degrees facing South. This slight tilt helps optimize the panels' exposure to sunlight throughout the year, taking into account the location's proximity to the equator and the sun's path across the sky.Environmental Considerations
While Surallah's tropical climate is generally favorable for solar energy production, there are some environmental factors to consider: 1. Rainfall: The region experiences a wet season, which could temporarily reduce solar output due to cloud cover. 2. Humidity: High humidity levels may lead to condensation on panels, potentially affecting their efficiency. To mitigate these issues, installers should consider: - Using high-quality, weather-resistant panels - Implementing proper drainage systems to prevent water accumulation - Regular cleaning and maintenance to remove any dirt or residueConclusion
Overall, Surallah presents an excellent location for solar PV installations. Its consistent year-round sunlight and minimal seasonal variations in energy output make it highly suitable for solar energy production. With proper installation techniques and maintenance, the environmental factors can be effectively managed, ensuring optimal performance of solar PV systems in this tropical setting.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 268 locations across Philippines. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.
Link: Solar PV potential in Philippines by location
Solar output per kW of installed solar PV by season in Surallah
Seasonal solar PV output for Latitude: 6.3752, Longitude: 124.7367 (Surallah, Philippines), 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 Surallah, Philippines
To maximize your solar PV system's energy output in Surallah, Philippines (Lat/Long 6.3752, 124.7367) 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 Surallah, Philippines
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 Surallah, Philippines. 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 | 22° 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 Surallah, Philippines
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 Surallah, Philippines.
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 Surallah, Philippines
The topography around Surallah, Philippines, is characterized by a diverse landscape that includes both lowland plains and rolling hills. Situated in the province of South Cotabato on the island of Mindanao, Surallah is nestled within a region known for its agricultural productivity and natural beauty. The immediate vicinity of Surallah features relatively flat terrain, with expansive rice fields and other agricultural lands dominating the landscape. This area is part of the larger Allah Valley, a fertile plain that stretches across several municipalities. The flat topography of the valley floor gradually gives way to gently undulating terrain as one moves away from the town center. To the east and northeast of Surallah, the land begins to rise more noticeably, transitioning into foothills that eventually lead to the higher elevations of the Daguma Mountain Range. These hills are often covered in a mix of forest and agricultural plantations, creating a patchwork of green hues across the landscape.
Potential for Large-Scale Solar PV
When considering areas nearby that would be most suited to large-scale solar photovoltaic (PV) installations, several factors come into play. The ideal locations would combine flat or gently sloping terrain with high solar irradiance and minimal shading from surrounding features. The expansive agricultural plains surrounding Surallah offer promising potential for solar PV development. These areas benefit from their flat topography, which simplifies construction and reduces costs associated with land preparation. The open fields also receive ample sunlight throughout the day, maximizing energy generation potential. Specifically, the areas to the west and southwest of Surallah, where the Allah Valley stretches out, present some of the best opportunities for large-scale solar installations. These locations combine favorable topography with excellent solar exposure, making them prime candidates for PV projects. While the hilly regions to the east may seem less suitable due to their more varied terrain, some of the gentler slopes could still be considered for solar development. These areas might require more careful site selection and planning but could potentially offer the advantage of elevated positions with reduced risk of flooding and good air circulation, which can help maintain optimal operating temperatures for solar panels. It's important to note that any large-scale solar PV project would need to carefully balance energy production goals with the region's agricultural importance. Proper planning and community engagement would be crucial to ensure that solar development complements rather than competes with existing land uses in this agriculturally rich area.Philippines solar PV Stats as a country
Philippines ranks 40th in the world for cumulative solar PV capacity, with 1,370 total MW's of solar PV installed. Each year Philippines is generating 13 Watts from solar PV per capita (Philippines ranks 71st in the world for solar PV Watts generated per capita). [source]
Are there incentives for businesses to install solar in Philippines?
Yes, there are several incentives for businesses wanting to install solar energy in the Philippines. These include:
1. The Feed-in Tariff (FiT) program, which provides a guaranteed rate of return on investments in renewable energy projects;
2. Tax credits and exemptions from certain taxes;
3. Net metering programs that allow businesses to sell excess electricity back to the grid;
4. Grants and loans from government agencies such as the Department of Energy and the Philippine Solar Power Alliance;
5. Technical assistance from organizations like USAID’s Clean Energy Program; and
6. Access to financing through banks, venture capital firms, or other sources of private capital.
Do you have more up to date information than this on incentives towards solar PV projects in Philippines? Please reach out to us and help us keep this information current. Thanks!
Citation Guide
Article Details for Citation
Author: Aaron Robinson
Publisher: profileSOLAR.com
First Published: Saturday 22nd of March 2025
Last Updated: Monday 21st of July 2025
Tell Us About Your Work
We love seeing how our research helps others! If you've cited this article in your work, we'd be delighted to hear about it. Drop us a line via our Contact Us page or on X, to share where you've used our information - we may feature a link to your work on our site. This helps create a network of valuable resources for others in the solar energy community and helps us understand how our research is contributing to the field. Plus, we occasionally highlight exceptional works that reference our research on our social media channels.
Feeling generous?
Share this with your friends!

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.




