Solar PV Analysis of Iloilo City, Philippines
Iloilo City, Western Visayas, Philippines (latitude: 10.7019, longitude: 122.5622) is a highly suitable location for solar PV power generation due to the abundant sunlight it receives throughout most of the year. The average daily energy production per kW of installed solar in each season is as follows: 5.62 kWh in Summer, 5.16 kWh in Autumn, 4.93 kWh in Winter, and 6.45 kWh in Spring, with Spring yielding the highest energy output.
Located within the Tropics, Iloilo City experiences wet and dry periods rather than significant temperature fluctuations like those seen in other regions during their winter and summer seasons. As such, this area enjoys consistent sunshine all year round which greatly benefits solar power generation.
However, heavy rain or cloud cover could temporarily reduce solar energy production at this location; these conditions are not frequent enough to substantially impact overall output from a well-designed system over time though. To ensure optimal performance of a solar installation here despite potential environmental challenges such as flooding or damage from extreme weather events like typhoons or storms, it is essential to use equipment that is designed to withstand these conditions and protect against any related damage.
For fixed panel installations at this location without tracking systems involved , the ideal tilt angle for maximizing energy production would be approximately 10 degrees South-facing panels . This orientation will help ensure that panels capture as much sunlight as possible throughout different times of day and across various seasons .
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 Iloilo City
Seasonal solar PV output for Latitude: 10.7019, Longitude: 122.5622 (Iloilo City, 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 10° South in Iloilo City, Philippines
To maximize your solar PV system's energy output in Iloilo City, Philippines (Lat/Long 10.7019, 122.5622) throughout the year, you should tilt your panels at an angle of 10° 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 Iloilo City, 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 Iloilo City, Philippines. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 10° South tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 5° North in Summer | 17° South in Autumn | 26° South in Winter | 4° 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 Iloilo City, 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 Iloilo City, 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 Iloilo City, Philippines
Iloilo City is located on the southeastern coast of Panay Island in the western Visayas region of the Philippines. The topography around Iloilo City is generally flat with gently rolling hills and low mountains, although there are some areas of steep terrain near the city center. The nearby area is mostly agricultural land with some small towns and villages scattered throughout.
The most suitable areas for large-scale solar PV installations around Iloilo City would be those that are relatively flat and have access to direct sunlight for most of the day. Areas such as open fields or abandoned agricultural lands would be ideal, as they provide ample space for large arrays without obstructions from buildings or trees. Additionally, any locations that are close to existing power lines would make installation easier and more cost effective.
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: Wednesday 31st of May 2023
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.
