Roxas City, Western Visayas, Philippines, situated at 11.5818° N, 122.7514° E, offers a promising location for solar energy generation throughout the year. This tropical city experiences consistent sunlight and is characterized by wet and dry seasons rather than traditional four-season cycles.

Seasonal Solar Performance

Solar panel performance in Roxas City varies across the meteorological seasons: Spring sees the highest energy output at 6.13 kWh per day for each kilowatt of installed solar capacity. Summer follows with 5.49 kWh/day, then Autumn with 4.84 kWh/day. Winter, while still productive, has the lowest output at 4.22 kWh/day. These figures indicate that Roxas City maintains good solar potential year-round, with spring and summer being particularly favorable for energy generation.

Optimal Panel Positioning

For fixed solar panel installations in Roxas City, Western Visayas, the ideal tilt angle to maximize year-round energy production is 10 degrees facing South. This angle has been calculated taking into account the city's latitude, daily solar elevation angles, and NASA's solar irradiance data.

Environmental Considerations

While Roxas City's tropical climate is generally conducive to solar energy production, there are some environmental factors to consider: 1. Typhoons: The Philippines is prone to tropical cyclones, which can potentially damage solar installations. To mitigate this risk, it's crucial to use high-quality, weather-resistant panels and robust mounting systems designed to withstand strong winds. 2. Heavy rainfall: During the wet season, frequent rain might reduce solar efficiency. Installing panels at the optimal angle helps with water runoff and self-cleaning. Additionally, regular maintenance and cleaning can prevent buildup of dirt and debris. 3. High humidity: The tropical climate's humidity can potentially affect the longevity of solar equipment. Using corrosion-resistant materials and ensuring proper sealing of electrical components can help protect against moisture-related issues. By addressing these factors during installation and maintenance, solar energy systems in Roxas City can operate efficiently and reliably, taking full advantage of the location's favorable solar conditions.

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 Roxas City

Seasonal solar PV output for Latitude: 11.5818, Longitude: 122.7514 (Roxas 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 Roxas City, Philippines

To maximize your solar PV system's energy output in Roxas City, Philippines (Lat/Long 11.5818, 122.7514) 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 Roxas 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 Roxas 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
4° North in Summer	18° South in Autumn	27° South in Winter	5° 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 Roxas 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 Roxas City, Philippines.

Our calculation method

1. Solar Position:
   We determine the Sun's position on the Winter solstice using the location's latitude and solar declination.
2. Shadow Projection:
   We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle.
3. 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 Roxas City, Philippines

The topography around Roxas City, Philippines, is characterized by a diverse landscape that includes coastal plains, rolling hills, and low-lying mountains. Situated on the northern coast of Panay Island, Roxas City is nestled in a relatively flat area that gradually rises as one moves inland. The city itself is built on a coastal plain, with the Panay River flowing through its heart before emptying into the Sibuyan Sea. As you move away from the coast, the terrain becomes more varied. To the south and southeast of Roxas City, the land begins to undulate, forming gentle hills and valleys. These areas are predominantly used for agriculture, with rice paddies and coconut plantations being common sights. Further inland, the elevation increases more dramatically, giving way to the foothills of the central Panay mountain range. The coastline near Roxas City features a mix of sandy beaches and mangrove forests, which provide natural protection against coastal erosion and serve as important ecosystems for local wildlife. Several small islands and islets dot the nearby waters, adding to the area's picturesque scenery.

Potential Areas for Large-scale Solar PV

When considering locations for large-scale solar photovoltaic (PV) installations near Roxas City, several factors come into play, including available land, sunlight exposure, and proximity to existing infrastructure. Based on the topography of the region, a few areas stand out as potentially suitable: The gently rolling hills to the south and southeast of Roxas City offer promising locations for solar PV farms. These areas typically receive ample sunlight throughout the year and have enough open space to accommodate large installations. The slight elevation can also help reduce the risk of flooding, which is an important consideration in this tropical climate. Some of the flatter agricultural lands surrounding the city might also be suitable, particularly those that are less productive or have been left fallow. These areas are often already cleared and have good access to roads, making them easier to develop for solar energy production. The coastal plains, while generally flat and accessible, may be less ideal due to the potential for sea-level rise and storm surges. However, some portions of these areas that are set back from the immediate coastline could still be considered, especially if they are not prime agricultural land. It's important to note that any large-scale solar PV project would need to carefully balance energy production goals with environmental conservation and local land use needs. Proper environmental impact assessments and community consultations would be crucial to ensure that such developments are sustainable and beneficial to the region as a whole.

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!

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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.