San Juan, Philippines, located in the tropics at latitude 9.1573 and longitude 123.4902, offers a favorable environment for solar energy generation throughout the year. The consistent sunlight and distinct wet and dry seasons characteristic of tropical climates contribute to the location's potential for solar power production.

Seasonal Solar Performance

The solar energy output at this location varies across the meteorological seasons. Spring stands out as the most productive period, with an average daily output of 6.09 kWh per kW of installed solar capacity. Summer follows closely, generating 5.82 kWh/day, while autumn and winter show slightly lower but still significant outputs of 5.13 kWh/day and 4.63 kWh/day, respectively.

Optimal Panel Positioning

For fixed solar panel installations in San Juan, the ideal tilt angle to maximize year-round energy production is 8 degrees facing South. This angle has been calculated taking into account the location's latitude, daily solar elevation angles, and NASA's solar irradiance data, ensuring optimal exposure to sunlight throughout the year.

Environmental Considerations

While San Juan'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. 2. Heavy rainfall: The wet season may lead to reduced solar output due to cloud cover and precipitation. To mitigate these risks, solar installations should incorporate: - Sturdy mounting systems designed to withstand high winds - Waterproof components and proper drainage to handle heavy rainfall - Regular maintenance to ensure optimal performance and longevity of the system

Conclusion

Overall, San Juan, Philippines presents an ideal location for year-round solar energy generation. The consistent sunlight and relatively high solar output across all seasons make it a promising site for solar PV installations. By taking appropriate measures to address potential environmental challenges, solar energy systems in this location can provide a reliable and sustainable source of power throughout the year.

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 San Juan, Central Visayas

Seasonal solar PV output for Latitude: 9.1573, Longitude: 123.4902 (San Juan, Central Visayas, 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 8° South in San Juan, Central Visayas, Philippines

To maximize your solar PV system's energy output in San Juan, Central Visayas, Philippines (Lat/Long 9.1573, 123.4902) throughout the year, you should tilt your panels at an angle of 8° 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 San Juan, Central Visayas, 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 San Juan, Central Visayas, Philippines. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 8° 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	15° South in Autumn	24° South in Winter	3° 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 San Juan, Central Visayas, 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 San Juan, Central Visayas, 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 San Juan, Central Visayas, Philippines

The topography around San Juan, Philippines, located at 9.1573 latitude and 123.4902 longitude, is characterized by a diverse landscape that includes both coastal and inland features. This area, situated on the island of Siquijor in the Visayas region, is known for its varied terrain that transitions from coastal plains to rolling hills and mountainous regions. Along the coastline, San Juan boasts stretches of sandy beaches and rocky shorelines. These areas gradually rise into gently sloping coastal plains, which extend inland for a short distance. As one moves further from the coast, the terrain becomes more undulating, with low hills and valleys creating a picturesque landscape.

Inland Topography

Moving inland, the topography becomes more pronounced, with higher elevations and steeper slopes. The central part of Siquijor Island, where San Juan is located, features a hilly to mountainous interior. These elevated areas are often covered in lush vegetation, including forests and agricultural lands. The highest point on Siquijor Island, Mount Bandilaan, reaches an elevation of approximately 628 meters (2,060 feet) above sea level. While not directly in San Juan, this peak influences the overall topography of the surrounding areas, creating a varied landscape with ridges, valleys, and plateaus.

Suitability 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 favorable topography with practical considerations for solar energy production. The gently sloping coastal plains near San Juan offer potential for solar PV development. These areas typically have good sun exposure and relatively flat terrain, which simplifies installation and maintenance of solar panels. However, proximity to the coast means considering potential impacts from salt spray and tropical storms. Inland areas with moderate elevation, such as rolling hills or plateaus, could also be suitable for large-scale solar PV projects. These locations often benefit from reduced vegetation and obstacles that could cast shadows on solar panels. Additionally, slightly elevated areas may experience less fog and cloud cover compared to lowland regions, potentially increasing solar energy yield. It's important to note that while the mountainous interior of Siquijor Island offers some flat areas that could accommodate solar installations, the challenges of access and grid connection in these remote locations may make them less practical for large-scale projects. Ultimately, the most suitable areas for solar PV near San Juan would likely be a compromise between optimal solar conditions and practical considerations such as land availability, grid access, and environmental impact. A detailed site-specific assessment would be necessary to determine the best locations for such projects in this topographically diverse region.

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.