Solar PV Analysis of Phu Quoc, Vietnam
Phu Quoc, Kiên Giang Province, Vietnam presents a highly favorable location for year-round solar photovoltaic energy generation. Located in the tropical zone at coordinates 10.2159°N, 103.9664°E, this island destination benefits from consistent sunlight throughout most of the year, with seasonal variations characterized more by wet and dry periods rather than dramatic temperature changes.
Solar Energy Production Performance
The solar energy output data for Phu Quoc demonstrates excellent year-round potential, with seasonal variations that actually favor the cooler months. During summer months, solar panels can be expected to generate 4.92 kWh per day per kW of installed capacity. Autumn shows similar performance at 4.87 kWh per day per kW.
The most productive periods occur during winter and spring, when panels can generate 5.73 kWh and 5.94 kWh per day per kW respectively. This higher output during cooler months is typical for tropical locations, as solar panels operate more efficiently at lower temperatures despite the region's consistently high solar irradiance.
For optimal year-round energy production, fixed solar panel installations at this location should be tilted at 10 degrees facing south. This angle has been calculated to maximize total annual solar output by accounting for the sun's varying elevation angles throughout the year and weighting these against actual solar irradiance data.
Environmental and Weather Challenges
Several significant environmental factors in Phu Quoc can impact solar energy production and require careful consideration during installation planning.
The tropical monsoon climate brings intense seasonal rainfall, particularly during the wet season from May through October. Heavy rains can reduce solar output temporarily, but more importantly, the high humidity and frequent precipitation create ideal conditions for rapid accumulation of dirt, dust, and organic matter on solar panels.
Salt air exposure presents another major challenge, as Phu Quoc is an island location surrounded by ocean. The marine environment means solar installations face constant exposure to salt-laden air, which can accelerate corrosion of metal components and degrade electrical connections over time.
Strong tropical storms and typhoons occasionally affect the region, bringing high winds that can damage improperly secured solar installations. The combination of intense rainfall and strong winds during storm events poses risks to both the structural integrity and electrical safety of solar systems.
Preventative Installation Measures
To maximize energy production and system longevity in Phu Quoc's challenging environment, several preventative measures should be implemented during installation:
- Use marine-grade aluminum frames and stainless steel mounting hardware specifically designed to resist salt corrosion
- Apply anti-corrosive coatings to all metal components and ensure all electrical connections use waterproof, UV-resistant materials
- Install panels with adequate spacing to promote air circulation and faster drying after rain events
- Design mounting systems to withstand high wind loads, using reinforced foundations and secure anchoring appropriate for local building codes
- Implement regular cleaning schedules to remove salt deposits, organic growth, and accumulated debris that can significantly reduce panel efficiency
Proper drainage around installations is essential to prevent water pooling, which can lead to electrical issues and provide breeding grounds for algae or moss growth. Additionally, choosing solar panels with robust anti-reflective coatings and tempered glass can help maintain performance despite the harsh tropical conditions.
With appropriate installation techniques and regular maintenance, Phu Quoc's excellent solar resource can be effectively harnessed year-round, making it an ideal location for solar energy projects despite the environmental challenges.
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 160 locations across Vietnam. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.
Link: Solar PV potential in Vietnam by location
Solar output per kW of installed solar PV by season in Phu Quoc
Seasonal solar PV output for Latitude: 10.2159, Longitude: 103.9664 (Phu Quoc, Vietnam), 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 Phu Quoc, Vietnam
To maximize your solar PV system's energy output in Phu Quoc, Vietnam (Lat/Long 10.2159, 103.9664) 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 Phu Quoc, Vietnam
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 Phu Quoc, Vietnam. 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 |
|---|---|---|---|
| 6° 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 Phu Quoc, Vietnam
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 Phu Quoc, Vietnam.
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 Phu Quoc, Vietnam
Topography of Phu Quoc and Surrounding Region
Phu Quoc Island sits in the Gulf of Thailand, approximately 45 kilometers off the coast of mainland Vietnam near the Cambodian border. The island itself features a diverse topographical landscape characterized by rolling hills, coastal plains, and mountainous terrain in the interior regions. The highest peak on the island reaches approximately 600 meters above sea level, with most of the elevated terrain concentrated in the northern and central portions of the island.
The coastal areas of Phu Quoc are predominantly flat to gently undulating, with extensive sandy beaches and coastal plains that extend inland for several kilometers in many locations. These low-lying areas are interspersed with small hills and ridges, creating a varied but generally accessible terrain. The southern portion of the island tends to be flatter overall, with broader expanses of relatively level ground.
Moving inland from the immediate coastal zone, the topography becomes more complex, with a series of hills and valleys covered primarily by tropical forest and agricultural land. The central spine of the island features more pronounced elevation changes, though these are generally gradual rather than steep or dramatic. Stream valleys and small watersheds create natural drainage patterns throughout the interior, contributing to the overall undulating character of the landscape.
Areas Most Suitable for Large-Scale Solar Development
The most promising areas for large-scale solar photovoltaic installations around Phu Quoc would be the extensive coastal plains and gently rolling terrain found primarily in the southern and eastern portions of the island. These areas offer the combination of relatively flat topography, good accessibility, and sufficient open space required for major solar developments. The coastal plains provide natural advantages including minimal grading requirements and easier construction access.
The agricultural areas in the flatter interior regions also present excellent opportunities for solar development, particularly where the terrain remains relatively level and free from significant vegetation coverage. These zones typically offer good road access and are already partially cleared, reducing initial site preparation costs and environmental impact.
Areas to avoid for large-scale solar installations would include the steeper hillsides and heavily forested mountainous regions in the northern and central parts of the island. These locations present challenges including difficult access, significant grading requirements, and potential environmental concerns related to forest clearing. The stream valleys and areas prone to seasonal flooding would also be less suitable for major solar infrastructure.
The mainland coastal areas of southern Vietnam, visible from Phu Quoc, offer additional potential for large-scale solar development. These regions feature extensive flat to gently rolling terrain with good transportation links and electrical grid connectivity. The Mekong Delta region, while not immediately adjacent to Phu Quoc, represents some of the flattest and most accessible land in southern Vietnam, though seasonal flooding patterns would need careful consideration in project planning.
Vietnam solar PV Stats as a country
Vietnam ranks 9th in the world for cumulative solar PV capacity, with 16,660 total MW's of solar PV installed. Each year Vietnam is generating 171 Watts from solar PV per capita (Vietnam ranks 30th in the world for solar PV Watts generated per capita). [source]
Are there incentives for businesses to install solar in Vietnam?
Yes, there are several incentives for businesses wanting to install solar energy in Vietnam. The government has implemented a number of policies and programs to encourage the development of renewable energy sources, including solar energy. These include tax exemptions, preferential loans, and feed-in tariffs for electricity generated from solar power plants. Additionally, the government has established a Renewable Energy Development Fund to provide financial support for projects related to renewable energy sources such as solar power.
Do you have more up to date information than this on incentives towards solar PV projects in Vietnam? 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: Monday 30th of June 2025
Last Updated: Tuesday 5th of August 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.
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Calculate Your Optimal Solar Panel Tilt Angle: A Comprehensive Guide
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