Jeju City, South Korea, located at 33.4504° N, 126.558° E in the Northern Sub-Tropics, offers moderate potential for solar PV energy generation throughout the year, with significant seasonal variations.

Seasonal Solar Production

Solar energy production in Jeju City shows distinct patterns across seasons. Spring yields the highest output at 5.53 kWh per day for each kW of installed capacity, closely followed by summer with 5.47 kWh/day. Production drops considerably in autumn to 3.84 kWh/day, with winter showing the lowest generation at 2.75 kWh/day per kW installed.

This seasonal pattern makes spring and summer the ideal periods for solar energy generation, with production nearly twice as efficient compared to winter months. The significant drop in winter indicates that supplementary energy sources would be beneficial during this season.

Optimal Installation Parameters

For fixed solar panel installations in Jeju City, the ideal tilt angle to maximize year-round production is 29 degrees facing South. This angle has been calculated to optimize energy capture throughout the year, accounting for the location's specific latitude and seasonal solar patterns.

Environmental Challenges

Several environmental factors could impact solar production in Jeju City:

• Typhoons and strong seasonal storms, common in this region, pose risks to solar installations and may require more robust mounting systems
• High humidity levels, especially during summer monsoon season, can reduce panel efficiency and accelerate degradation of components
• Salt spray from the surrounding ocean can corrode equipment, particularly at coastal installation sites
• Volcanic dust from Mount Hallasan may accumulate on panels, reducing efficiency if not regularly cleaned

Preventative Measures

To mitigate these environmental challenges, several preventative measures are recommended:

Installing corrosion-resistant components and protective coatings can counter the effects of salt spray and humidity. Typhoon-resistant mounting systems with reinforced frames and foundations should be standard for this region. Regular maintenance including cleaning schedules to remove salt deposits and volcanic dust will help maintain optimal efficiency.

Automated cleaning systems or hydrophobic coatings on panels can reduce maintenance requirements and improve performance during humid periods. Additionally, installing wind breaks at strategic locations can help protect installations from the strongest seasonal winds.

Note: The Northern Sub Tropics extend from 23.5° latitude North up to 35° latitude.

So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 124 locations across South Korea. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in South Korea by location

Solar output per kW of installed solar PV by season in Jeju City

Seasonal solar PV output for Latitude: 33.4504, Longitude: 126.558 (Jeju City, South Korea), 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 29° South in Jeju City, South Korea

To maximize your solar PV system's energy output in Jeju City, South Korea (Lat/Long 33.4504, 126.558) throughout the year, you should tilt your panels at an angle of 29° 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 Jeju City, South Korea

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 Jeju City, South Korea. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 29° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
17° South in Summer	39° South in Autumn	48° South in Winter	26° 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 Jeju City, South Korea

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 Jeju City, South Korea.

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 Jeju City, South Korea

Jeju City is located on the northern coast of Jeju Island, the largest island off the Korean Peninsula. The city sits at the foot of Hallasan (Mount Halla), a dormant volcano that forms the center of the island and rises to 1,950 meters above sea level. This distinctive topographical feature dominates the landscape of Jeju Island, creating a gentle slope that descends from the central mountain toward the coastal areas where Jeju City is situated. The terrain around Jeju City is characterized by a gradual incline from the coastal plains toward the interior. The immediate vicinity of the city is relatively flat to gently rolling, making it suitable for urban development. As one moves south from the city toward Mount Halla, the elevation increases progressively, forming a series of plateaus and undulating hills. These hills are often composed of volcanic rock and soil, remnants of the island's volcanic origins.

Volcanic Formations

The topography of the region bears clear evidence of its volcanic history. Numerous parasitic cones, locally known as "oreum," dot the landscape around Jeju City. These secondary volcanic formations create small hills and elevations throughout the northern region of the island. Additionally, lava tubes and caves can be found in the area, formed by ancient lava flows that cooled and solidified on the outside while the interior lava continued to flow, leaving hollow tunnels. The coastline near Jeju City features a mix of sandy beaches and rocky shores formed by solidified lava flows that reached the sea. These distinctive coastal formations contribute to the unique landscape of the area.

Potential for Solar PV Development

For large-scale solar photovoltaic (PV) development, several areas near Jeju City present favorable conditions. The gently sloping terrain to the south and southeast of the city offers good potential for solar installations. These areas benefit from reduced urbanization compared to the city center while maintaining relatively flat or moderately inclined surfaces that are ideal for solar panel arrays. The northwestern coastal plains, extending from Jeju City toward Hallim, provide another promising region for solar development. This area features extensive flatlands with minimal shading from topographical features. The open terrain allows for unobstructed solar exposure throughout the day. Areas to avoid would include the steeper slopes of Mount Halla to the south, where installation would be technically challenging and potentially disruptive to the island's ecological systems. The eastern regions toward Seongsan, while suitable in terms of topography, contain valuable agricultural land and cultural sites that might make large-scale solar development less appropriate.

Topographical Considerations for Solar Development

When considering specific sites for solar PV installations near Jeju City, developers should note that the northern coastal areas offer the advantage of flat terrain but may face space constraints due to urban development and higher land costs. The mid-elevation regions to the south of the city provide more available land with good solar exposure, though installation on sloping terrain would require additional engineering considerations. The volcanic soil composition throughout the region generally provides solid foundation conditions for solar infrastructure, though areas with extensive lava tube systems beneath would require careful assessment to ensure structural stability. The island's exposure to seasonal typhoons also necessitates robust mounting systems for any solar installation, regardless of the specific topographical location. Wind patterns influenced by Mount Halla and the surrounding ocean should be factored into the structural design of solar arrays throughout the region.

South Korea solar PV Stats as a country

South Korea ranks 8th in the world for cumulative solar PV capacity, with 18,161 total MW's of solar PV installed. This means that 3.80% of South Korea's total energy as a country comes from solar PV (that's 21st in the world). Each year South Korea is generating 350 Watts from solar PV per capita (South Korea ranks 9th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in South Korea?

Yes, there are incentives for businesses wanting to install solar energy in South Korea. The Korean government offers a variety of financial incentives and subsidies for businesses that install solar energy systems. These include tax credits, grants, loans, and other forms of support. Additionally, the government has implemented a feed-in tariff system which guarantees a fixed price for electricity generated from renewable sources such as solar power. This helps to make the installation of solar energy systems more attractive to businesses by providing them with a guaranteed return on their investment.

Do you have more up to date information than this on incentives towards solar PV projects in South Korea? 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.