Chai Wan, Eastern, located in the eastern part of Hong Kong Island, presents a promising location for solar energy generation throughout the year. Situated in the tropics, this area benefits from consistent sunlight and experiences seasons characterized more by wet and dry periods rather than significant temperature variations.

Seasonal Solar Production

The solar energy potential in Chai Wan varies slightly across seasons. Summer yields the highest output at 5.52 kWh per day for each kilowatt of installed solar capacity. Spring follows closely with 5.40 kWh/day, while autumn produces 4.91 kWh/day. Winter, although less productive, still generates a respectable 4.35 kWh/day. These figures indicate that Chai Wan maintains relatively high solar energy production throughout the year, with only a moderate dip during the winter months. The consistency in output makes this location well-suited for year-round solar energy generation.

Optimal Panel Installation

For fixed panel installations in Chai Wan, Eastern, the ideal tilt angle to maximize year-round solar production is 20 degrees facing south. This angle has been calculated taking into account the location's latitude, the sun's daily elevation angles, and the Earth's elliptical orbit.

Environmental Considerations

While Chai Wan offers favorable conditions for solar energy production, there are some environmental factors to consider: 1. Typhoons: Hong Kong experiences typhoons, typically between May and November. Strong winds and heavy rainfall associated with these events can potentially damage solar panels or reduce their efficiency. 2. Air pollution: Being part of a large urban area, Chai Wan may experience periods of increased air pollution, which can slightly reduce solar panel efficiency. To mitigate these factors, consider the following preventative measures: - Use high-quality, typhoon-resistant mounting systems for solar panels. - Install panels with a slight tilt to allow for natural cleaning by rainwater. - Regularly clean panels to remove air pollution residue. - Consider micro-inverters or power optimizers to minimize the impact of partial shading from pollution. By implementing these measures, solar installations in Chai Wan can maximize their energy production potential and withstand local 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 47 locations across Hong Kong. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in Hong Kong by location

Solar output per kW of installed solar PV by season in Chai Wan

Seasonal solar PV output for Latitude: 22.2678, Longitude: 114.238 (Chai Wan, Hong Kong), 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 20° South in Chai Wan, Hong Kong

To maximize your solar PV system's energy output in Chai Wan, Hong Kong (Lat/Long 22.2678, 114.238) throughout the year, you should tilt your panels at an angle of 20° 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 Chai Wan, Hong Kong

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 Chai Wan, Hong Kong. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 20° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
6° South in Summer	27° South in Autumn	37° South in Winter	15° 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 Chai Wan, Hong Kong

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 Chai Wan, Hong Kong.

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 Chai Wan, Hong Kong

Chai Wan, located on the eastern end of Hong Kong Island, is characterized by a diverse and interesting topography. The area is nestled between steep hills to the south and west, and the coastline of Victoria Harbour to the north. This unique geographical setting creates a striking contrast between urban development and natural landscapes. The southern part of Chai Wan is dominated by the rugged terrain of Mount Parker and Mount Collinson. These hills rise sharply from the urban areas, with elevations reaching over 300 meters above sea level. The slopes are generally steep and covered with dense vegetation, typical of Hong Kong's subtropical climate. These hillsides provide a scenic backdrop to the bustling city below and offer popular hiking trails for outdoor enthusiasts. To the north, Chai Wan's landscape flattens out as it approaches the coastline. This area has been extensively reclaimed and developed, creating a relatively level surface that accommodates residential buildings, industrial estates, and transportation infrastructure. The flat terrain here stands in stark contrast to the hilly southern regions.

Potential for Large-Scale Solar PV

When considering areas nearby Chai Wan for large-scale solar PV installations, several factors must be taken into account. The ideal location would have ample open space, minimal shading, and good sun exposure throughout the day. The most suitable areas for large-scale solar PV near Chai Wan would likely be found in the flatter, more open spaces to the north and east. The reclaimed land along the coastline, particularly in areas with fewer tall buildings, could potentially accommodate solar installations. Industrial rooftops in the Chai Wan Industrial City or similar complexes might also offer suitable spaces for solar panels. However, it's important to note that Hong Kong's dense urban environment and limited land availability present significant challenges for large-scale solar projects. The hilly terrain to the south, while offering excellent views, is less suitable for solar installations due to its steep slopes and forest cover. Offshore areas in the nearby Tathong Channel or further out in eastern waters might be considered for floating solar farms, a technology that is gaining traction globally. These areas could potentially offer the space required for large-scale installations without competing with Hong Kong's scarce land resources. In conclusion, while Chai Wan's topography is diverse and picturesque, it also presents challenges for large-scale solar PV development. Creative solutions, such as utilizing industrial rooftops or exploring offshore options, may be necessary to implement significant solar power generation in this area of Hong Kong.

Citation Guide

Article Details for Citation

Tell Us About Your Work

We love seeing how our research helps others! If you've cited this article in your work, we'd be delighted to hear about it. Drop us a line via our Contact Us page or on X, to share where you've used our information - we may feature a link to your work on our site. This helps create a network of valuable resources for others in the solar energy community and helps us understand how our research is contributing to the field. Plus, we occasionally highlight exceptional works that reference our research on our social media channels.

Feeling generous?

Share this with your friends!

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.