Kunshan, Jiangsu, China, located in the Northern Sub Tropics at coordinates 31.3862, 120.9496, offers a reasonably productive location for solar PV energy generation throughout the year, though with notable seasonal variations.

The solar energy production capacity in Kunshan follows a predictable seasonal pattern. Summer stands out as the most productive period, yielding approximately 4.99kWh per day for each installed kilowatt of solar capacity. Spring follows as the second most productive season with 4.43kWh/day, while autumn generates 3.91kWh/day. Winter sees the lowest output at 3.07kWh/day per installed kilowatt.

Optimal Solar Panel Setup

For fixed solar panel installations in Kunshan, Jiangsu, the ideal tilt angle to maximize year-round energy production is 29 degrees facing South. This specific angle has been calculated to optimize solar capture across all seasons, accounting for the Earth's elliptical orbit and Kunshan's particular latitude.

Environmental Challenges

Several significant environmental factors can impede solar production in Kunshan:

• High humidity and frequent rainfall, especially during the monsoon season, which can reduce solar irradiance
• Air pollution from nearby industrial areas, which can deposit particulate matter on panels and block sunlight
• Occasional typhoons that may damage installations if not properly secured
• Seasonal fog and haze, particularly in winter months

To mitigate these challenges, solar installations in Kunshan should incorporate several preventative measures. Regular cleaning systems are essential to combat pollution and dust accumulation. Sturdy mounting structures designed to withstand typhoon-force winds should be employed. Additionally, using high-efficiency panels that perform better in diffuse light conditions can help maximize output during hazier periods.

Anti-soiling coatings on panel surfaces can reduce the impact of pollution and extend intervals between cleanings. Finally, implementing a slight increase in the tilt angle beyond the optimal 29 degrees may help with natural cleaning from rainfall, though this represents a trade-off with optimal energy capture.

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 319 locations across China. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in China by location

Solar output per kW of installed solar PV by season in Kunshan

Seasonal solar PV output for Latitude: 31.3862, Longitude: 120.9496 (Kunshan, China), 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 Kunshan, China

To maximize your solar PV system's energy output in Kunshan, China (Lat/Long 31.3862, 120.9496) 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 Kunshan, China

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 Kunshan, China. 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
15° South in Summer	37° South in Autumn	47° South in Winter	24° 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 Kunshan, China

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 Kunshan, China.

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 Kunshan, China

Kunshan, positioned at latitude 31.3862° and longitude 120.9496°, lies within the Yangtze River Delta region of eastern China. The topography of this area is characterized predominantly by flat, low-lying plains with minimal elevation changes. The landscape around Kunshan forms part of the broader Jiangnan region, which is known for its network of rivers, lakes, and canals that have historically shaped both the natural environment and human settlement patterns. The terrain in and around Kunshan averages just a few meters above sea level, with virtually no hills or significant natural elevations. This exceptionally flat landscape is the result of thousands of years of alluvial deposition from the Yangtze River system. The region's waterways, including the nearby Wusong River and numerous smaller tributaries and canals, crisscross the landscape, creating a distinctive wetland character in many undeveloped areas.

Surrounding Topographical Features

To the east of Kunshan lies Shanghai, sharing similar flat terrain as it approaches the East China Sea. Westward, the landscape continues its level character toward Suzhou, though some very minor undulations begin to appear as one moves further west toward Taihu Lake, the third-largest freshwater lake in China. The lake creates a slight topographical depression in the otherwise flat region. To the north, the terrain continues its flatness as it extends toward the Yangtze River, while southward the plains stretch toward Hangzhou Bay with minimal topographical variation. The entire region surrounding Kunshan represents one of the most consistently level landscapes in China, with almost imperceptible changes in elevation across substantial distances.

Solar PV Potential Areas

The flat topography around Kunshan offers several advantages for large-scale solar photovoltaic (PV) installations. The most suitable areas for solar development would include: The agricultural plains to the northwest and southwest of Kunshan present extensive open spaces with minimal shading concerns. These areas receive consistent solar exposure due to the absence of natural elevations that might cast shadows. The land is already developed for agriculture, which means installation would require conversion of productive farmland - a consideration that must be balanced against energy production needs. Industrial zones on the outskirts of Kunshan, particularly in the eastern and southern peripheries, offer potential for large rooftop solar installations. The substantial footprint of manufacturing facilities provides ready-made platforms for solar arrays without consuming additional land resources. Reclaimed land areas and former wetlands that have been drained for development but remain unused represent another opportunity. These areas often have limited alternative uses due to soil conditions and may be appropriate for solar conversion. The banks and adjacent areas of the region's numerous canals could potentially support linear solar installations, though careful consideration would need to be given to water management and ecological impacts.

Topographical Challenges

Despite the apparent suitability of the flat terrain, the Kunshan region does face certain topographical challenges for solar development. The area experiences seasonal monsoon conditions that can bring heavy rainfall and occasional flooding to these low-lying plains. Solar installations would require proper drainage systems and elevated mounting to mitigate flood risks. Additionally, the dense network of waterways that characterize the region can fragment potential development sites, potentially limiting the contiguous area available for very large-scale installations. This necessitates careful site selection and potentially distributed approaches to large-scale solar deployment. The intensive urban and industrial development throughout much of the immediate Kunshan area also means that truly large-scale installations might need to be located somewhat farther from the city center, in the more rural plains that extend outward from the urban core.

China solar PV Stats as a country

China ranks 1st in the world for cumulative solar PV capacity, with 306,973 total MW's of solar PV installed. This means that 6.20% of China's total energy as a country comes from solar PV (that's 13th in the world). Each year China is generating 217 Watts from solar PV per capita (China ranks 24th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in China?

Yes, there are several incentives for businesses wanting to install solar energy in China. These include subsidies from the Chinese government, preferential tax policies, and access to low-interest loans. Additionally, businesses may be eligible for renewable energy certificates (RECs) which can be sold on the open market for additional income.

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

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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.