Solar Energy Potential in Haimen, Jiangsu, China

Haimen, Jiangsu, China, located in the Northern Sub Tropics at coordinates 31.8937, 121.1757, offers good but variable conditions for solar energy generation throughout the year. This coastal city experiences distinct seasonal variations in solar energy production that are worth understanding for anyone considering solar PV installation. The seasonal performance shows a clear pattern, with summer being the most productive period at 5.07 kWh per day for each kilowatt of installed capacity. Spring follows closely behind with 4.71 kWh/day, while autumn generates a respectable 4.03 kWh/day. Winter, as expected, produces the least energy at 3.09 kWh/day, though this is still reasonably productive compared to many northern locations globally.

Seasonal Considerations

The most ideal period for solar generation in Haimen spans from late spring through early autumn (approximately May through September). During these months, longer daylight hours combined with generally clearer skies create optimal conditions for solar production. The summer solstice in June typically marks the peak potential, though high humidity during summer can occasionally reduce efficiency. For maximum year-round energy harvesting, solar panels should be installed at a tilt angle of 29 degrees facing South. This specific angle has been calculated to optimize annual solar collection based on Haimen's latitude and the seasonal variation in the sun's position, accounting for Earth's elliptical orbit and weighted by daily PV potential.

Environmental and Weather Factors

Several environmental factors in Haimen can affect solar production:

• Typhoon exposure: Haimen's coastal location makes it vulnerable to typhoons during summer and early autumn. Solar installations should use reinforced mounting systems designed to withstand wind speeds of at least 140-160 km/h.
• Air pollution and haze: Industrial activity in the wider Yangtze River Delta region can create haze conditions that reduce solar irradiance. Regular panel cleaning is essential, ideally every 2-3 months.
• Seasonal humidity and fog: Being near the coast, morning fog and high humidity are common, particularly in spring and summer. This can reduce early morning production efficiency.

Preventative Measures

To maximize solar production in Haimen, Jiangsu, several preventative measures are recommended: Install self-cleaning panels with hydrophobic coatings to combat pollution and dust accumulation. Consider micro-inverter or power optimizer systems rather than string inverters, as these perform better when some panels are temporarily shaded by haze or clouds. Additionally, slightly increasing the panel tilt to 30-32 degrees may improve self-cleaning from rainfall while sacrificing minimal annual production. For larger installations, implementing a weather monitoring system that can adjust expectations and maintenance schedules based on seasonal conditions will optimize long-term performance. Despite these challenges, Haimen's average of 4.23 kWh/day annually per installed kilowatt makes it a generally favorable location for solar PV investment.

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 Haimen

Seasonal solar PV output for Latitude: 31.8937, Longitude: 121.1757 (Haimen, 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 Haimen, China

To maximize your solar PV system's energy output in Haimen, China (Lat/Long 31.8937, 121.1757) 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 Haimen, 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 Haimen, 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
16° 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 Haimen, 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 Haimen, 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 Haimen, China

The topography around Haimen, China (31.8937°N, 121.1757°E) is predominantly characterized by flat, low-lying plains typical of the Yangtze River Delta region. Haimen sits at the eastern edge of Jiangsu Province, where the Yangtze River meets the East China Sea. The elevation across this area is remarkably uniform, generally ranging from just 2 to 5 meters above sea level. This flat landscape has been shaped by centuries of river deposits from the mighty Yangtze and extensive land reclamation projects. The terrain consists primarily of alluvial plains formed by sediment deposition from the Yangtze River. These plains extend for kilometers in all directions, creating a vast, level landscape with minimal natural elevation changes. The area is crisscrossed by numerous waterways, including rivers, streams, and man-made canals that have historically been used for irrigation, transportation, and flood control. These waterways segment the otherwise continuous flat terrain into a patchwork of agricultural plots and developed areas.

Coastal Features

To the east of Haimen lies the East China Sea coastline, characterized by mudflats, salt marshes, and areas of reclaimed land protected by seawalls. The coastal areas experience tidal influences, with some low-lying sections potentially subject to flooding during storm surges or exceptionally high tides. The transition from land to sea is gradual rather than abrupt, with extensive tidal flats extending outward during low tide.

Suitability for Large-Scale Solar PV

When considering areas near Haimen for large-scale solar photovoltaic (PV) installations, several factors related to topography and land use must be considered. The most suitable areas would include: Reclaimed coastal lands to the east of Haimen present excellent opportunities for solar PV development. These areas typically have minimal agricultural value, receive abundant sunlight with few obstructions, and offer large, continuous tracts of land necessary for utility-scale installations. The flat terrain requires minimal grading, reducing construction costs. However, proximity to the sea necessitates corrosion-resistant equipment and designs that can withstand occasional strong coastal winds. Agricultural lands that are less productive or fallow could also be repurposed for solar development. The flat topography throughout the region means that almost any undeveloped land parcel would require minimal site preparation for solar arrays. Areas slightly elevated above the immediate floodplains would be preferable to minimize flood risk. Industrial zones on the outskirts of Haimen and neighboring cities often include brownfield sites or underutilized land parcels that could support solar development while being close to existing electrical infrastructure and demand centers. These areas typically have already been leveled and may have fewer environmental sensitivities than undeveloped sites.

Challenges Related to Topography

Despite the favorable flat terrain, developers must consider several topographical challenges. The low elevation throughout the region means that flood risk management is essential for any large-scale solar installation. Solar arrays may need to be mounted on raised platforms or designed with flood-resistant features. The dense network of waterways that segment the landscape might complicate site access and limit the size of continuous arrays unless bridges or culverts are constructed. The soil composition in this alluvial plain, often consisting of soft silts and clays, may require special foundation designs for solar mounting structures. Geotechnical studies would be necessary to determine appropriate foundation types for the local soil conditions. In conclusion, the flat, open topography around Haimen generally favors large-scale solar PV development from a purely geographical perspective. The most promising areas would be reclaimed coastal lands, less productive agricultural areas, and existing industrial zones, provided that flood risks and soil stability issues are properly addressed.

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

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