Zhoushan, Zhejiang, China, located in the Northern Sub Tropics at coordinates 29.9914°N, 122.1967°E, presents a moderately favorable location for year-round solar photovoltaic energy generation, though with notable seasonal variations in output.

Seasonal Solar Performance

The solar energy production at Zhoushan varies significantly throughout the year. Summer delivers the highest output at 5.22 kWh per day per kW of installed solar capacity, making it the peak season for solar generation. Spring follows as the second-best performing season with 4.21 kWh per day per kW, while autumn produces 3.94 kWh per day per kW. Winter presents the most challenging period for solar generation, dropping to 2.97 kWh per day per kW of installed capacity. This represents a substantial 43% decrease compared to summer production levels. For optimal year-round performance at this location, solar panels should be installed at a fixed tilt angle of 27 degrees facing south. This angle maximizes total annual energy production by accounting for the sun's varying position throughout the year and the Earth's elliptical orbit.

Environmental and Weather Challenges

Several significant local factors can impede solar production in Zhoushan and require careful consideration during installation:

• Coastal salt air and corrosion: Being located on an island in the East China Sea, Zhoushan experiences high salt content in the air that can corrode solar panel frames, mounting systems, and electrical connections over time
• Typhoon and severe weather exposure: The location is susceptible to typhoons and strong coastal winds that can damage or displace solar installations
• High humidity and moisture: The subtropical coastal climate creates persistent humidity that can lead to electrical issues and reduced panel efficiency
• Monsoon season impacts: Extended periods of cloud cover and heavy rainfall during monsoon seasons can significantly reduce solar output

Preventative Installation Measures

To maximize energy production and system longevity in Zhoushan's challenging coastal environment, several preventative measures should be implemented:

• Use marine-grade materials: Install solar panels with aluminum frames treated for marine environments and use stainless steel or specially coated mounting hardware to resist salt corrosion
• Enhanced structural design: Employ reinforced mounting systems designed to withstand high wind loads and consider aerodynamic panel layouts to reduce wind resistance during typhoons
• Improved sealing and drainage: Ensure all electrical connections use marine-grade weatherproof enclosures and install proper drainage systems to prevent water accumulation
• Regular maintenance scheduling: Implement frequent cleaning and inspection routines to remove salt buildup and identify corrosion early, particularly after storm events

Despite these challenges, Zhoushan's location offers reasonable solar potential, particularly during the warmer months. With proper installation techniques and materials suited to the coastal environment, solar PV systems can perform effectively year-round at this location.

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 Zhoushan

Seasonal solar PV output for Latitude: 29.9914, Longitude: 122.1967 (Zhoushan, 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 27° South in Zhoushan, China

To maximize your solar PV system's energy output in Zhoushan, China (Lat/Long 29.9914, 122.1967) throughout the year, you should tilt your panels at an angle of 27° 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 Zhoushan, 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 Zhoushan, China. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 27° 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	34° South in Autumn	45° South in Winter	23° 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 Zhoushan, 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 Zhoushan, 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 Zhoushan, China

Topographical Features of Zhoushan

Zhoushan is situated in an archipelago consisting of over 1,300 islands scattered across the East China Sea, located off the eastern coast of Zhejiang Province. The region is characterized by a complex maritime landscape where numerous islands of varying sizes create a distinctive topographical pattern. The main Zhoushan Island, along with Putuo Island and several other significant landmasses, forms the core of this island cluster. The terrain across the Zhoushan archipelago is predominantly hilly and mountainous, with elevations typically ranging from sea level to several hundred meters above sea level. The highest peaks reach approximately 500 meters, creating a rolling landscape of ridges and valleys that descend toward rocky coastlines. These hills are generally composed of granite and other igneous rocks, forming steep slopes and dramatic coastal cliffs in many areas. The coastline throughout the region is highly irregular, featuring numerous bays, inlets, and protected harbors. Rocky shores dominate much of the perimeter, though sandy beaches and mudflats can be found in sheltered areas. The complex shoreline creates microclimates and varying exposure conditions across different parts of the islands.

Inland Topographical Characteristics

Moving inland from the coastal areas, the topography becomes increasingly varied with a network of hills and small mountains creating natural drainage patterns. Valleys between the elevated areas often contain small agricultural plots and settlements, while the higher elevations remain largely undeveloped due to the challenging terrain. The soil composition varies considerably across the islands, with rocky outcrops common on higher elevations and more fertile alluvial deposits found in the lower-lying areas and valleys. Vegetation coverage includes both natural forest areas on the steeper slopes and cultivated land in the more accessible regions.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for large-scale solar photovoltaic installations in the Zhoushan region would be the relatively flat or gently sloping areas found on the larger islands. The southern and southeastern facing slopes of the hills would provide excellent solar exposure while offering sufficient space for substantial installations. Areas with elevations between 50 and 200 meters above sea level present the best compromise between accessibility and optimal positioning for solar collection. These zones typically have less steep gradients than the higher peaks while remaining above potential flood zones and salt spray effects from the ocean. The larger islands in the archipelago, particularly areas on the main Zhoushan Island, offer the most practical locations for significant solar developments. Flat or moderately sloping terrain that has been previously cleared for agriculture or other development would require minimal site preparation compared to forested hillsides. Coastal plains and broader valley areas between hills would also serve as excellent candidates for solar installations, provided they are positioned away from sensitive marine ecosystems and do not interfere with existing fishing or maritime activities that are crucial to the local economy. The island setting provides advantages for solar development including reduced air pollution compared to mainland industrial areas, which can improve panel efficiency, and the maritime climate helps moderate extreme temperatures that might otherwise affect equipment performance.

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.

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.