Solar Energy Potential in Heshan, Hunan, China

Heshan, Hunan, China, located in the Northern Sub Tropics at coordinates 28.5694, 112.3473, offers moderate potential for solar PV energy generation throughout the year. The location experiences seasonal variations in solar energy production that follow predictable patterns. Solar energy output at this location shows significant seasonal differences. Summer is the most productive season with an average daily output of 5.31kWh per kW of installed capacity. This drops to 3.90kWh/day in autumn, reaches its lowest point in winter at 2.70kWh/day, and slightly recovers to 3.00kWh/day during spring.

Optimal Panel Installation

For fixed solar panel installations in Heshan, Hunan, the ideal tilt angle to maximize year-round energy production is 25 degrees facing South. This angle optimizes the capture of solar energy across all seasons, balancing the higher summer sun path with the lower winter sun trajectory.

Seasonal Considerations

Summer clearly represents the peak production period in Heshan, Hunan, with nearly twice the daily energy generation compared to winter. This makes the period from June through August ideal for solar energy production. The substantial difference between summer and winter output (5.31kWh/day vs. 2.70kWh/day) indicates that seasonal planning for energy needs is important in this location.

Environmental and Weather Challenges

Several environmental factors could potentially impact solar production in Heshan:

• Monsoon rainfall: The region experiences a monsoon climate with heavy summer rains that can temporarily reduce solar output through cloud cover and direct rainfall.
• Air pollution: Being in a rapidly industrializing region of China, Heshan may experience air pollution that can diminish solar radiation reaching panels.
• Dust accumulation: Seasonal dust can reduce panel efficiency if not regularly cleaned.

To mitigate these challenges, several preventative measures can be implemented:

Preventative Measures

Installing self-cleaning panels or implementing regular cleaning schedules can address dust accumulation issues. Using micro-inverters or power optimizers can help minimize production losses during partial shading from clouds. Additionally, slightly increasing the tilt angle beyond the recommended 25 degrees may help with natural cleaning from rainfall and reduce dust buildup. For pollution concerns, high-quality panels with anti-reflective coatings can maximize light absorption even during hazier conditions. Finally, a robust mounting system designed to withstand monsoon winds will ensure system longevity. Despite these challenges, Heshan's annual average daily production of approximately 3.73kWh per kW installed capacity makes solar PV a viable renewable energy option for this location, particularly when these preventative measures are incorporated into system design and maintenance.

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 Heshan

Seasonal solar PV output for Latitude: 28.5694, Longitude: 112.3473 (Heshan, 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 25° South in Heshan, China

To maximize your solar PV system's energy output in Heshan, China (Lat/Long 28.5694, 112.3473) throughout the year, you should tilt your panels at an angle of 25° 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 Heshan, 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 Heshan, China. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 25° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
12° South in Summer	33° South in Autumn	44° South in Winter	21° 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 Heshan, 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 Heshan, 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 Heshan, China

The topography around Heshan, located in Hunan Province, China, is characterized by a diverse landscape of rolling hills, valleys, and lowlands. Situated in the central region of Hunan, Heshan is part of a transitional zone between the Xuefeng Mountains to the west and the Dongting Lake Plain to the east. The area features moderate elevation changes, with hills typically ranging from 100 to 500 meters above sea level. The terrain around Heshan displays a classic southern Chinese landscape pattern, with numerous small hills interspersed with narrow valleys. These valleys often contain tributaries that eventually flow into larger river systems connected to the Yangtze River watershed. The natural topography has been modified over centuries of human habitation, with terraced slopes for agriculture being a common sight throughout the region.

Surrounding Landforms

To the west of Heshan, the terrain gradually rises toward the Xuefeng Mountain range, creating more pronounced hills and deeper valleys. These western areas generally have steeper slopes and more rugged terrain, with some peaks reaching over 1,000 meters in elevation. The eastern direction from Heshan transitions into gentler topography as it approaches the Dongting Lake Plain, with more gradual slopes and wider valleys. The region experiences a subtropical monsoon climate, which has significantly influenced the topography through erosion patterns. The combination of abundant rainfall and relatively soft bedrock has created a landscape marked by rounded hills rather than sharp peaks, giving the area its characteristic undulating appearance.

Optimal Areas for Solar PV Development

For large-scale solar photovoltaic (PV) installations near Heshan, several topographical factors must be considered. The most suitable areas would be found in the eastern and southeastern sectors of the region, where the landscape transitions to lower elevations with gentler slopes. These areas offer several advantages for solar PV development: The flatter terrain in the eastern lowlands provides more consistent sun exposure throughout the day and requires less site preparation, making construction more economical. These areas also typically have fewer shadowing effects from surrounding hills, maximizing solar energy capture potential. South-facing hillsides with moderate slopes (between 5-15 degrees) in the region can also be advantageous for solar PV installations. These natural inclines can optimize the angle of solar panels relative to the sun's path, potentially increasing energy generation efficiency compared to completely flat installations. The valleys extending eastward from Heshan toward the Dongting Lake Plain represent particularly promising locations. These broader valleys offer expanses of land with minimal shadowing from surrounding hills while still being elevated enough to avoid potential flooding concerns that might affect areas closer to major waterways. Areas to avoid would include the steeper western highlands, where construction challenges, increased cloud cover at higher elevations, and potential shadowing from adjacent mountains could significantly reduce the viability of large-scale solar installations. The northeastern corridor between Heshan and Changsha also presents opportunities for solar development, as this area features a gradual transition to lower elevations with adequate flat or gently sloping terrain. This corridor benefits from existing transportation infrastructure, which would facilitate construction and maintenance of large-scale solar facilities.

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.