Xishan, Hunan, China, situated in the Northern Sub Tropics at coordinates 27.6619, 113.5042, offers a moderately favorable location for solar PV energy generation throughout the year. The solar energy potential varies significantly across seasons, with the highest production occurring during summer months.

Seasonal Solar Performance

The location experiences its peak solar production during summer, generating an impressive 5.66kWh per day for each kilowatt of installed solar capacity. This output drops to 4.01kWh/day during autumn, showing a noticeable decrease as the sun's position changes.

Winter represents the least productive period, with output falling to 2.88kWh/day per installed kilowatt. Spring performs slightly better at 2.97kWh/day, but still significantly below summer values. This seasonal pattern creates a production ratio of nearly 2:1 between the best and worst seasons.

Optimal Panel Installation

For fixed solar panel installations in Xishan, Hunan, the ideal tilt angle is 24 degrees facing South. This specific angle has been calculated to maximize the total year-round energy production, taking into account the sun's changing position throughout the year and the location's specific latitude.

Environmental Considerations

Several environmental factors could potentially impact solar production in Xishan:

• Seasonal monsoon rains may reduce solar efficiency during certain months, particularly in late spring and summer. Installing panels with good drainage systems and water-resistant connections is advisable.
• Air pollution from nearby industrial areas could reduce solar irradiance reaching panels. Regular cleaning schedules are recommended to maintain optimal performance.
• Occasional typhoons in this region necessitate robust mounting systems that can withstand high winds.
• Humidity levels in this subtropical climate can accelerate degradation of equipment. Using corrosion-resistant materials and proper sealing of electrical components is essential.

Despite these challenges, with proper system design and maintenance protocols, Xishan remains a viable location for solar PV installations, particularly systems designed to capitalize on the strong summer production while maintaining reasonable efficiency during the less productive winter months.

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 Xishan

Seasonal solar PV output for Latitude: 27.6619, Longitude: 113.5042 (Xishan, 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 24° South in Xishan, China

To maximize your solar PV system's energy output in Xishan, China (Lat/Long 27.6619, 113.5042) throughout the year, you should tilt your panels at an angle of 24° 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 Xishan, 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 Xishan, China. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 24° 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	32° South in Autumn	43° South in Winter	20° 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 Xishan, 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 Xishan, 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 Xishan, China

The topography around Xishan, China, located at coordinates 27.6619, 113.5042, is characterized by a varied landscape that transitions from mountainous terrain to more level areas. This region sits within the northern part of Jiangxi Province, an area known for its mix of hills, mountains, and valleys.

Mountainous Features

The Xishan area is part of the broader Luoxiao Mountain range system, which extends through parts of Jiangxi, Hunan, and Hubei provinces. These mountains create a diverse topographical profile with numerous ridges and valleys. Elevations in the vicinity vary significantly, with higher points reaching several hundred meters above sea level. The mountains generally run in a northeast to southwest direction, creating natural corridors and watershed boundaries. The mountainous terrain features moderate to steep slopes in many areas, with natural vegetation coverage that varies depending on elevation and human development. These slopes often experience greater precipitation runoff and can have thinner soil layers compared to the lowland areas.

Valley Systems and Flatlands

Between the mountain ridges lie several valley systems that contain more level terrain. These valleys often follow the courses of local rivers and streams that have carved their paths through the more resistant mountain structures over geological time. The valleys broaden in some areas to form small basins where settlements and agricultural activities tend to concentrate. To the east of Xishan, the terrain gradually transitions toward the Poyang Lake basin, China's largest freshwater lake. This transition creates progressively more level topography with improved accessibility and larger contiguous flat areas.

Hydrological Features

The region's topography is significantly influenced by its hydrological systems. Multiple streams and rivers flow through the area, generally moving from the higher elevations toward the east and southeast, eventually contributing to the Yangtze River system. These waterways have shaped the local landscape through erosion processes, creating natural drainage patterns that define much of the local relief. Water bodies, including both natural and man-made reservoirs, dot the landscape, particularly in valley bottoms and flatter areas. These features influence the immediate topography and create microclimates that affect local conditions.

Optimal Areas for Solar PV Development

For large-scale solar photovoltaic development, the most suitable areas near Xishan would be the more level terrain found in the broader valleys and basin areas. These locations offer several advantages: The gently sloping or flat terrain in the valley bottoms and eastern transitions toward the Poyang Lake basin provides larger contiguous areas where solar arrays could be installed with minimal grading requirements. This reduces construction costs and environmental disruption. Areas with southern exposure on gentle slopes actually receive more direct solar radiation in this northern hemisphere location. Certain hillsides with southern aspects that are not too steep might offer enhanced solar collection potential compared to perfectly flat terrain. The valley systems that run northeast to southwest create natural corridors where infrastructure development, including access roads and transmission lines, can follow established routes, potentially reducing the environmental footprint and costs associated with new solar installations. Areas that have already experienced some level of human modification, such as former agricultural lands or disturbed sites, would minimize additional environmental impacts while providing the necessary space for large-scale installations. Locations near existing electrical infrastructure, particularly around more developed communities in the flatter eastern regions, would reduce interconnection costs and transmission losses, making projects more economically viable. Areas away from flood-prone river bottoms but still on level ground would provide more stability for long-term installations while avoiding the most productive agricultural lands that typically occupy fertile river valleys. The most promising large-scale solar PV locations would likely be found in the transitional zones between the mountainous western areas and the lower-lying eastern regions, where sufficient flat land exists but competition with prime agricultural uses might be minimized.

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.