Solar Energy Potential in Guilin, Guangxi, China

Guilin, Guangxi, China, located in the Northern Sub Tropics at coordinates 25.2814, 110.299, offers moderate potential for solar energy generation with significant seasonal variations. This picturesque region, famous for its karst landscape, experiences distinct energy production patterns throughout the year. Solar panels in Guilin generate the most electricity during summer, producing an average of 5.38 kWh per day for each kilowatt of installed capacity. This drops to 3.95 kWh/day in autumn, further decreasing to 2.90 kWh/day in winter, with spring showing the lowest output at 2.69 kWh/day per kilowatt installed. For maximum year-round efficiency, fixed solar panels in Guilin should be installed at a 22-degree tilt facing south. This optimal angle balances seasonal variations and maximizes the total annual energy harvest from the available sunlight.

Environmental Challenges for Solar Production

Several significant environmental factors affect solar energy generation in Guilin:

• High humidity and frequent cloud cover, especially during spring and early summer, can reduce solar efficiency
• The monsoon season (April-June) brings extended periods of rainfall and overcast conditions
• Winter fog, particularly in December and January, can significantly limit morning solar production
• Occasional typhoons and severe storms may temporarily disrupt solar generation

To mitigate these challenges, solar installations in Guilin should incorporate robust mounting systems capable of withstanding occasional strong winds. Regular cleaning schedules are essential to remove dust and pollen accumulation, which is particularly heavy during spring. Additionally, implementing microinverters or power optimizers can help minimize production losses during partial shading conditions caused by cloud cover. The substantial summer production can partially offset the lower output during winter and spring months, making annual production reasonably balanced despite the seasonal variations. Commercial installations may benefit from slight adjustments to the panel angle twice yearly to optimize for seasonal sun positions.

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 Guilin

Seasonal solar PV output for Latitude: 25.2814, Longitude: 110.299 (Guilin, 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 22° South in Guilin, China

To maximize your solar PV system's energy output in Guilin, China (Lat/Long 25.2814, 110.299) throughout the year, you should tilt your panels at an angle of 22° 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 Guilin, 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 Guilin, China. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 22° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
10° South in Summer	29° South in Autumn	41° South in Winter	18° 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 Guilin, 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 Guilin, 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 Guilin, China

The topography around Guilin, China is characterized by its dramatic limestone karst landscape, one of the most recognizable natural features in all of China. This unique geological formation consists of thousands of tall, steep-sided karst hills and mountains that rise abruptly from the relatively flat terrain surrounding them. These karst formations, which have been shaped over millions of years by the dissolution of limestone, create a surreal, almost otherworldly landscape that has inspired Chinese artists and poets for centuries. The Li River (Lijiang) winds through this karst wonderland, carving a path between the towering peaks. The river valley forms a natural corridor through the region, with the iconic karst mountains rising on either side. This distinctive scenery appears on the reverse side of the 20 yuan note, highlighting its cultural significance to China.

Terrain Characteristics

The elevation in the Guilin area varies significantly. The city of Guilin itself sits at approximately 150 meters above sea level, while the surrounding karst peaks reach heights of 200-500 meters above the valley floor. This creates a basin-like topography where the urban areas and agricultural lands occupy the flatter sections between the mountains. The karst formations are not uniformly distributed; they appear in clusters with varying densities throughout the region. Between these clusters are relatively flat plains and river valleys that have historically been used for agriculture, particularly rice cultivation. These flat areas typically have good access to water from the Li River and its tributaries.

Solar PV Potential

For large-scale solar photovoltaic (PV) installations, the most suitable areas near Guilin would be the flat plains between the karst formations rather than the mountains themselves. These areas offer several advantages: The flat terrain between karst formations provides open spaces that receive consistent sunlight without shadowing from the tall peaks during significant portions of the day. These inter-mountain plains, particularly to the northeast and southwest of Guilin city, offer suitable topography for solar installations. Agricultural plains in the broader Guangxi region surrounding Guilin, especially where land might be less productive for farming, could be repurposed for solar energy generation. These areas have the advantage of being relatively flat, accessible, and already connected to transportation networks. The plateaus and gentler slopes found in the outer regions of the karst landscape, particularly towards the southeast of Guilin, present opportunities for solar development. These higher elevation areas might receive less fog than the river valleys below.

Topographical Challenges

Despite these potential areas, the region does present certain challenges for large-scale solar development. The karst landscape limits the availability of large, continuous tracts of flat land in immediate proximity to Guilin city. The mountainous terrain creates natural shadows during different parts of the day, potentially reducing efficiency in areas directly adjacent to tall formations. Additionally, the region experiences a subtropical monsoon climate with significant rainfall, particularly during summer months. This creates high humidity and frequent cloud cover, which can affect solar efficiency. The valleys between karst formations can also experience morning fog, particularly in autumn and winter, which might temporarily reduce solar generation capacity. The broader Guangxi region, moving away from the densest karst formations, offers more expansive flat areas that would be better suited for large-scale solar PV projects. These areas, while still benefiting from the region's solar resources, avoid some of the topographical limitations of the immediate Guilin area.

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.