Solar Energy Potential in Shanwei, Guangdong, China

Shanwei, Guangdong, China, located at latitude 22.7785° and longitude 115.3452°, offers a promising location for solar photovoltaic (PV) energy generation. Situated in the tropics, this coastal city benefits from relatively consistent sunlight throughout the year, though with seasonal variations that impact energy production. The solar energy potential in Shanwei shows strong performance across all seasons. During summer, solar panels can generate approximately 5.74 kWh per day for each kilowatt of installed capacity. Spring shows nearly identical production at 5.75 kWh/day. Autumn remains robust with 5.19 kWh/day, while winter sees a moderate decrease to 4.40 kWh/day per kilowatt installed. For fixed solar panel installations in Shanwei, Guangdong, the ideal tilt angle to maximize year-round energy production is 21 degrees facing South. This specific angle optimizes solar capture throughout the year, balancing the seasonal variations in sun position and intensity.

Seasonal Considerations

The most productive seasons for solar generation in Shanwei are spring and summer, with nearly identical daily output. This makes the period from March through August particularly valuable for solar energy production. Autumn maintains good generation capacity, while winter shows a roughly 24% reduction compared to peak seasons. This relatively modest seasonal variation is characteristic of tropical locations, where the sun's path doesn't change as dramatically throughout the year as in temperate regions. The consistent performance across seasons makes Shanwei suitable for year-round solar energy production, though system sizing should account for the winter decrease.

Environmental Challenges

Several environmental factors could impact solar production in Shanwei:

• Typhoons and tropical storms: As a coastal city in southern China, Shanwei faces seasonal typhoon risks that could damage solar installations or reduce production during extended periods of cloud cover.
• High humidity and coastal salt spray: The proximity to the South China Sea creates conditions where salt-laden moisture can accumulate on panels and cause corrosion or reduced efficiency.
• Monsoon season rainfall: Heavy precipitation during the wet season can temporarily reduce solar output and potentially cause flooding issues for ground-mounted systems.
• Air pollution: Industrial activities in the broader region can create haze that diminishes solar radiation reaching panels.

Preventative Measures

To maximize solar production despite these challenges, several installation considerations are recommended: Solar mounting systems in Shanwei should be typhoon-rated with reinforced foundations and frames designed to withstand high winds. Marine-grade materials and special coatings should be used for all components to prevent salt corrosion, while implementing regular cleaning schedules will remove salt deposits. Elevated mounting for ground systems can prevent flood damage during heavy monsoon rains. Additionally, micro-inverter or power optimizer technology can help minimize production losses when some panels are shaded or soiled, which is particularly valuable during periods of inconsistent weather. Overall, Shanwei presents a favorable location for solar PV deployment with good year-round production potential, provided that installations are designed with local environmental conditions in mind.

Note: The Tropics are located between 23.5° North and -23.5° South of the equator.

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 Shanwei

Seasonal solar PV output for Latitude: 22.7785, Longitude: 115.3452 (Shanwei, 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 21° South in Shanwei, China

To maximize your solar PV system's energy output in Shanwei, China (Lat/Long 22.7785, 115.3452) throughout the year, you should tilt your panels at an angle of 21° 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 Shanwei, 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 Shanwei, China. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 21° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
7° South in Summer	28° South in Autumn	38° South in Winter	15° 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 Shanwei, 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 Shanwei, 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 Shanwei, China

The topography around Shanwei, China is characterized by a diverse landscape that transitions from coastal plains to rolling hills as one moves inland. Situated on the southeastern coast of Guangdong Province, Shanwei features a lengthy coastline along the South China Sea, with numerous bays, inlets, and estuaries. The immediate coastal areas are predominantly flat, with sandy beaches, tidal flats, and some marshlands near river mouths. Moving slightly inland, the terrain begins to undulate with low hills and small plateaus. These areas typically range from 50 to 200 meters above sea level, creating a gently rolling landscape. The soil composition in these regions tends to be a mix of sandy loam and clay, supporting agricultural activities throughout the region.

Inland Topography

As one progresses further inland and northwest from Shanwei, the elevation gradually increases, with more pronounced hills and small mountains appearing. These higher elevations can reach 300-500 meters in some areas, particularly in the northern parts of the region. The terrain in these sections becomes more rugged, with steeper slopes and deeper valleys carved by seasonal streams and rivers. The Lianhua Mountain range influences the northwestern portions of the region, creating more variable terrain with some peaks exceeding 500 meters. These mountains are typically covered with subtropical vegetation, though some areas have been converted to terraced agriculture or commercial forestry.

River Systems

Several river systems traverse the Shanwei area, including the Lianjiang River, which flows through the region and creates fertile valleys. These river valleys form natural corridors through the hillier sections and have historically been centers of agricultural production and settlement.

Potential Solar PV Locations

For large-scale solar photovoltaic installations, the most suitable areas around Shanwei would be the gently sloping hillsides and plateaus that lie 5-15 kilometers inland from the coast. These locations offer several advantages: The slightly elevated positions (50-150 meters above sea level) tend to experience less coastal fog and humidity compared to immediate shoreline areas, potentially increasing solar exposure. These inland hills also benefit from reduced salt spray, which can degrade solar equipment over time. The northwestern areas beyond the immediate Shanwei vicinity, where the terrain opens into broader valleys and plateaus, present excellent opportunities for large installations. These locations combine favorable topography with sufficient land area to accommodate extensive arrays. Some of the reclaimed coastal flatlands could also be suitable, particularly areas that are not prime agricultural land. These locations offer the advantage of minimal site preparation requirements, though they may face greater challenges from typhoons and coastal weather events.

Topographical Challenges

The steeper mountainous areas to the northwest would be less ideal for large-scale installations due to the increased construction complexity and potential for shadowing effects. Similarly, the immediate coastal zones, while flat, face increased exposure to typhoons and storm surges that could damage solar infrastructure. Areas along river floodplains, while flat and accessible, may face periodic flooding risks that would complicate solar development. The southeastern Guangdong region, including Shanwei, experiences a monsoon climate with significant seasonal precipitation that must be considered in site selection and engineering. The most promising compromise between topographical suitability and practical considerations would likely be the transitional zones between coastal plains and inland hills, particularly in areas with southern or southwestern exposure that maximizes solar collection potential throughout the year.

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.