Weihai, China, situated at 37.5074° N, 122.1225° E in the Northern Temperate Zone, demonstrates varying potential for solar energy generation throughout the year. This coastal city experiences seasonal fluctuations in solar electricity production that follow predictable patterns.

Solar panels in Weihai perform exceptionally well during summer months, generating approximately 5.38 kWh per day for each kilowatt of installed capacity. Spring follows closely behind with 5.28 kWh/day production, making these warmer seasons ideal for solar energy harvesting. Performance drops considerably during autumn (3.45 kWh/day) and reaches its lowest during winter months (2.67 kWh/day).

Optimal Installation Angle

For fixed solar panel installations in Weihai, the ideal tilt angle to maximize year-round energy production is 33 degrees facing South. This specific angle optimizes solar capture across all seasons, balancing between the higher summer sun path and lower winter sun position.

Environmental Considerations

Several environmental factors may affect solar production in Weihai. As a coastal city, salt spray can gradually accumulate on panel surfaces, potentially reducing efficiency by creating a film that blocks sunlight. Regular cleaning with demineralized water and installing panels slightly further inland where possible can mitigate this issue.

Weihai experiences seasonal fog, particularly during spring and early summer, which can temporarily reduce solar output. While unavoidable, this impact can be minimized by ensuring panels are installed in elevated locations with maximum exposure.

The region also occasionally faces air quality challenges from industrial activities in the broader Shandong province. Installing panels with anti-soiling coatings and implementing routine cleaning schedules can help maintain optimal performance despite potential particulate buildup.

During winter, occasional snowfall may temporarily cover panels. Installing panels at the recommended 33-degree tilt not only optimizes annual production but also promotes natural snow shedding, while snow removal services should be considered for heavier accumulations.

Note: The Northern Temperate Zone extends from 35° latitude North up to 66.5° 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 Weihai

Seasonal solar PV output for Latitude: 37.5074, Longitude: 122.1225 (Weihai, 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 33° South in Weihai, China

To maximize your solar PV system's energy output in Weihai, China (Lat/Long 37.5074, 122.1225) throughout the year, you should tilt your panels at an angle of 33° 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 Weihai, 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 Weihai, China. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 33° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
21° South in Summer	42° South in Autumn	52° South in Winter	30° 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 Weihai, 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 Weihai, 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 Weihai, China

Weihai, situated at the easternmost point of China's Shandong Peninsula, presents a diverse topographical landscape characterized by a unique combination of coastal features, rolling hills, and mountainous terrain. The city stretches along the coastline of the Yellow Sea, creating a crescent-shaped urban area that follows the natural contours of the land. The topography of Weihai is predominantly hilly, with elevations gradually increasing as one moves inland from the coast. The coastal areas feature relatively flat terrain with numerous bays, coves, and natural harbors that have historically supported the region's maritime activities. The shoreline alternates between sandy beaches and rocky outcroppings, creating a varied coastal ecosystem.

Inland Terrain Features

Moving inland from the coast, the landscape transitions into a series of rolling hills and low mountains. These hills generally range from 100 to 300 meters in elevation, creating a gently undulating terrain across much of the region. The most prominent elevated feature near Weihai is the Kunyu Mountain range, which extends across parts of the peninsula and reaches heights of approximately 900 meters at its tallest peaks. The region also contains several valleys and small plains between the hill systems, many of which have been traditionally used for agriculture. These relatively flat areas are interspersed throughout the otherwise hilly terrain, creating pockets of accessible land amidst the more challenging topography.

Hydrological Features

Weihai's topography includes numerous small rivers and streams that flow from the inland hills toward the Yellow Sea. These waterways have carved shallow valleys through the hilly terrain over time, further diversifying the landscape. While there are no major rivers in the immediate vicinity of Weihai, these smaller water systems play an important role in the local ecology and agricultural practices. Several reservoirs and small lakes can also be found in the region, typically situated in natural depressions between hills. These water bodies not only serve practical purposes for water management but also contribute to the scenic quality of the landscape.

Optimal Areas for Solar PV Development

For large-scale solar photovoltaic (PV) installations, certain areas around Weihai present more favorable conditions than others. The gently sloping hillsides facing south and southeast offer particularly promising locations for solar development. These areas benefit from favorable sun exposure throughout the day while avoiding the premium coastal land that is typically reserved for tourism, residential, and commercial development. The inland valleys and small plains between the hill systems also present viable options for solar PV installations. These relatively flat areas simplify construction and maintenance while still receiving good sun exposure. Particularly suitable are the slightly elevated plateaus found in the western and southwestern parts of the Weihai region, which combine favorable topography with reduced competition from other land uses. Areas to avoid would include the steeper slopes of the Kunyu Mountains, where installation would be technically challenging and environmentally disruptive. Similarly, the limited agricultural lands in the region may be better preserved for food production rather than converted to energy generation. The northeastern coastal areas, while offering good exposure, face stronger winds from the Yellow Sea that could potentially impact the durability of solar installations. Additionally, these coastal areas typically command higher land prices due to their tourism and residential value. In summary, the most suitable locations for large-scale solar PV development around Weihai would be the south-facing gentle slopes and plateau areas in the western and southwestern parts of the region, where the topography provides both good solar exposure and relatively straightforward installation conditions while minimizing conflicts with other valuable land uses.

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.