Lerwick, Scotland, United Kingdom is not an ideal location for year-round solar PV energy generation. Located in the Northern Temperate Zone at coordinates 60.1477, -1.1499, this Shetland Islands location faces significant seasonal variations in solar energy production that make it challenging for consistent renewable energy generation.

Seasonal Solar Energy Output

The solar energy production at Lerwick varies dramatically throughout the year. Summer months provide the best generation potential at 4.44 kWh per day per kW of installed solar capacity. Spring offers moderate production at 3.54 kWh per day per kW, making it the second-best season for solar generation. However, the location struggles significantly during autumn and winter months. Autumn production drops to just 1.18 kWh per day per kW, while winter sees extremely poor performance at only 0.44 kWh per day per kW of installed capacity.

Optimal Installation Configuration

For fixed panel installations at Lerwick, Scotland, the ideal angle to tilt solar panels is 50 degrees facing south to maximize total year-round production. This angle is calculated by analyzing daily solar elevation angles at the latitude, determining optimal panel tilt for each day, and weighting these angles by daily photovoltaic potential using solar irradiance data while accounting for Earth's elliptical orbit.

Environmental and Weather Challenges

Several significant local factors can impede solar production at this location:

• High winds and storms common to the Shetland Islands can damage panels and mounting systems
• Salt spray from the surrounding ocean can corrode equipment and reduce panel efficiency
• Frequent cloud cover and precipitation typical of the maritime climate
• Snow accumulation during winter months can block panels

Preventative Measures for Better Performance

To help ensure greater energy production despite these challenges, several installation strategies can be employed:

• Use robust mounting systems designed for high wind loads and frequent storms
• Install panels with anti-corrosive coatings and regular cleaning schedules to combat salt spray
• Consider steeper panel angles to promote natural snow shedding
• Implement monitoring systems to quickly identify and address performance issues
• Use high-quality inverters and electrical components rated for marine environments

Overall, while Lerwick can generate reasonable solar energy during summer and spring months, the extremely low winter production and challenging environmental conditions make it a less than ideal location for solar PV installations compared to more southern latitudes with more consistent year-round solar resources.

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 911 locations across United Kingdom. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in United Kingdom by location

Solar output per kW of installed solar PV by season in Lerwick

Seasonal solar PV output for Latitude: 60.1477, Longitude: -1.1499 (Lerwick, United Kingdom), 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 50° South in Lerwick, United Kingdom

To maximize your solar PV system's energy output in Lerwick, United Kingdom (Lat/Long 60.1477, -1.1499) throughout the year, you should tilt your panels at an angle of 50° 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 Lerwick, United Kingdom

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 Lerwick, United Kingdom. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 50° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
43° South in Summer	62° South in Autumn	72° South in Winter	51° 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 Lerwick, United Kingdom

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 Lerwick, United Kingdom.

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 Lerwick, United Kingdom

Topography Around Lerwick

Lerwick sits on the eastern coast of Mainland, the largest island in the Shetland archipelago. The town is positioned on a natural harbor along Bressay Sound, with the landscape characterized by gently rolling hills and low-lying coastal plains. The immediate vicinity features undulating terrain with elevations rarely exceeding 200 meters above sea level, creating a relatively modest topographical profile typical of the Shetland Islands. The area surrounding Lerwick consists primarily of moorland and grassland, with scattered settlements connected by winding roads that follow the natural contours of the landscape. To the west of the town, the terrain gradually rises into broader hillsides covered in heather and rough pasture. The coastal areas feature a mix of rocky shorelines and small bays, while inland areas are dominated by peat bog and agricultural land used primarily for sheep grazing. The broader Mainland island presents a landscape shaped by glacial activity, resulting in numerous small lochs, valleys, and rounded hills. The topography is generally open and exposed, with few significant trees due to the harsh maritime climate and persistent winds. Stone walls and fences divide much of the landscape into irregular field patterns that have been established over centuries of agricultural use.

Suitable Areas for Large-Scale Solar PV

The most promising locations for large-scale solar photovoltaic installations around Lerwick would be the gently sloping hillsides to the southwest and west of the town. These areas offer several advantages including relatively stable ground conditions, good drainage, and minimal interference with existing residential areas. The gradual slopes provide natural opportunities for optimal panel positioning while avoiding the steepest terrain that would complicate construction and maintenance. The moorland areas extending westward from Lerwick toward the center of Mainland present extensive open spaces with minimal existing development. These locations benefit from being largely unsuitable for intensive agriculture, reducing potential land use conflicts. The firm underlying geology, consisting primarily of metamorphic rocks, would provide stable foundations for solar installations. Areas near the A970 road corridor, which runs north-south through central Mainland, would be particularly advantageous for large solar developments. This proximity to existing infrastructure would facilitate construction access and electrical grid connections while maintaining reasonable distances from populated areas. The relatively flat to gently undulating terrain along this corridor offers extensive developable land with good exposure characteristics. The eastern coastal plains, while flatter than inland areas, may be less suitable due to their proximity to residential areas and potential exposure to salt spray from the North Sea. However, some elevated coastal sites with southern exposure could still present viable opportunities, particularly those positioned on stable ground away from immediate shoreline influences.

United Kingdom solar PV Stats as a country

United Kingdom ranks 14th in the world for cumulative solar PV capacity, with 13,689 total MW's of solar PV installed. This means that 4.00% of United Kingdom's total energy as a country comes from solar PV (that's 20th in the world). Each year United Kingdom is generating 203 Watts from solar PV per capita (United Kingdom ranks 25th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in United Kingdom?

Yes, there are several incentives for businesses wanting to install solar energy in the United Kingdom. The UK government offers a Feed-in Tariff (FiT) scheme which pays businesses for every unit of electricity they generate from their solar panels. Additionally, businesses may be eligible for tax reliefs such as Enhanced Capital Allowances and Renewable Heat Incentives. Finally, some local authorities offer grants or other financial support to help businesses with the cost of installing solar energy systems.

Do you have more up to date information than this on incentives towards solar PV projects in United Kingdom? 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.