Totnes, England, United Kingdom presents a challenging location for year-round solar energy generation, with significant seasonal variations that make it less than ideal for consistent solar PV output throughout the year.

Seasonal Solar Performance

The solar energy production at Totnes varies dramatically across the seasons. Summer offers the best performance with 5.80kWh per day per kW of installed capacity, making it an excellent time for solar generation. Spring also provides strong output at 4.86kWh per day per kW, offering nearly comparable performance to summer months. However, the location faces substantial challenges during the darker months. Autumn production drops significantly to 2.45kWh per day per kW, while winter performance plummets to just 1.07kWh per day per kW. This represents more than a five-fold difference between peak summer and winter production.

Optimal Installation Configuration

For fixed panel installations at Totnes, England, the ideal angle to tilt solar panels is 42 degrees facing south to maximize total year-round production. This angle is calculated by analyzing daily solar elevation angles throughout the year and weighting them according to solar irradiance data to achieve the best annual average performance.

Local Factors Affecting Solar Production

Several environmental and weather factors at Totnes can significantly impact solar energy generation:

• Frequent cloud cover and overcast skies typical of the UK's maritime climate
• High humidity and moisture levels that can reduce panel efficiency
• Salt air exposure due to proximity to coastal areas, which can cause corrosion
• Regular rainfall that, while helpful for cleaning, can reduce production during wet periods
• Potential for moss and lichen growth in the damp climate

Preventative Measures for Better Performance

To maximize solar energy production despite these challenges, several installation strategies can help:

• Install panels with anti-reflective coatings designed for low-light conditions
• Use corrosion-resistant mounting hardware and materials rated for marine environments
• Ensure proper drainage and ventilation behind panels to prevent moisture buildup
• Plan for regular cleaning and maintenance schedules to remove organic growth
• Consider micro-inverters or power optimizers to minimize impact of partial shading from clouds
• Install panels at the optimal 42-degree tilt with adequate spacing to prevent self-shading

While Totnes can generate reasonable solar energy during spring and summer months, the dramatic winter reduction makes it a location where solar PV works best as part of a mixed energy strategy rather than as a standalone year-round solution.

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 Totnes

Seasonal solar PV output for Latitude: 50.4308, Longitude: -3.6814 (Totnes, 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 42° South in Totnes, United Kingdom

To maximize your solar PV system's energy output in Totnes, United Kingdom (Lat/Long 50.4308, -3.6814) throughout the year, you should tilt your panels at an angle of 42° 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 Totnes, 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 Totnes, United Kingdom. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 42° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
34° South in Summer	54° South in Autumn	64° South in Winter	42° 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 Totnes, 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 Totnes, 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 Totnes, United Kingdom

Topographical Features Around Totnes

Totnes sits in a particularly scenic section of South Devon, positioned along the River Dart approximately eight miles inland from the coast. The town occupies a valley location where the river meanders through gently rolling countryside characteristic of the South Hams district. The immediate terrain around Totnes features a mix of river valley bottomland and surrounding hills that rise gradually from the water's edge.

The landscape is defined by the ancient geological formations of the Devon countryside, with elevations ranging from near sea level along the River Dart to modest hills reaching approximately 200 metres above sea level in the surrounding area. The topography consists primarily of rounded hills and gentle slopes, interspersed with small valleys carved by tributary streams that feed into the main river system.

To the east and west of Totnes, the terrain becomes more undulating as it transitions into the broader South Devon landscape. The area features a patchwork of agricultural fields, woodlands, and hedgerows that follow the natural contours of the land. The soil composition is predominantly red Devon earth, typical of this region, which supports the area's traditional farming activities.

Solar Development Potential in the Region

The most promising areas for large-scale solar photovoltaic installations around Totnes would be the gently sloping hillsides and plateau areas that extend to the south and southwest of the town. These elevated positions offer several advantages including reduced shading from surrounding vegetation and buildings, while maintaining reasonable access for construction and maintenance activities.

The agricultural fields on the higher ground between Totnes and the coastal areas present particularly suitable conditions for solar development. These locations typically feature open aspects with minimal obstruction from trees or built structures, and the gentle gradients allow for efficient panel positioning and drainage considerations.

Areas to the northwest of Totnes, where the landscape opens up toward Buckfastleigh, also demonstrate good potential for solar installations. The terrain in this direction consists of broader, more open countryside with fewer steep gradients and less dense woodland coverage compared to some other directions around the town.

The river valley floor itself would be less suitable for large-scale solar development due to potential flooding concerns, higher humidity levels, and the tendency for morning mist and fog to linger in low-lying areas. Additionally, the steeper hillsides immediately adjacent to the River Dart would present installation challenges and may experience more variable shading conditions throughout the day.

The coastal-facing slopes to the south of Totnes benefit from the area's generally mild maritime climate and would experience fewer extreme weather conditions that might affect solar panel performance. These locations also tend to have good natural drainage, which is beneficial for the long-term maintenance of solar installations.

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.