Carmarthen, a town in southwest Wales, United Kingdom, presents a mixed scenario for solar PV energy generation. Located at 51.8646° N, -4.2634° W in the Northern Temperate Zone, this location experiences significant seasonal variations in solar energy production.

Seasonal Solar Output

Solar energy generation in Carmarthen fluctuates considerably throughout the year. Summer stands out as the most productive season, with an average daily output of 5.84 kWh per kW of installed solar capacity. Spring follows closely behind, yielding 5.04 kWh/day. However, autumn and winter see a dramatic decrease in production, with 2.21 kWh/day and 1.05 kWh/day respectively.

Optimal Times for Solar Generation

The most favorable period for solar energy production in Carmarthen spans from late spring through early autumn. During these months, longer daylight hours and higher sun angles contribute to increased solar panel efficiency. Conversely, the winter months, particularly December and January, offer minimal solar potential due to shorter days and lower sun angles.

Panel Tilt Angle

To maximize year-round solar production in Carmarthen, fixed solar panels should be installed at a tilt angle of 44 degrees facing south. This angle optimizes the panels' exposure to sunlight throughout the year, balancing the seasonal variations in sun position.

Environmental and Weather Factors

Several factors can impact solar energy production in Carmarthen:

1. Cloud cover: The region experiences frequent cloudy days, particularly in autumn and winter, which can significantly reduce solar output.
2. Rainfall: Carmarthen's climate includes regular rainfall, which can temporarily decrease panel efficiency.
3. Maritime climate: The town's proximity to the coast may lead to salt spray accumulation on panels, potentially affecting their performance over time.

Preventative Measures

To mitigate these challenges and enhance solar energy production, consider the following measures:

• Install high-efficiency panels designed for low-light conditions to improve performance on cloudy days.
• Implement a regular cleaning schedule to remove salt deposits and other debris from panel surfaces.
• Consider using microinverters or power optimizers to minimize the impact of partial shading on overall system performance.
• Explore the possibility of tracking systems to maximize solar exposure, especially during the productive summer months.

While Carmarthen's location presents some challenges for year-round solar energy production, proper system design and maintenance can still yield significant benefits, particularly during the spring and summer months.

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 Carmarthen

Seasonal solar PV output for Latitude: 51.8646, Longitude: -4.2634 (Carmarthen, 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 44° South in Carmarthen, United Kingdom

To maximize your solar PV system's energy output in Carmarthen, United Kingdom (Lat/Long 51.8646, -4.2634) throughout the year, you should tilt your panels at an angle of 44° 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 Carmarthen, 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 Carmarthen, United Kingdom. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 44° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
35° South in Summer	55° South in Autumn	65° South in Winter	44° 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 Carmarthen, 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 Carmarthen, 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 Carmarthen, United Kingdom

The topography around Carmarthen, United Kingdom, is characterized by a diverse landscape that combines rolling hills, river valleys, and coastal plains. Situated in southwestern Wales, Carmarthen is nestled in the heart of Carmarthenshire, a county known for its picturesque countryside. To the north and east of Carmarthen, the terrain gradually rises into the foothills of the Cambrian Mountains. These hills are generally gentle in slope, with rounded peaks and wide valleys. The landscape is dotted with small farms, pastures, and patches of woodland, creating a patchwork of green fields and hedgerows typical of rural Wales. To the south and west, the land becomes flatter as it approaches the coast. The River Towy, which flows through Carmarthen, has carved a wide valley that opens up into a broad floodplain. This area is characterized by fertile agricultural land and wetlands, with the river meandering towards its estuary at Carmarthen Bay.

Potential Areas for Large-Scale Solar PV

When considering areas near Carmarthen that would be most suited to large-scale solar PV installations, several factors come into play. The ideal locations would have relatively flat or gently sloping terrain, good exposure to sunlight, and minimal shading from hills or trees. The coastal plains to the south and southwest of Carmarthen offer promising potential for solar PV development. These areas are generally flatter, which makes installation and maintenance easier. They also tend to receive more sunlight due to their proximity to the coast and lack of significant geographical obstructions. Some of the gently rolling farmland to the east and northeast of Carmarthen could also be suitable for solar PV installations. While the terrain is more undulating here, there are still expanses of open land that receive good sunlight exposure. However, care would need to be taken to avoid areas of high agricultural value or ecological importance. It's important to note that while the topography around Carmarthen offers potential for solar PV development, any large-scale installations would need to be carefully planned to minimize impact on the local landscape and environment. Factors such as grid connectivity, local planning regulations, and environmental considerations would also play crucial roles in determining the most suitable locations for solar PV projects in this region.

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.