Castlebar, Connacht, a town in County Mayo, Ireland, presents a mixed picture for solar energy generation throughout the year. Located in the Northern Temperate Zone, this area experiences significant seasonal variations in solar potential.

Seasonal Solar Performance

Summer stands out as the most productive season for solar energy in Castlebar, Connacht, with an average daily output of 4.89kWh per kW of installed solar capacity. Spring follows closely behind, generating 4.28kWh per day. These seasons offer the best conditions for solar energy production, with longer daylight hours and generally clearer skies.

However, the picture changes dramatically during autumn and winter. Autumn sees a substantial drop in production to 1.86kWh per day, while winter experiences a further decline to a mere 0.92kWh per day. This significant seasonal variation poses challenges for year-round reliance on solar energy in Castlebar.

Optimal Panel Installation

To maximize year-round solar energy production in Castlebar, Connacht, fixed solar panels should be tilted at an angle of 46 degrees facing south. This angle is calculated to capture the most sunlight throughout the year, considering the town's latitude and the Earth's orbit.

Environmental and Weather Factors

Several factors can impede solar production in Castlebar:

• Cloud cover: The region experiences frequent cloudy days, especially in autumn and winter, reducing solar efficiency.
• Rainfall: Castlebar receives significant rainfall, which can affect panel performance and require more frequent cleaning.

To mitigate these challenges, consider installing high-efficiency panels that perform better in low-light conditions. Regular panel cleaning and maintenance can help offset the impact of rainfall and dust accumulation. Additionally, incorporating a battery storage system can help balance out the seasonal variations in energy production.

While Castlebar's location is not ideal for year-round solar energy production, the strong performance during spring and summer months can still make solar PV a viable part of a diversified energy strategy. Combining solar with other renewable energy sources could provide a more consistent year-round energy supply.

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

Link: Solar PV potential in Ireland by location

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

Seasonal solar PV output for Latitude: 53.8465, Longitude: -9.2967 (Castlebar, Ireland), 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 46° South in Castlebar, Ireland

To maximize your solar PV system's energy output in Castlebar, Ireland (Lat/Long 53.8465, -9.2967) throughout the year, you should tilt your panels at an angle of 46° 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 Castlebar, Ireland

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 Castlebar, Ireland. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 46° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
37° South in Summer	57° South in Autumn	67° South in Winter	45° 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 Castlebar, Ireland

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 Castlebar, Ireland.

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 Castlebar, Ireland

Castlebar, located in County Mayo, Ireland, is situated in a diverse landscape characterized by rolling hills, lush green fields, and scattered woodlands. The town itself is nestled in a shallow valley, with gentle slopes rising on all sides. The surrounding countryside is typical of the West of Ireland, featuring a patchwork of small fields divided by hedgerows and stone walls. To the north and east of Castlebar, the terrain becomes more undulating, with small hills and ridges dotting the landscape. These areas are predominantly used for agriculture, particularly grazing livestock. The land gradually rises towards the Nephin Beg Mountains to the northwest, creating a picturesque backdrop to the town. South of Castlebar, the topography becomes slightly flatter, with occasional drumlins - small, elongated hills formed by glacial activity. This area is known for its numerous lakes and streams, including Lough Lannagh on the outskirts of the town. The River Moy, one of Ireland's premier salmon fishing rivers, has its source near Castlebar and flows northward through the region.

Solar PV Potential in the Castlebar Area

When considering areas suitable for large-scale solar PV installations near Castlebar, several factors come into play. The ideal locations would be relatively flat, south-facing areas with minimal shading from hills or trees. Based on the topography of the region, the most promising areas for solar development would likely be: The gently sloping fields to the south and southeast of Castlebar would be well-suited for solar PV installations. These areas receive good sun exposure throughout the day and have fewer geographical obstacles that could cast shadows on solar panels. The flatter lands between Castlebar and Westport, lying to the west of the town, could also be potential sites for solar farms. This area has fewer hills and a more open landscape, which is advantageous for maximizing solar energy capture. Some of the elevated areas to the north and northeast of Castlebar, particularly on the southern slopes of hills, could be suitable for solar PV. These locations might benefit from increased sun exposure due to their elevation, although careful site selection would be necessary to avoid areas with steep gradients. It's important to note that while the topography around Castlebar offers some potential for solar PV development, the region's climate, characterized by frequent cloud cover and rainfall, may present challenges for large-scale solar energy production. Any solar projects in the area would need to carefully consider these factors, along with local planning regulations and environmental impact assessments, before proceeding.

Ireland solar PV Stats as a country

Ireland ranks 83rd in the world for cumulative solar PV capacity, with 136 total MW's of solar PV installed. Each year Ireland is generating 27 Watts from solar PV per capita (Ireland ranks 61st in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in Ireland?

Yes, there are a number of incentives available for businesses wanting to install solar energy in Ireland. The Sustainable Energy Authority of Ireland (SEAI) offers grants and other financial support for businesses that wish to install solar PV systems. Additionally, the government has introduced a Feed-in Tariff scheme which pays businesses for any excess electricity they generate from their solar panels. Finally, businesses may be eligible for tax relief on the cost of installing a solar system through the Accelerated Capital Allowance Scheme.

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