Solar Panels in Redcastle, Co. Donegal
Redcastle is a village in Co. Donegal with a population of around 400. Located 44.5 km from Letterkenny, the area has a solar yield of 704 kWh/kWp. A 4kWp solar system generates approximately 2,816 kWh annually, saving an estimated €845+ per year. The SEAI grant of up to €1,800 and 0% VAT bring the net cost to €3,200–€6,200.
How much solar energy can you generate in Redcastle?
| Solar Metric | Value |
|---|---|
| Solar Yield | 704 kWh/kWp |
| 4kWp System Output | 2,816 kWh/yr |
| Sunshine Hours | 1,175 hrs/yr |
| Est. Annual Savings | €845+ |
| Household Coverage | 67% of avg use |
Solar yield calculated for Redcastle (55.16°N, 7.13°W) using PVGIS satellite data. Actual output varies by roof orientation, shading, and system specification.
Monthly Solar Output in Redcastle
kWh per month (4kWp system)
Redcastle at a Glance
| Area Data | Value |
|---|---|
| Population | 400 (Census 2022) |
| Elevation | 35 metres |
| Eircode Area | F93 |
| Dist. to Letterkenny | 44.5 km |
| Location | Inland |
| Coordinates | 55.1599°N, 7.1338°W |
Population and housing data: CSO Census 2022. Weather data: Met Eireann (Malin Head, 26.9 km).
Weather & Climate in Redcastle
Weather data from Met Eireann (Malin Head station, 26.9 km from Redcastle). 5-year average (2019–2023).
Redcastle and Renewable Energy
Redcastle is a village in Co. Donegal with a population of 400 (CSO Census 2022). It is accessible from Letterkenny (44.5 km), where most SEAI-registered installers in the county are based. The Eircode routing key for Redcastle is F93. You'll need your full Eircode when applying for the SEAI grant. Based on satellite data for this location, a 4kWp solar system generates approximately 2,816 kWh per year (704 kWh/kWp). The area has moderate rainfall (1191 mm/yr), with a mean temperature of 10.3°C.
What Redcastle homeowners gain from solar
Save on Electricity Bills
Homeowners in Redcastle can save an estimated €845+ per year on electricity with a 4kWp solar system generating 3,268 kWh annually.
Energy Independence
For homes in rural Redcastle, solar panels provide energy security and reduced reliance on the grid. Combined with a battery, you can store power for evening use.
25+ Year Lifespan
A system installed in Redcastle today will generate clean electricity for 25-30 years with minimal maintenance.
How to claim the SEAI grant in Redcastle
Homeowners in Redcastle, Co. Donegal can claim up to €1,800 from the SEAI solar PV grant (2026). Combined with 0% VAT, the net cost of a 4kWp system is typically €3,200–€6,200.
279 SEAI-registered solar installers serve Redcastle, Co. Donegal. Compare installers in Donegal or read verified reviews.
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Frequently Asked Questions About Solar Panels in Redcastle
How much do solar panels cost in Redcastle?
A 4kWp system in Redcastle typically costs €5,000-€8,000 before grants. After the €1,800 SEAI grant and 0% VAT, the net cost is €3,200-€6,200. The system generates approximately 3,268 kWh/year, paying for itself in 4-6 years.
Are solar panels worth it in Redcastle?
Yes. With estimated savings of €845+ per year, the €1,800 SEAI grant, 0% VAT, and export income of 15-25c/kWh, a solar system in Redcastle pays for itself in 4-6 years and lasts 25+ years.
What is a BER assessment and do I need one?
A Building Energy Rating (BER) assessment is required after installing solar panels to claim the SEAI grant. A BER assessor visits your home and rates its energy efficiency from A1 to G. Solar panels typically improve your BER by 1-2 grades. The assessment costs around €150-€200.
Can I get solar panels on an east or west facing roof in Redcastle?
Yes. East or west-facing roofs still produce 80-85% of the output of a south-facing roof. Many installers recommend splitting panels across east and west to spread generation throughout the day, which can actually improve self-consumption.
Can I sell excess solar electricity?
Yes. Under Ireland's Microgeneration Support Scheme, you sell surplus electricity at 15-25c/kWh. You need a smart meter (ESB Networks installs free). The first €400/year of export income is tax-free.
What is the payback period for solar panels in Redcastle?
With a net cost of €3,200-€6,200 after the SEAI grant and savings of €845+ per year plus export income, a typical solar system in Redcastle pays for itself in 4-6 years. After payback, you get 20+ years of near-free electricity.
What size solar system do I need for my home in Redcastle?
Most homes in Redcastle benefit from a 3-6 kWp system. A 4kWp system (10 panels) covers 67% of average household electricity use. Your installer will assess your roof space, orientation, and energy usage to recommend the optimal size.
Sources
- SEAI — Solar Electricity Grant
- SEAI — Find a Registered Professional
- Revenue — 0% VAT on Solar Panels
- PVGIS — EU Joint Research Centre (solar irradiance data)
- CSO — Census of Population 2022
- Met Eireann — Climate Data
Last updated: April 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
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