Solar Panels in Castlefin, Co. Donegal
Castlefin is a small town in Co. Donegal with a population of around 730. Located 19.2 km from Letterkenny, the area has a solar yield of 719 kWh/kWp. A 4kWp solar system generates approximately 2,876 kWh annually, saving an estimated €863+ 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 Castlefin?
| Solar Metric | Value |
|---|---|
| Solar Yield | 719 kWh/kWp |
| 4kWp System Output | 2,876 kWh/yr |
| Sunshine Hours | 1,175 hrs/yr |
| Est. Annual Savings | €863+ |
| Household Coverage | 68% of avg use |
Solar yield calculated for Castlefin (54.80°N, 7.60°W) using PVGIS satellite data. Actual output varies by roof orientation, shading, and system specification.
Monthly Solar Output in Castlefin
kWh per month (4kWp system)
Castlefin at a Glance
| Area Data | Value |
|---|---|
| Population | 730 (Census 2022) |
| Elevation | 8 metres |
| Eircode Area | F93 |
| Dist. to Letterkenny | 19.2 km |
| Location | Inland |
| Coordinates | 54.8027°N, 7.5952°W |
Population and housing data: CSO Census 2022. Weather data: Met Eireann (Finner, 54 km).
Weather & Climate in Castlefin
Weather data from Met Eireann (Finner station, 54 km from Castlefin). 5-year average (2019–2023).
Castlefin and Renewable Energy
Castlefin is a small town in Co. Donegal with a population of 730 (CSO Census 2022). It is a short drive from Letterkenny (19.2 km), where most SEAI-registered installers in the county are based. The Eircode routing key for Castlefin 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 2,876 kWh per year (719 kWh/kWp). The area has higher rainfall (1246 mm/yr), with a mean temperature of 10.4°C.
What Castlefin homeowners gain from solar
Save on Electricity Bills
Homeowners in Castlefin can save an estimated €863+ per year on electricity with a 4kWp solar system generating 3,268 kWh annually.
SEAI Grant: Up to €1,800
Get up to €1,800 back from SEAI. The grant is available for homes built before 2021. No means testing. Apply online at seai.ie.
0% VAT on Installation
Residential solar installations are zero-rated for VAT since May 2023, saving approximately €1,000 on a typical system.
Earn from Excess Energy
Sell surplus electricity at 15-25c/kWh through the Microgeneration Support Scheme. The first €400/year is tax-free.
Increase Property Value
Solar panels improve your BER rating and can add up to 4% to your property value.
25+ Year Lifespan
A system installed in Castlefin today will generate clean electricity for 25-30 years with minimal maintenance.
How to claim the SEAI grant in Castlefin
Homeowners in Castlefin, Co. Donegal can apply for the SEAI solar PV grant. The maximum grant of €1,800 is confirmed for 2026.
| System Size | Grant Amount | Typical Net Cost |
|---|---|---|
| 2 kWp | €1,400 | €2,000 - €3,000 |
| 3 kWp | €1,600 | €2,500 - €4,000 |
| 4 kWp+ | €1,800 (max) | €3,200 - €6,200 |
Solar Installers in Donegal
SEAI registered solar panel installers covering Donegal.
Top Rated Solar Installers Near Castlefin
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Frequently Asked Questions About Solar Panels in Castlefin
How much do solar panels cost in Castlefin?
A 4kWp system in Castlefin 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.
What happens to my solar panels if I move house in Castlefin?
Solar panels stay with the property as a permanent fixture. They add value to your home for the next buyer. The SEAI grant does not need to be repaid if you sell. Your installer can transfer monitoring accounts to the new owner.
Can I add a battery to my solar system?
Yes. A home battery (typically 5-10 kWh) stores excess solar electricity for evening use. This increases your self-consumption from around 30-40% to 60-80%. Batteries currently cost €3,000-€6,000 and are not yet covered by the SEAI grant.
How long do solar panels last?
Modern solar panels are warrantied for 25-30 years and typically last even longer. Panel efficiency degrades by about 0.5% per year, so after 25 years, your panels will still produce around 87% of their original output. Inverters typically last 10-15 years and may need one replacement.
Are solar panels worth it in Castlefin?
Yes. With estimated savings of €863+ per year, the €1,800 SEAI grant, 0% VAT, and export income of 15-25c/kWh, a solar system in Castlefin pays for itself in 4-6 years and lasts 25+ years.
What roof direction is best for solar panels in Castlefin?
South-facing roofs produce the most electricity (100% of potential). South-east and south-west roofs produce around 95%. East or west-facing roofs still produce 80-85%. North-facing roofs are generally not recommended for solar panels in Ireland.
Do solar panels increase property value in Castlefin?
Yes. Solar panels improve your BER rating and can increase property value by up to 4%. Buyers increasingly look for energy-efficient homes with lower running costs. A solar system in Castlefin is a long-term investment in your property.
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: March 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
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