Solar Panels in Glenswilly, Co. Donegal
Glenswilly is a village in Co. Donegal with a population of around 200. Located 10 km from Letterkenny, the area has a solar yield of 710 kWh/kWp. A 4kWp solar system generates approximately 2,840 kWh annually, saving an estimated €852+ per year. The SEAI grant of up to €1,800 and 0% VAT bring the net cost to €3,200–€6,200.
Glenswilly solar irradiance and generation figures
| Solar Metric | Value |
|---|---|
| Solar Yield | 710 kWh/kWp |
| 4kWp System Output | 2,840 kWh/yr |
| Sunshine Hours | 1,175 hrs/yr |
| Est. Annual Savings | €852+ |
| Household Coverage | 68% of avg use |
Solar yield calculated for Glenswilly (54.94°N, 7.89°W) using PVGIS satellite data. Actual output varies by roof orientation, shading, and system specification.
Monthly Solar Output in Glenswilly
kWh per month (4kWp system)
Glenswilly at a Glance
| Area Data | Value |
|---|---|
| Population | 200 (Census 2022) |
| Dist. to Letterkenny | 10 km |
| Location | Inland |
| Coordinates | 54.9411°N, 7.8884°W |
Population and housing data: CSO Census 2022. Weather data: Met Eireann (Finner, 54.7 km).
Weather & Climate in Glenswilly
Weather data from Met Eireann (Finner station, 54.7 km from Glenswilly). 5-year average (2019–2023).
Renewable Energy Potential in Glenswilly
Glenswilly is a village in Co. Donegal with a population of 200 (CSO Census 2022). It is a short drive from Letterkenny (10 km), where most SEAI-registered installers in the county are based. Based on satellite data for this location, a 4kWp solar system generates approximately 2,840 kWh per year (710 kWh/kWp). The area has higher rainfall (1246 mm/yr), with a mean temperature of 10.4°C.
Why Go Solar in Glenswilly?
Save on Electricity Bills
Homeowners in Glenswilly can save an estimated €852+ 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 Glenswilly today will generate clean electricity for 25-30 years with minimal maintenance.
SEAI Solar Grant for Glenswilly Residents
Homeowners in Glenswilly, 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 Glenswilly
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Glenswilly solar panel questions answered
How much do solar panels cost in Glenswilly?
A 4kWp system in Glenswilly 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.
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.
What is the difference between solar PV and solar thermal?
Solar PV panels generate electricity from sunlight. Solar thermal panels heat water directly. For most Irish homes, solar PV is the better investment: it's more versatile, qualifies for the SEAI grant, and you can sell excess electricity. Solar thermal only heats water.
Do solar panels work in winter in Donegal?
Yes, solar panels generate electricity all year round. While output is lower in winter, Donegal still receives usable daylight hours even in December. Annual generation figures (3,268 kWh for a 4kWp system) already account for seasonal variation.
What happens during a power cut?
Standard grid-tied solar systems shut down during a power cut for safety reasons (to protect ESB workers). If you need backup power, you can install a hybrid inverter with battery storage that provides power during outages.
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 Glenswilly?
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.
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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