Solar Panels in Castlegal, Co. Sligo
Castlegal is a small town in Co. Sligo with a population of around 500. Located 6.1 km from Sligo, 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.
Castlegal solar irradiance and generation figures
| Solar Metric | Value |
|---|---|
| Solar Yield | 704 kWh/kWp |
| 4kWp System Output | 2,816 kWh/yr |
| Sunshine Hours | 1,150 hrs/yr |
| Est. Annual Savings | €845+ |
| Household Coverage | 67% of avg use |
Solar yield calculated for Castlegal (54.32°N, 8.41°W) using PVGIS satellite data. Actual output varies by roof orientation, shading, and system specification.
Monthly Solar Output in Castlegal
kWh per month (4kWp system)
Castlegal at a Glance
| Area Data | Value |
|---|---|
| Population | 500 (Census 2022) |
| Elevation | 283 metres |
| Eircode Area | F91 |
| Dist. to Sligo | 6.1 km |
| Location | Inland |
| Coordinates | 54.3160°N, 8.4113°W |
Population and housing data: CSO Census 2022. Weather data: Met Eireann (Markree, 15.9 km).
Weather & Climate in Castlegal
Weather data from Met Eireann (Markree station, 15.9 km from Castlegal). 5-year average (2019–2023).
Renewable Energy Potential in Castlegal
Castlegal is a small town in Co. Sligo with a population of 500 (CSO Census 2022). It is conveniently close to Sligo (6.1 km), where most SEAI-registered installers in the county are based. At an elevation of 283 metres, installations in Castlegal should consider potential wind exposure when planning panel mounting. The Eircode routing key for Castlegal is F91. 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 higher rainfall (1332 mm/yr), with a mean temperature of 9.8°C.
Why Go Solar in Castlegal?
Save on Electricity Bills
Homeowners in Castlegal can save an estimated €845+ per year on electricity with a 4kWp solar system generating 3,388 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 Castlegal today will generate clean electricity for 25-30 years with minimal maintenance.
SEAI Solar Grant for Castlegal Residents
Homeowners in Castlegal, Co. Sligo 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 Sligo
SEAI registered solar panel installers covering Sligo.
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Castlegal solar panel questions answered
How much do solar panels cost in Castlegal?
A 4kWp system in Castlegal 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 3,388 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.
Is my roof suitable for solar panels in Castlegal?
Most roofs are suitable. You need at least 15-20 m² of unshaded roof space for a typical 4kWp system (10 panels). South, east, or west-facing roofs work well. Your installer will assess your roof's orientation, angle, and structural suitability during a site survey.
How long does solar panel installation take?
A typical residential installation takes 1-2 days. This includes scaffolding, mounting the panels, wiring, inverter installation, and connecting to the grid. Your installer handles the ESB Networks notification (NC6 form).
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.
What is the Microgeneration Support Scheme?
The Microgeneration Support Scheme allows homeowners to sell surplus solar electricity back to the grid at 15-25c/kWh. You need a smart meter (free from ESB Networks) and a grid-connected system. The first €400/year of export income is tax-free.
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.
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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