Solar Panels in Castlemahon, Co. Limerick
Castlemahon is a village in Co. Limerick with a population of around 400. Located 36.4 km from Limerick, the area has a solar yield of 783 kWh/kWp. A 4kWp solar system generates approximately 3,132 kWh annually, saving an estimated €940+ 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 Castlemahon?
| Solar Metric | Value |
|---|---|
| Solar Yield | 783 kWh/kWp |
| 4kWp System Output | 3,132 kWh/yr |
| Sunshine Hours | 1,426 hrs/yr |
| Est. Annual Savings | €940+ |
| Household Coverage | 75% of avg use |
Solar yield calculated for Castlemahon (52.43°N, 9.00°W) using PVGIS satellite data. Actual output varies by roof orientation, shading, and system specification.
Monthly Solar Output in Castlemahon
kWh per month (4kWp system)
Castlemahon at a Glance
| Area Data | Value |
|---|---|
| Population | 400 (Census 2022) |
| Houses/Bungalows (Co. Limerick avg.) | 79% of dwellings |
| Owner-Occupied (Co. Limerick avg.) | 53% |
| Built Before 2000 (Co. Limerick avg.) | 70% |
| Avg. Rooms per Home (Co. Limerick avg.) | 5.1 |
| Elevation | 61 metres |
| Eircode Area | V42 |
| Dist. to Limerick | 36.4 km |
| Location | Inland |
| Coordinates | 52.4278°N, 9.0005°W |
Population and housing data: CSO Census 2022. Weather data: Met Eireann (Shannon Airport, 29.7 km).
Weather & Climate in Castlemahon
Weather data from Met Eireann (Shannon Airport station, 29.7 km from Castlemahon). 5-year average (2019–2023).
Solar Suitability in Castlemahon
Across Co. Limerick, 79% of dwellings are houses or bungalows, with good potential for rooftop solar installations. 53% of homes are owner-occupied — homeowners can apply directly for the SEAI grant. 70% of homes were built before 2000, qualifying for the SEAI solar grant (homes built and occupied before 2021 are eligible).
Castlemahon and Renewable Energy
Castlemahon is a village in Co. Limerick with a population of 400 (CSO Census 2022). It is accessible from Limerick (36.4 km), where most SEAI-registered installers in the county are based. The Eircode routing key for Castlemahon is V42. You'll need your full Eircode when applying for the SEAI grant. Across the wider Limerick area, 79% of dwellings are houses or bungalows and 53% are owner-occupied (Census 2022). Homeowners in Castlemahon with a south, east, or west-facing roof are well positioned for solar panels. Based on satellite data for this location, a 4kWp solar system generates approximately 3,132 kWh per year (783 kWh/kWp). The area has moderate rainfall (1078 mm/yr), with a mean temperature of 11°C.
What Castlemahon homeowners gain from solar
Save on Electricity Bills
Homeowners in Castlemahon can save an estimated €940+ per year on electricity with a 4kWp solar system generating 3,476 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.
Energy Independence
For homes in rural Castlemahon, 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 Castlemahon today will generate clean electricity for 25-30 years with minimal maintenance.
How to claim the SEAI grant in Castlemahon
Homeowners in Castlemahon, Co. Limerick 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 Limerick
SEAI registered solar panel installers covering Limerick.
Top Rated Solar Installers Near Castlemahon
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Frequently Asked Questions About Solar Panels in Castlemahon
How much do solar panels cost in Castlemahon?
A 4kWp system in Castlemahon 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 3,476 kWh/year, paying for itself in 4-6 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.
Do solar panels increase property value in Castlemahon?
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 Castlemahon is a long-term investment in your property.
How does shading affect solar panels in Castlemahon?
Shading from trees, chimneys, or nearby buildings can reduce output significantly. Modern systems use optimisers or microinverters so that shading on one panel doesn't drag down the whole system. Your installer will assess shading during the site survey.
Are solar panels worth it in Castlemahon?
Yes. With estimated savings of €940+ per year, the €1,800 SEAI grant, 0% VAT, and export income of 15-25c/kWh, a solar system in Castlemahon pays for itself in 4-6 years and lasts 25+ years.
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 Castlemahon?
With a net cost of €3,200-€6,200 after the SEAI grant and savings of €940+ per year plus export income, a typical solar system in Castlemahon pays for itself in 4-6 years. After payback, you get 20+ years of near-free electricity.
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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