Solar Panels in Oldcastle, Co. Meath
Oldcastle is a small town in Co. Meath with a population of around 1,409. Located 34.2 km from Navan, the area has a solar yield of 767 kWh/kWp. A 4kWp solar system generates approximately 3,068 kWh annually, saving an estimated €920+ 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 Oldcastle?
| Solar Metric | Value |
|---|---|
| Solar Yield | 767 kWh/kWp |
| 4kWp System Output | 3,068 kWh/yr |
| Sunshine Hours | 1,315 hrs/yr |
| Est. Annual Savings | €920+ |
| Household Coverage | 73% of avg use |
Solar yield calculated for Oldcastle (53.77°N, 7.16°W) using PVGIS satellite data. Actual output varies by roof orientation, shading, and system specification.
Monthly Solar Output in Oldcastle
kWh per month (4kWp system)
Oldcastle at a Glance
| Area Data | Value |
|---|---|
| Population | 1,409 (Census 2022) |
| Households | 550 |
| Houses/Bungalows | 90% of dwellings |
| Owner-Occupied | 48% |
| Built Before 2000 | 60% |
| Avg. Rooms per Home | 5.2 |
| Elevation | 112 metres |
| Eircode Area | A82 |
| Dist. to Navan | 34.2 km |
| Location | Inland |
| Coordinates | 53.7692°N, 7.1625°W |
Population and housing data: CSO Census 2022. Weather data: Met Eireann (Mullingar, 29 km).
Weather & Climate in Oldcastle
Weather data from Met Eireann (Mullingar station, 29 km from Oldcastle). 5-year average (2019–2023).
Solar Suitability in Oldcastle
90% of dwellings in Oldcastle are houses or bungalows, making the area highly suited for rooftop solar panels. 48% of homes are owner-occupied — homeowners can apply directly for the SEAI grant. 60% of homes were built before 2000, qualifying for the SEAI solar grant (homes built and occupied before 2021 are eligible).
Oldcastle and Renewable Energy
Oldcastle is a small town in Co. Meath with a population of 1,409 (CSO Census 2022). It is accessible from Navan (34.2 km), where most SEAI-registered installers in the county are based. The Eircode routing key for Oldcastle is A82. You'll need your full Eircode when applying for the SEAI grant. According to the 2022 Census, Oldcastle has 550 households, of which 90% are houses or bungalows — well suited for rooftop solar panels. Based on satellite data for this location, a 4kWp solar system generates approximately 3,068 kWh per year (767 kWh/kWp). The area has moderate rainfall (1062 mm/yr), with a mean temperature of 9.8°C.
What Oldcastle homeowners gain from solar
Save on Electricity Bills
Homeowners in Oldcastle can save an estimated €920+ per year on electricity with a 4kWp solar system generating 3,540 kWh annually.
Energy Independence
For homes in rural Oldcastle, 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 Oldcastle today will generate clean electricity for 25-30 years with minimal maintenance.
How to claim the SEAI grant in Oldcastle
Homeowners in Oldcastle, Co. Meath 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.
329 SEAI-registered solar installers serve Oldcastle, Co. Meath. Compare installers in Meath or read verified reviews.
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Frequently Asked Questions About Solar Panels in Oldcastle
How much do solar panels cost in Oldcastle?
A 4kWp system in Oldcastle 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 3,540 kWh/year, paying for itself in 4-6 years.
Do solar panels work in winter in Meath?
Yes, solar panels generate electricity all year round. While output is lower in winter, Meath still receives usable daylight hours even in December. Annual generation figures (3,540 kWh for a 4kWp system) already account for seasonal variation.
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.
How much electricity will solar panels generate in Oldcastle?
Based on Meath county data, a 4kWp system in Oldcastle generates approximately 3,540 kWh per year, covering 73% of average household use (4,200 kWh/year). Meath receives around 1,315 sunshine hours annually.
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 I need to clean my solar panels?
In most cases, rain keeps solar panels clean enough in Ireland. If your panels are near trees or at a low angle, an annual clean may improve output by 2-5%. Never use abrasive materials. A soft brush and water is sufficient.
What happens to my solar panels if I move house in Oldcastle?
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.
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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