Solar Panels in Castlewarren, Co. Kilkenny
Castlewarren is a village in Co. Kilkenny with a population of around 400. Located 10.2 km from Kilkenny, the area has a solar yield of 905 kWh/kWp. A 4kWp solar system generates approximately 3,620 kWh annually, saving an estimated €1086+ per year. The SEAI grant of up to €1,800 and 0% VAT bring the net cost to €6,500–€7,200.
How much solar energy can you generate in Castlewarren?
| Solar Metric | Value |
|---|---|
| Solar Yield | 905 kWh/kWp |
| 4kWp System Output | 3,620 kWh/yr |
| Sunshine Hours | 1,360 hrs/yr |
| Est. Annual Savings | €1086+ |
| Household Coverage | 86% of avg use |
Based on county-level solar data for Kilkenny. Actual output varies by roof orientation, shading, and system specification.
Castlewarren at a Glance
| Area Data | Value |
|---|---|
| Population | 400 (Census 2022) |
| Elevation | 219 metres |
| Eircode Area | R21 |
| Dist. to Kilkenny | 10.2 km |
| Location | Inland |
| Coordinates | 52.6935°N, 7.1076°W |
Population and housing data: CSO Census 2022. Weather data: Met Eireann (Oak Park, 22.7 km).
Weather & Climate in Castlewarren
Weather data from Met Eireann (Oak Park station, 22.7 km from Castlewarren). 5-year average (2019–2023).
Castlewarren and Renewable Energy
Castlewarren is a village in Co. Kilkenny with a population of 400 (CSO Census 2022). It is a short drive from Kilkenny (10.2 km), where most SEAI-registered installers in the county are based. At an elevation of 219 metres, installations in Castlewarren should consider potential wind exposure when planning panel mounting. The Eircode routing key for Castlewarren is R21. You'll need your full Eircode when applying for the SEAI grant. The area receives around 1,360 sunshine hours annually, allowing a 4kWp solar system to generate approximately 3,620 kWh per year. The area has relatively low rainfall (867 mm/yr), with a mean temperature of 10.5°C.
What Castlewarren homeowners gain from solar
Save on Electricity Bills
Homeowners in Castlewarren can save an estimated €1086+ per year on electricity with a 4kWp solar system generating 3,620 kWh annually.
Top Solar County in Ireland
Co. Kilkenny ranks #7 in Ireland for solar yield with 905 kWh/kWp. Homes in Castlewarren benefit from some of the best solar conditions in the country.
25+ Year Lifespan
A system installed in Castlewarren today will generate clean electricity for 25-30 years with minimal maintenance.
How to claim the SEAI grant in Castlewarren
Homeowners in Castlewarren, Co. Kilkenny 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€6,500–€7,200.
323 SEAI-registered solar installers serve Castlewarren, Co. Kilkenny. Compare installers in Kilkenny or read verified reviews.
Solar Installers Serving Castlewarren
SEAI registered solar panel installers covering Castlewarren, Co. Kilkenny.
RNL Electrical & Renewable Energies Ltd
carlow, cavan, clare +23 more
Energysmart Renewables Limited
carlow, cavan, clare +23 more
ePower
carlow, cavan, clare +23 more
Top Rated Solar Installers Near Castlewarren
Read verified reviews from solar panel installers serving Castlewarren, Co. Kilkenny.
Towns near Castlewarren for solar installation
Also serving nearby areas in Kilkenny:
Find Solar Installers in Kilkenny
Browse 323 SEAI-registered installers covering Castlewarren and all of Kilkenny.
Solar Panel Costs Ireland
Full cost breakdown by system size, what affects price, and ROI timeline.
Best Solar Panels Ireland
Compare solar panels, inverters, and batteries used by Irish installers.
Frequently Asked Questions About Solar Panels in Castlewarren
How much do solar panels cost in Castlewarren?
A 4.4 kWp system in Castlewarren typically costs €8,300–€9,000 before grants. After the €1,800 SEAI grant and 0% VAT, the net cost is €6,500–€7,200. The system generates approximately 3,620 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.
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 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.
How do I get the SEAI grant in Castlewarren?
Apply online at seai.ie with your MPRN and Eircode. Use an SEAI-registered installer. Do not start work before your Letter of Offer. After installation, complete a BER assessment. The grant is paid to your bank within 4-6 weeks.
How much electricity will solar panels generate in Castlewarren?
Based on Kilkenny county data, a 4kWp system in Castlewarren generates approximately 3,620 kWh per year, covering 86% of average household use (4,200 kWh/year). Kilkenny receives around 1,360 sunshine hours annually.
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.
Can you go off-grid with solar in Castlewarren?
Fully off-grid setups are rare in Castlewarren. Most homes stay grid-connected and sell surplus back through the Microgeneration Support Scheme. A hybrid inverter with 10-20 kWh of battery storage covers evenings and power cuts, which is what most people searching "off-grid" actually want. A true off-grid system needs a much larger array and battery bank, and you lose the grant-supported export income.
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: August 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Get a Free Solar Quote in Castlewarren
Connect with SEAI-registered installers covering Castlewarren, Co. Kilkenny.