Solar Panels in Knock, Co. Mayo
Knock is a small town in Co. Mayo with a population of around 1,029. Located 25.2 km from Castlebar, the area has a solar yield of 748 kWh/kWp. A 4kWp solar system generates approximately 2,992 kWh annually, saving an estimated €898+ per year. The SEAI grant of up to €1,800 and 0% VAT bring the net cost to €3,200–€6,200.
What is the solar potential in Knock?
| Solar Metric | Value |
|---|---|
| Solar Yield | 748 kWh/kWp |
| 4kWp System Output | 2,992 kWh/yr |
| Sunshine Hours | 1,105 hrs/yr |
| Est. Annual Savings | €898+ |
| Household Coverage | 71% of avg use |
Solar yield calculated for Knock (53.79°N, 8.92°W) using PVGIS satellite data. Actual output varies by roof orientation, shading, and system specification.
Monthly Solar Output in Knock
kWh per month (4kWp system)
Knock at a Glance
| Area Data | Value |
|---|---|
| Population | 1,029 (Census 2022) |
| Households | 435 |
| Houses/Bungalows | 86% of dwellings |
| Owner-Occupied | 54% |
| Built Before 2000 | 41% |
| Avg. Rooms per Home | 5.1 |
| Elevation | 94 metres |
| Eircode Area | F12 |
| Dist. to Castlebar | 25.2 km |
| Location | Inland |
| Coordinates | 53.7948°N, 8.9194°W |
Population and housing data: CSO Census 2022. Weather data: Met Eireann (Claremorris, 10.5 km).
Weather & Climate in Knock
Weather data from Met Eireann (Claremorris station, 10.5 km from Knock). 5-year average (2019–2023).
Solar Suitability in Knock
86% of dwellings in Knock are houses or bungalows, making the area highly suited for rooftop solar panels. 54% of homes are owner-occupied — homeowners can apply directly for the SEAI grant.
Solar Power in Knock, Co. Mayo
Knock is a small town in Co. Mayo with a population of 1,029 (CSO Census 2022). It is accessible from Castlebar (25.2 km), where most SEAI-registered installers in the county are based. The Eircode routing key for Knock is F12. You'll need your full Eircode when applying for the SEAI grant. According to the 2022 Census, Knock has 435 households, of which 86% are houses or bungalows — well suited for rooftop solar panels. Based on satellite data for this location, a 4kWp solar system generates approximately 2,992 kWh per year (748 kWh/kWp). The area has higher rainfall (1376 mm/yr), with a mean temperature of 10°C.
Advantages of Solar Energy for Knock Homeowners
Save on Electricity Bills
Homeowners in Knock can save an estimated €898+ per year on electricity with a 4kWp solar system generating 3,364 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 Knock today will generate clean electricity for 25-30 years with minimal maintenance.
Solar grants available in Knock
Homeowners in Knock, Co. Mayo 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 Mayo
SEAI registered solar panel installers covering Mayo.
Top Rated Solar Installers Near Knock
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Areas around Knock we serve
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Your solar questions for Knock
How much do solar panels cost in Knock?
A 4kWp system in Knock 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 3,364 kWh/year, paying for itself in 4-6 years.
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 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.
How much electricity will solar panels generate in Knock?
Based on Mayo county data, a 4kWp system in Knock generates approximately 3,364 kWh per year, covering 71% of average household use (4,200 kWh/year). Mayo receives around 1,105 sunshine hours annually.
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 Knock?
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.
What size solar system do I need for my home in Knock?
Most homes in Knock benefit from a 3-6 kWp system. A 4kWp system (10 panels) covers 71% of average household electricity use. Your installer will assess your roof space, orientation, and energy usage to recommend the optimal size.
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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