Solar Panels Ireland Cost Calculator
This solar panel calculator Ireland estimates your savings based on your county, roof orientation, system size, and current electricity bill. All calculations use county-level Irish solar irradiance data and current SEAI grant rates.
Last updated May 2026
Estimated 25-Year Net Return
€17,229
After system cost of €6,846 (grant applied) and one inverter replacement (€1,500, ~year 12–15)
Estimates based on county-level PVGIS irradiance data, electricity at 35c/kWh, export at 19c/kWh, 40% self-consumption ratio, and current SEAI grant rates. 0% VAT included. 25-year return includes one inverter replacement (€1,500). Actual results vary by exact location, roof pitch, shading, panel efficiency, and electricity price changes.
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How Much Can Solar Panels Save You in Ireland?
Self-Consumption
Around 40% of the electricity your panels generate is used directly in your home, displacing grid electricity at 35c/kWh. This is where the biggest savings come from.
Export Income
Surplus electricity is exported to the grid and paid at 15–32c/kWh depending on your supplier. The first €400/year of export income is tax-free until end of 2028.
SEAI Grant + 0% VAT
The SEAI grant of up to €1,800 and 0% VAT reduce your upfront cost significantly. A typical 4.4 kWp system costs €8,300–€9,000 before grant and €6,500–€7,200 after the grant.
How much do solar panels save per month?
A typical 4.4 kWp solar panel system in Ireland saves around €83 per month on average across the year. Monthly savings vary seasonally: roughly €99 in summer (May–August) when output peaks, €66 in spring and autumn, and €66 in winter (December–February). These figures include both self-consumption savings (avoiding 35c/kWh grid electricity) and export income (15–32c/kWh for surplus). Annual savings total around €991 for a typical system.
How many solar panels do I need for a 3-bed house?
A typical 3-bed semi-detached house in Ireland uses around 4,200 kWh of electricity per year. To cover 80–100% of this, you need 8–10 solar panels (3.5–4.4 kWp). A 10-panel system at 440W each gives 4.4 kWp, which maximises the €1,800 SEAI grant and generates approximately 3,900 kWh per year at the national average yield. The net cost after grant is typically €5,800–€7,200.
| House Type | Annual Usage | Panels Needed | System Size | Net Cost |
|---|---|---|---|---|
| 2-bed apartment | 3,000 kWh | 6–8 | 2.6–3.5 kWp | €4,980–€6,800 |
| 3-bed semi | 4,200 kWh | 8–10 | 3.5–4.4 kWp | €5,800–€7,200 |
| 4-bed detached | 5,500 kWh | 12–14 | 5.3–6.2 kWp | €7,400–€9,700 |
| Large home + EV | 7,000+ kWh | 16–20 | 7.0–8.8 kWp | €10,000–€13,700 |
Based on 440W panels, national average yield of 884 kWh/kWp, and current SEAI grant rates. Use the calculator above for a county-specific estimate.
What assumptions does the solar calculator use?
These are indicative estimates. Actual performance depends on exact location, roof pitch and condition, shading, panel type, inverter efficiency, and electricity price changes over time. Adding battery storage increases self-consumption to 75-85% but adds to the upfront cost.
Frequently Asked Questions About Solar Savings
How many solar panels do I need?
Most Irish homes need 8–12 solar panels (3.5–5.3 kWp). The sweet spot is 10 panels (4.4 kWp), which maximises the SEAI grant at €1,800 and covers 80–100% of average household electricity use. Larger homes with EVs or heat pumps may benefit from 14–20 panels.
How many solar panels to power a house?
To fully power an average Irish house using 4,200 kWh/year, you need approximately 10 panels (4.4 kWp), which generates around 3,900 kWh per year. With a battery, self-consumption increases to 75–85%. In practice, most homes remain connected to the grid for cloudy periods and winter evenings.
How many solar panels do I need for my home in Ireland?
It depends on your electricity usage and roof space. For a typical 3-bed semi using 4,200 kWh/year, 10 panels (4.4 kWp) is the recommended size. Use the calculator above to get a county-specific estimate based on your actual bill and roof orientation.
How much are solar panels?
Solar panels in Ireland are priced by system size, with smaller systems carrying higher per-kWp costs because of fixed installation overheads. A typical 10-panel (4.4 kWp) system costs €8,300–€9,000 before the grant, or €6,500–€7,200 after the €1,800 SEAI grant. 0% VAT applies to residential installations. Prices vary by installer and equipment.
How much does solar panels cost?
A residential solar panel system in Ireland costs €4,980–€15,200 after the SEAI grant, depending on system size. The most popular 4.4 kWp system (10 panels) costs €6,500–€7,200 net. Adding a 5 kWh battery adds €3,000–€4,500.
How much to install solar panels?
Installation costs are included in the system price. Irish installers quote supply-and-install as a single package. A typical 4.4 kWp system costs €8,300–€9,000 installed (before the SEAI grant of €1,800). There is no separate installation fee. 0% VAT applies to residential installations.
Are solar panels worth it?
Yes. In Ireland, a typical 4.4 kWp solar panel system pays for itself in typically 6–8 years and generates free electricity for 25+ years. With the SEAI grant (up to €1,800), 0% VAT, and feed-in tariffs (15–32c/kWh), the 25-year return is typically 2–3× the initial investment.
Are solar panels worth it in Ireland?
Yes, solar panels are worth it in Ireland. Despite the climate, Ireland gets enough sunlight for solar panels to generate 80–100% of a typical home's electricity. With the SEAI grant of up to €1,800, 0% VAT, and feed-in tariffs, payback is typically 6–8 years. Over 160,000+ Irish homes have already installed solar.
Sources
- SEAI — Solar Electricity Grant Rates
- CRU — Understanding Your Electricity Bill
- ESB Networks — Microgeneration Connection
- Revenue — 0% VAT on Solar Panels
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
John Rooney is the founder of Solar Info and has been covering the Irish solar energy market since 2023. He fact-checks all content against official SEAI data and maintains relationships with SEAI-registered installers across Ireland.
Get an Accurate Quote for Your Home
This calculator gives estimates. For an accurate quote based on your specific roof, get in touch with SEAI-registered installers.