Solar PV in Ireland 2026 — 6 kWp Cost, Payback, and the SEAI Grant

Solar PV in Ireland 2026: 6 kWp system €9,000–€13,000 installed. No PV grant currently for new build (check SEAI for current scheme). Payback 8–12 years. For a 150 m² house: 4–6 kWp is typical. Roof needs ~28 m² of south-facing area for 4 kWp, ~42 m² for 6 kWp. In-roof PV (panels form the roof) is more expensive but architecturally cleaner. On-roof PV is cheaper and easier to retrofit. Battery storage adds €4,000–€8,000. Most self-builds skip the battery initially and add it later if needed. The inverter is typically located in the utility room or the attic. SEAI grant support varies year-on-year; check current scheme before specifying.

TL;DR

• Solar PV in Ireland 2026: 6 kWp system €9,000–€13,000 installed. No grant for new build currently. Payback 8–12 years.

• For a 150 m² house: 4–6 kWp is typical. Roof needs ~28 m² of south-facing area for 4 kWp, ~42 m² for 6 kWp.

• Battery storage adds €4,000–€8,000. Most self-builds skip the battery initially and add it later if needed.

When this matters most

You're at design stage and considering solar PV.

When this doesn't apply

The PV is installed.

Frequently asked questions

How much does solar PV cost in Ireland in 2026?

6 kWp system: €9,000–€13,000 installed. Battery storage: €4,000–€8,000. No grant currently for new build; check SEAI for current scheme.

How long does solar PV take to pay back in Ireland?

8–12 years for a 6 kWp system with no battery. With a battery: 12–15 years. With current electricity prices, the payback is shorter than 5 years ago.

What size solar PV do I need for a 150 m² house?

4–6 kWp typical. 4 kWp needs ~28 m² of south-facing roof. 6 kWp needs ~42 m². Larger systems are usually limited by roof area.

Sources

SEAI, Solar PV Grants 2026. https://www.seai.ie/grants/