FAQs About Solar Panels in Ireland (2025 Edition)

Solar panels have become one of the most talked-about home upgrades in Ireland, and with good reason. As energy prices continue to rise and government grants remain strong, more homeowners than ever are considering solar power. But with interest comes questions — lots of them.

Here are some of the most frequently asked questions (FAQs) about solar panels in Ireland in 2025, along with clear, up-to-date answers to help you make informed decisions.

1. Are solar panels worth it in Ireland?

Yes! Especially in 2025. Thanks to SEAI grants, improving solar technology, and rising electricity prices, the return on investment is stronger than ever. Most homeowners in Ireland can see a payback period of 6–10 years, depending on system size, energy use, and available sunlight.

2. Do solar panels work well in Ireland’s cloudy weather?

Absolutely. Solar panels don’t require constant sunshine to work, they generate electricity from daylight, not just direct sunlight. While performance is slightly reduced on overcast days, Ireland receives more than enough solar radiation for PV systems to be effective and worthwhile.

3. How much do solar panels cost in Ireland in 2025?

Costs vary depending on system size and components, but as a rough guide:

• A typical 4kWp system: €6,500 – €8,500 before grants.
• SEAI grants offer up to €1,800 in support.
• A hybrid inverter and battery can add €3,000–€5,000 to the system.

Always get quotes from reputable installers, like WattCharger, to ensure you're comparing like-for-like systems.

4. How long do solar panels last?

Modern solar panels typically last 25–30 years. While performance will gradually degrade over time, most panels still operate at 80–85% of their original efficiency after 25 years. Inverters may need replacing after 10–15 years, depending on the model.

5. Do I need planning permission for solar panels in Ireland?

In most cases, no. Residential solar installations are exempt from planning permission as long as they meet certain conditions (e.g. not exceeding 12m² on the front of a house, or not being installed in protected areas). However, it's wise to check with your local authority if you’re unsure.

6. Can I install solar panels on a flat roof or apartment?

Yes, you can install solar panels on a flat roof using angled mounting frames to optimise exposure to sunlight. If you live in an apartment, things can be trickier. You’ll likely need permission from your building management company or residents’ association.

7. Do solar panels require a lot of maintenance?

Solar PV systems require very little maintenance. Rain typically keeps panels clean, but an annual inspection and occasional cleaning can ensure they remain efficient. Monitoring systems can alert you to any performance drops or faults.

8. Can I add a battery later?

Yes. Many homeowners choose to install a battery-ready inverter now and add a battery when budget or electricity usage increases. This flexible approach means you can future-proof your system without the full upfront cost.

9. Will I still have electricity during a power cut?

Not usually, unless you have a home storage battery system with backup functionality. Most standard grid-tied systems shut down during a power outage for safety reasons. With a compatible battery, however, you can continue to use stored energy during blackouts.

10. What’s the difference between solar PV and solar thermal?

• Solar PV (photovoltaic) generates electricity from daylight.
• Solar thermal heats water using the sun’s energy.

In 2025, PV systems are more popular due to their flexibility, grant support, and year-round usefulness. Many homes still use a combination of solar PV and immersion diverters to heat water efficiently.

11. How much can I save on electricity bills with solar panels?

Savings vary based on system size and energy usage. A well-sized PV system can reduce your annual electricity bill by 40–60%, or even more with battery storage and smart usage habits. In Dublin and Cork, this can mean €600–€1,200 per year in savings.

12. Can I sell excess solar power back to the grid?

Yes. With the Clean Export Guarantee (CEG), electricity providers in Ireland pay homeowners for surplus energy sent to the grid. While rates vary, this can help shorten your system’s payback period and reduce waste.

13. Can solar panels power my EV?

Absolutely. Pairing solar panels with an electric vehicle is a great way to cut fuel costs and emissions. With a smart charger like the Zappi, you can prioritise charging your EV with solar power whenever it’s available.

14. Are SEAI grants still available in 2025?

Yes. The SEAI Solar PV Grant remains one of the best incentives in Ireland:

• Up to €1,800 for eligible homeowners.
• Available for homes built before 2021.
• You must use a SEAI-registered installer like WattCharger.

15. What happens on dark winter days?

Solar output does dip during winter due to shorter days and lower sun angles. However, your system will still generate power. Battery storage and grid backup ensure your home remains powered even when generation is low.

Final Thoughts

Ireland is fast becoming a solar-powered nation, and understanding the basics helps homeowners make smarter, more sustainable decisions. Whether you're just beginning your research or ready to book an installation, these FAQs cover the most common and uncommon questions.

Need expert advice tailored to your home in Dublin, Cork, or beyond? Contact the team at WattCharger — your trusted solar installation partner in Ireland.