20 KWh Solar System Cost in Ireland

Joe Brennan
Mar 28, 2024

Looking into solar energy in Ireland? Many people are curious about the real cost with a 20 kWh solar setup. Switching to solar could cut down on your electric bills and help the planet too. With the growing interest in clean energy, many Irish homeowners and businesses are considering solar power as a sustainable and cost-effective option. 

However, exploring the cost of solar energy can seem challenging at first, especially when it comes to understanding the costs involved. This blog is here to explain everything you need to know about setting up a 20 kWh solar system in Ireland—from the initial setup costs to the savings you can expect. Our aim is to provide you with clear, easy-to-understand information to help you make an informed decision. So, let’s dive right in!

What is the Cost Breakdown of a 20 kWh Solar System in Ireland?

When thinking about going solar with a 20 kWh system in Ireland, getting a clear picture of the costs involved is crucial. The price tag for a 20 kWh setup can vary widely, but here's the breakdown to give you a better idea.

Initial investment in solar panel installation

First off, the cost of solar panels and the whole installation process can vary quite a bit. For a system this size, you're looking at a starting point of around €20,000 to €40,000.

Benefits and savings from solar energy

  • Long-term Savings: Despite the initial cost, solar panels significantly reduce electric bills, with an average savings of 50% to 70%.
  • Environmental Impact: Solar energy is clean and renewable, helping to reduce carbon footprint and combat climate change.
  • Energy Independence: By generating your own electricity, you reduce dependence on fossil fuels and fluctuating energy markets.
  • Increased Property Value: Homes with solar panel installations often see an increase in property value.
  • Incentives and Rebates: Many governments offer tax incentives, rebates, and grants to offset the installation costs.
  • Contribution to the National Grid: Excess energy generated can often be sold back to the national grid, providing an additional income stream or credit on future bills. This not only offers financial benefits but also supports the community by contributing to a more sustainable energy system.

Expected bill reduction percentage

On average, solar panel installations can reduce your electric bills by 50% to 70%, depending on various factors such as the size of your system, your energy consumption, and the amount of sunlight your location receives. This significant reduction in utility costs is one of the key benefits of transitioning to solar energy.

Furthermore, consider the equipment beyond just the panels. Things like inverters, batteries for storing power, and the installation service itself all add to the cost. But they're all part of making your solar system efficient and tailored to your needs.

As we go further into the details, let's determine how much each component will cost:

What Are the Components of a 20 kWh Solar System?

There are several components that affect the total cost of a 20 kWh solar system in Ireland. Here is a complete breakdown:

Solar panels

For a 20 kWh system, you might need around 50–60 panels, depending on their efficiency. The cost of panels alone can range from €10,000 to €15,000, depending on the type and efficiency of the panels chosen.


  • String inverters: typically cost between €1,000 to €2,000 for a system of this size.
  • Micro inverters and Power Optimisers: Expect to pay 20–30% more than string inverters, so roughly €1,200 to €2,600, depending on the system's requirements.

Battery Storage

For a system with storage capabilities, adding a battery like a Tesla Power Wall (13.5 kWh capacity) might cost around €8,000 to €10,000, including installation. Larger systems may require more than one battery or a different storage solution, increasing the cost.

Mounting and racking systems

This can vary widely but typically ranges from €1,000 to €3,000, depending on the complexity of the installation.

Additional equipment

Cabling, connectors, safety switches, girds, and monitoring systems can add an additional €1,000 to €2,000 to the total cost.

What is the Total Installation Cost of a System?

The installation costs of a 20 kwh solar system may vary; however, expect to pay around €2,000 to €5,000 for labour which may include site assessment, system design, and the actual installation work. Also, note that permitting and inspection fees can add more to the total cost.

Total estimated cost

Combining these components, the total cost for a 20 kWh solar system in Ireland can range approximately from €22,000 to €37,000 before any government incentives or tax rebates. This estimate does not include potential costs for roof reinforcement or tree removal, if necessary.

Keep in mind that the specific price can change based on your home's location, the quality of the panels, and the company you choose for installation. Getting a few quotes from different providers is a smart move to find the best deal for you.

What Are the Available Government Incentives for a 20 kWh Solar System in Ireland?

The government of Ireland offers grants and incentives for solar energy, which can significantly lower your upfront costs. For example, the SEAI (Sustainable Energy Authority of Ireland) provides grants that can save thousands from the initial investment. So, it's always a good idea to check what's available.

Types of Grant Incentives for Installing 20 kWh Solar Panels

In Ireland, there are several types of grant incentives designed to make installing solar panels more affordable. These grants can significantly reduce the upfront costs, making it easier for homeowners to switch to renewable energy. Here's a look at the types of grants available and how much they might cover:

  • Solar Electricity Grant: This grant is offered by the Sustainable Energy Authority of Ireland (SEAI). For systems up to 2 kW, with an additional 2 kW allowed if your home is more energy-efficient, you can get up to €2,400. Remember, for every additional kWh of solar panels, you get an extra €900 up to 4kWh if you also install a battery storage system.
  • Battery Storage Grant: If you choose to add a battery storage system to your new or existing solar panel setup, there's more good news. The SEAI provides up to €600 for this. It's important because it lets you save solar energy, meaning you can use it even when the sun isn't shining.
  • Tax Relief: While not a grant, it's worth noting that you can also benefit from tax relief for installing solar panels. This can further decrease your costs.

Lastly, these incentives make it clear that Ireland is encouraging homeowners to adopt solar energy. By taking advantage of these grants, you can cut down on installation costs and enjoy the benefits of solar power without breaking the bank. Always check the latest details and eligibility criteria on the SEAI website or consult with a solar energy provider to make sure you get the most out of available incentives.

What Are the Benefits of These Government Incentives and Tax Release?

Ireland offers various incentives that can significantly reduce the upfront cost. The Sustainable Energy Authority of Ireland (SEAI) provides grants for solar PV installations, which could offset some of the initial investment. It's essential to check the latest available incentives, as they can change.

Remember, these figures are estimates and can vary based on a multitude of factors. It's crucial to get quotes from multiple suppliers and consider the latest government incentives to get a clear picture of the cost for your specific situation.

How Much Money Can One Save Using These Grants?

Using the grant incentives for installing 20 kWh solar panels in Ireland, one can save a significant amount of money, although the exact savings would depend on the specifics of their installation and energy usage. Here’s a rough breakdown based on the mentioned grants:

Solar Electricity Grant: 

For a system that might include up to 4 kWh of panels and a battery, the grant could cover up to €2,400 for the panels themselves, plus €900 for additional capacity if you qualify for the maximum and choose to install a battery. This totals to €3,300 for solar panels.

Battery Storage Grant: 

Adding a battery storage system could net you an additional €600.

So, combining these, the total potential savings from grants could reach up to €3,900. This does not account for any additional tax relief or benefits from selling excess electricity back to the grid, which could further enhance your savings. Remember, the final amount saved will depend on the details of your installation and the specific grants for which you qualify.

Is there Any Savings or Return on Investment (ROI)?

Absolutely, investing in a 20 kWh solar system in Ireland can bring real savings and a strong return on investment (ROI). The magic number to remember is that you can cut down on your electric bills significantly. Over time, these savings add up, making solar not just an eco-friendly choice but a smart financial move too.

Moreover, solar panels can save you thousands over their lifetime. Think about it this way: the sun's energy is free once you've got your system up and running. So, every bit of electricity your panels generate is money saved on bills. Plus, if your system produces more power than you need, you might be able to sell this extra energy back to the grid, adding to your savings.

The ROI part is pretty cool too. With the cost of electricity going up, the amount you save by generating your own power increases over time. This means the solar system pays for itself faster. After that, it’s all about the savings. Most systems are built to last 25 years or more, so we're talking long-term benefits here.

Additionally, grants and incentives from the government can lower your initial costs, boosting your ROI even further. Once you get past the setup costs, the savings start rolling in, making solar panels a smart investment for your future.

So, Going Solar in Ireland is not just about being kind to the Earth. It's also about saving money and getting a great return on your investment. So, taking the leap into solar energy looks like a win-win situation.


Exploring the potential of a 20 kWh solar system in Ireland opens doors to significant savings and a greener future. It's about understanding the upfront costs, potential savings, and return on investment, as well as the factors that influence these costs.

If you're looking to harness the power of solar energy and need expert guidance on making the best choice for your home or business, Going Solar is here to help. Reach out to us for assistance with your 20 kWh solar system needs in Ireland and take a step towards a sustainable, cost-effective energy solution today.

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Frequently Asked Questions

How much does a 20 kWh solar system cost in Ireland?

The cost of a 20 kWh solar system in Ireland can range between €20,000 to €40,000, depending on factors such as the quality of the panels and the complexity of the installation. Prices can vary, so getting quotes from several providers is advisable.

Can I get any government grants for a 20 kWh solar system in Ireland?

Yes, the Sustainable Energy Authority of Ireland (SEAI) offers grants for residential solar PV systems, which can significantly reduce the initial cost. The exact amount depends on the size of the system and eligibility criteria.

How much can I save on my electricity bill with a 20 kWh solar system?

Savings can be substantial, often running into thousands of euros over the lifespan of the system. The exact amount depends on your current electricity usage and the efficiency of your solar system.

What is the return on investment (ROI) for a 20 kWh solar system in Ireland?

The ROI can vary, but typically, solar systems pay for themselves in 7 to 10 years through savings on electricity bills and possible earnings from excess energy sold back to the grid.

Do I need planning permission to install a 20 kWh solar system in Ireland?

Solar installations of up to 12 sqm on the roof of a house do not usually need planning permission. For larger systems, it's best to check with your local council for specific regulations.

How long does it take to install a 20 kWh solar system, and how long will it last?

Installation can take a few days to a week, depending on the system's complexity and the installation site's specifics. Solar panels typically last 25-30 years, with inverters needing replacement every 10-15 years.

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*FYI, parts of this blog post were drafted by artificial technlogy. But rest assured, it's been thoroughly researched, edited, reviewed and me & my team.
Author Fahad Zahid
Founder @ Going Solar

Joe Brennan, the founder of Going Solar, is dedicated to making solar power mainstream in Ireland and meet SEAI objectives. With a focus on affordability and sustainability, he is bringing renewable energy solutions to homes, reducing costs & environmental impact.