100KW Solar System Cost in Ireland

Joe Brennan
Oct 28, 2023

Have you ever wondered how much it would cost to power your commercial business with solar energy in Ireland? As the world shifts towards sustainable energy sources, understanding the financial implications of such a transition becomes crucial for business owners.

This blog is designed to highlight the cost of a 100-KW solar system, which is enough for a business to run in Ireland. So, in this comprehensive guide, we'll explore the various factors that influence the cost of a 100 KW solar system in Ireland, the cost breakdown, and the return on investment you can expect.

Dive in to make an informed decision for your business's sustainable future.

Factors Affecting the Cost of a 100KW Solar System in Ireland

Let's have a look at the factors affecting the cost of a 100 KW solar system in Ireland:

Type and Size of the System

The type and size of the solar system you choose play a pivotal role in determining the overall cost. There are various types of solar panels available, such as monocrystallinepolycrystalline, and thin-film panels. Each comes with its own set of advantages, efficiency rates, and price points.

Furthermore, the size of the system directly impacts the cost. A 100-KW system, being substantial in size, will naturally be more expensive than smaller systems. However, it's essential to understand that larger systems often provide better economies of scale, potentially offering more value for each unit of energy produced.

Quality of Panels

The quality of the solar panels chosen is a significant factor in the cost equation. Premium panels, while having a higher upfront cost, often boast better efficiency, durability, and longevity. These high-quality panels can capture more sunlight and convert it into electricity more effectively, ensuring better returns in the long run.

On the other hand, opting for cheaper panels might save you money initially, but they might not be as efficient or long-lasting. This could result in higher maintenance costs and a need for replacement sooner than with premium panels, affecting the overall return on investment.

Installation Costs

Installation costs can vary widely based on several factors. The complexity of the installation, the location of your property, and the solar installer's expertise all play a role in determining this cost. For instance, installations on complex roof structures or in remote locations might incur additional costs.

Moreover, the choice of solar installer is crucial. Established and reputable installers might charge more, but they often bring expertise, experience, and guarantees that can ensure a smooth and efficient installation process, saving potential future costs related to maintenance or system inefficiencies.

Incentives and Grants

The Irish government, understanding the importance of renewable energy, offers various incentives and grants to promote solar energy adoption. The Sustainable Energy Authority of Ireland (SEAI) provides grants that can significantly reduce the initial investment required for solar installations.

While these grants can substantially offset the installation costs, it's essential to be aware of the eligibility criteria and application processes. Staying informed and taking advantage of these incentives can make solar energy a more affordable and attractive proposition for businesses.

Cost Breakdown of a 100KW Solar System in Ireland

Investing in a 100KW solar system in Ireland is a significant financial commitment, with the total cost expected to be around €225,000. To better understand where this investment goes, let's break down the costs associated with such a system:

Solar Panels

The solar panels are the main parts that catch the sun's rays and turn them into power. For a system of this size, you'll need a lot of panels. The cost for these panels, depending on their quality and type, can be around €157,500.

This is a big chunk, about 70% of the total cost, but it's the most important part. Without good panels, you won't get as much power.


Once the panels make electricity, it's in a form that we can't use in our buildings. The inverters change it into a form we can use. For a system of this much size, you'll need strong inverters. This might cost around €22,500, which is about 10% of the total cost.

Mounting Systems and Infrastructure

The panels need to be held up by something, right? Whether they're on your roof or on the ground, you'll need strong frames to hold them. This can add about €11,250 to the bill, which is 5% of the total cost.

Wiring and Electrical Connections

All the panels and inverters need to be connected with wires. And these wires need to be safe and strong. This could cost around €11,250, another 5% of the total cost.

Installation and Labour

Even if you buy all the parts, you'll need experts to come and set it all up. This might be around €16,875. It's a bit more, about 7.5% of the total cost, because it's a big job and needs a lot of skilled work.

Additional Components

There might be some extra bits and pieces you want, like systems to check how well your panels are doing. This might add another €3,375, which is 1.5% of the total cost.

Permits and Other Costs

Before you can start, you might need some permissions or paperwork. This can add up, maybe around €2,250, which is 1% of the total cost.

While the upfront cost of a 100KW solar system in Ireland might seem substantial, it's essential to understand that each component plays a crucial role in ensuring the system's efficiency, longevity, and return on investment.

Financial Returns on Investment for a 100-KW Solar System

Investing in a solar system is not just about reducing your carbon footprint; it's also a smart financial move. Let's explore the financial benefits of a 100-KW solar system:

Savings on Energy Bills

With a 100-KW system, you can generate a significant amount of your own electricity. This means you'll be buying less from the grid, leading to big savings on your monthly bills. Over time, these savings can add up to a large amount, making the initial investment worthwhile.

Feed-in Tariffs

If your system is producing more electricity than you need, you can sell the excess back to the grid. This can provide an additional source of income, further reducing the payback period of your investment.

SEAI Grant

The Sustainable Energy Authority of Ireland (SEAI) offers a generous grant for businesses looking to invest in solar energy. For a 100KW system, you can receive a grant of €22,600. This significantly reduces the initial cost, making solar energy even more attractive.

Increased Property Value

Properties equipped with solar systems often see an increase in their market value. If you ever decide to sell or lease your commercial space, having a solar system can be a strong selling point.

Long-term Price Security

With your own solar system, you're less affected by the rising costs of electricity. You'll be generating your own power, protecting you from price hikes in the energy market.

So, with savings on energy bills, feed-in tariffs, the SEAI grant, and other advantages, the 100 KW system can pay for itself in a few years, making it a wise investment for the future.

Why Choose Going Solar for Your Commercial PV System Installation?

When it comes to solar installations, especially for commercial properties, the choice of the installer can make all the difference. Here's why Going Solar stands out as the best choice for your commercial PV system installation:

Expertise and Experience

At Going Solar, we've been in the solar industry for years, successfully completing numerous commercial installations. Our team is equipped with the knowledge and skills to handle complex installations, ensuring optimal performance.

Comprehensive Consultation

We understand that every business has unique energy needs. Our experts provide a thorough consultation, understanding your requirements and suggesting the best solar solutions tailored for your business.

Quality Assurance

We believe in delivering only the best. Going Solar partners with top-tier manufacturers, ensuring that you receive high-quality panels, inverters, and other components that last for years.

Transparent Pricing

No hidden charges, no surprise costs. We provide a clear and transparent quote, ensuring you know exactly what you're paying for.

Seamless Installation

Our trained professionals ensure a hassle-free installation process, coordinating with your business operations to minimise disruptions.


Choosing a 100-KW solar system is a big step towards powering your business with clean energy. It's not just about saving money; it's about making a positive impact on our planet. With all the benefits that come with solar energy, especially with a powerful 100 KW system, your business is set to shine brighter than ever. And with Going Solar by your side, you're ensured a seamless, efficient, and beneficial transition.

Ready to illuminate your business with clean, renewable energy? Reach out to Going Solar today and take the first step towards a brighter, more sustainable tomorrow.

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Frequently Asked Questions

What is the average cost of a 100-kW solar system in Ireland?

The cost of a 100-kW solar system in Ireland can range from €200,000 to €225,000. However, long-term savings and incentives can help balance out these upfront expenses.

How long do solar panels last in Ireland?

Solar panels in Ireland generally have a lifespan of 25 to 30 years. Their efficiency may gradually decrease over time, but with regular maintenance and cleaning, their longevity can be maximised.

How many solar panels do I need to run my business in Ireland?

The number of panels required depends on the energy consumption of your business and the efficiency of the panels. For a 100-KW system, you would need a significant number of panels to meet this capacity.

What additional components and equipment are required for a 100 kW solar system?

Additional components and equipment may include inverters, which convert the direct current (DC) generated by the solar panels into alternating current (AC) for use in your home. You may also need mounting systems to securely attach the panels to your roof or ground, as well as wiring and electrical connections.

Are there any government grants or incentives available for installing a 100 kW solar system?

Yes, homeowners can take advantage of government grants and incentives, such as the SEAI grant and the Renewable Electricity Support Scheme (RESS), to reduce the initial cost of installing a 100 kW solar system.

Can a 100-kW solar system power a large business?

Yes, a 100 kW solar system can generate enough electricity to power a large business, making it an excellent choice for businesses looking to reduce their energy costs and environmental impact.

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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.