Commercial solar panels in Ireland usually cost between €1,000 and €1,800 per kWp installed, which puts most business systems somewhere between about €13,000 for a small rooftop array and €150,000 or more for a large factory or farm. Where your project lands depends on system size, roof type and the quality of the equipment.
That headline figure is not what your business actually pays. Between the SEAI Non-Domestic Microgen Grant and the year one tax write off available to trading companies, the real cost is a good deal lower. This guide walks through the price by system size, what moves it up or down, and what you are left paying once grants and tax relief are counted.
How Much Do Commercial Solar Panels Cost in Ireland
Commercial solar is priced per kWp, which is the peak output of the system. For most Irish businesses the installed price works out at roughly €1,000 to €1,800 per kWp before VAT. Larger systems sit at the lower end, because the fixed costs of design, scaffolding and grid paperwork are spread across more panels. Smaller or more awkward installs sit higher.
As a rough guide, a business system runs from about €13,000 at the small end to €150,000 or more for a large commercial or agricultural site. Systems bigger than that, such as a utility scale array, are quoted on their own terms.
Commercial Solar Panel Costs by System Size
Costs vary from site to site, so treat the figures below as indicative. They show a typical installed price before VAT and before any grant, alongside the SEAI Non-Domestic Microgen Grant your business could claim at that size.
| System Size | Indicative Cost Before VAT and Grant | SEAI Grant | Typical Use |
| 10 kWp | €13,000 to €18,000 | €3,600 | Small shop or office |
| 20 kWp | €23,000 to €33,000 | €6,600 | Medium office or workshop |
| 30 kWp | €30,000 to €45,000 | €8,600 | Larger office or school |
| 50 kWp | €50,000 to €80,000 | €12,600 | Factory or warehouse |
| 100 kWp | €90,000 to €150,000 plus | €22,600 | Large industrial or farm site |
Grant amounts follow the current SEAI rate bands and are worked out on the price before VAT. One application is allowed per property, so it pays to size the system for your full demand first time. For a closer look at a larger project, see our guide to 100kW solar system cost in Ireland.
What Drives the Price of a Commercial Solar System
Two systems of the same size can be quoted at very different prices. Beyond capacity, these are the things that move a commercial quote up or down.
- Roof or ground mount. Pitched roofs with good access are the cheapest to work with. Flat roofs need ballasted or raised frames, and ground mounted arrays need groundworks and framing, both of which add cost.
- Roof condition and access. Older roofs, fragile sheeting, height and restricted access all add labour and safety cost. Any roof that needs strengthening or repair first will raise the total.
- Grid connection and phase. Larger systems often need a connection agreement with ESB Networks, and three phase sites or export limiting equipment add to the electrical work.
- Component quality. Higher tier panels, inverters and mounting last longer and perform better, but cost more upfront. Which panels suit a commercial roof is a decision in itself, and we cover it in our guide to the best solar panels for commercial sites in Ireland.
- Battery storage. Storage is an add on, not a requirement. Most businesses that use most of their power during the day get a strong return from panels alone, and can add storage later.
Your Real Cost After Grants and Tax Relief
Sticker price and real cost are two different things for a business. Three separate supports bring the number down, and they can be used together.
SEAI Non-Domestic Microgen Grant
Businesses, farms, schools and community groups can claim the Non-Domestic Microgen Grant towards solar PV. Funding is €1,800 for systems up to 6 kWp, then €300 per kWp from 7 to 20 kWp, €200 per kWp from 21 to 200 kWp, and €150 per kWp above that, up to a maximum of €162,600 for a one megawatt system. It is calculated on the installed cost before VAT. Full detail is in our guide to solar grants in Ireland.
VAT for Business
Homes get 0% VAT on solar, but commercial premises do not. VAT applies to a business installation. If your business is VAT registered, you can normally reclaim it through your VAT return, so for most companies it is not a real added cost. Either way, the SEAI grant is worked out on the price before VAT.
Year One Tax Write Off
Trading companies and sole traders can claim the Accelerated Capital Allowance on qualifying solar equipment. Instead of writing the cost down over eight years, youcan deduct the full cost against taxable profits in the year of purchase, as long as the equipment is on the SEAI Triple E register. For a profitable business this returns a large share of the spend through a lower tax bill. Our guide to the Accelerated Capital Allowance for solar explains how it works.
Farms and TAMS 3
Farmers have a separate option. Instead of the Microgen grant, eligible farms can use the TAMS 3 Solar Capital Investment Scheme, which pays 60% of costs up to a €90,000 investment ceiling, giving a maximum grant of €54,000 on systems up to 62 kWp. Farms use one scheme or the other for a given system, not both.
Put together, a grant on the gross price and a tax deduction on what is left can change the sums for a business a great deal. We confirm the exact position for your site and your tax situation before you commit.
Payback and Return on Commercial Solar
Most commercial systems pay for themselves within about four to seven years, and sometimes faster once the grant and the year one tax write off are counted. After that the electricity is close to free for the life of the system.
Payback depends on more than price. What matters most is how much of the power you use on site during daylight, because every unit you use is a unit you do not buy from the grid at 25 to 35 cent. Businesses that run through the day, such as factories, shops, offices and farms, tend to see the fastest return. Surplus power can be sold back to the grid, though for most businesses the real value is in cutting daytime demand rather than export. If the upfront figure is the barrier, the cost can be spread, and we cover the options in our guide to funding a commercial solar project
Panels typically carry performance warranties of 25 years or more and keep generating well beyond that, so the return runs for decades. This depends on the property and your usage, and we confirm the numbers after a survey.