Commercial Solar Panel Installation Ireland: The Complete 2026 Business Guide

Commercial solar panels are one of the highest-return investments an Irish business can make in 2026. A typical 50kW system costs €45,000–€55,000 before incentives, generates €12,000–€18,000 in annual electricity savings, and pays for itself in 3–5 years — with the 100% Accelerated Capital Allowance meaning the full cost is tax-deductible in year one. See our SEAI grants and tax incentives for more details.

Ireland’s commercial electricity rates have increased by over 40% since 2021, and while wholesale prices have stabilised somewhat in 2026, businesses are still paying between 25c and 35c per kWh depending on their tariff and usage profile. Solar offers a way to lock in a portion of your energy costs at a fixed, predictable rate for 25+ years — effectively hedging against future price increases while simultaneously reducing your carbon footprint and improving your BER rating.

This guide covers everything Irish business owners, facility managers, and financial controllers need to know about commercial solar panel installation in 2026 — from costs and grants to ROI calculations, planning rules, grid connection, and financing options. Whether you operate a warehouse in Dublin, a hotel in Kerry, or a manufacturing facility in Cork, the numbers make a compelling case. See our planning permission guide for more details. See our selling electricity to the grid for more details.

Commercial Solar Panels in Ireland: What Businesses Need to Know

Commercial solar PV systems in Ireland typically range from 10kW for small offices to 100kW+ for large warehouses, factories, and retail units. The technology is the same proven photovoltaic panels used in residential installations, but commercial systems are larger, mounted on flat or pitched commercial roofs, and designed to maximise self-consumption during business operating hours.

Here are the key facts every Irish business should know heading into 2026:

• System sizes: Most commercial installations in Ireland fall between 20kW and 100kW, though larger systems of 200kW+ are increasingly common for energy-intensive businesses.
• Annual generation: A well-designed 50kW system in Ireland generates approximately 42,000–48,000 kWh per year, depending on orientation, tilt, and shading.
• Self-consumption rates: Commercial premises typically achieve 70–90% self-consumption because their peak demand coincides with peak solar generation (daytime, weekdays).
• Panel lifespan: Modern commercial solar panels carry 25–30 year performance warranties, with most manufacturers guaranteeing at least 80% output at year 25.
• Carbon reduction: A 50kW system offsets approximately 15–18 tonnes of CO2 annually, a significant contribution to corporate sustainability targets and ESG reporting.
• Zero VAT: Solar panel supply and installation for business premises is zero-rated for VAT in Ireland as of 2024, reducing the effective cost significantly.
• Grid export: Businesses can sell surplus electricity back to the grid through the Clean Export Guarantee (CEG) scheme, though the economics strongly favour maximising self-consumption.

The commercial solar market in Ireland has matured rapidly. The Sustainable Energy Authority of Ireland (SEAI) reports that non-domestic solar installations have grown by over 300% since 2022, driven by high energy costs, attractive tax incentives, and increasing corporate sustainability commitments.

How Much Do Commercial Solar Panels Cost in Ireland?

Commercial solar panel costs in Ireland have decreased significantly over the past five years, while electricity prices have risen substantially. This convergence means the financial case for commercial solar has never been stronger. The cost per watt decreases as system size increases, making larger commercial installations particularly cost-effective.

Here is what Irish businesses can expect to pay for commercial solar installations in 2026:

System Size	Approx. Panels	Roof Space Needed	Cost Before Grants	SEAI Non-Domestic Grant	Net Cost After Grant	Annual Savings (est.)	Payback Period
10 kW	22–25	50–60 m²	€12,000–€15,000	€2,700	€9,300–€12,300	€2,800–€3,800	3–4 years
20 kW	44–50	100–120 m²	€22,000–€28,000	€5,400	€16,600–€22,600	€5,500–€7,200	3–4 years
30 kW	66–75	150–180 m²	€30,000–€38,000	€8,100	€21,900–€29,900	€8,000–€10,500	3–4 years
50 kW	110–125	250–300 m²	€45,000–€55,000	€13,500	€31,500–€41,500	€12,000–€18,000	3–5 years
100 kW	220–250	500–600 m²	€80,000–€100,000	€20,400*	€59,600–€79,600	€24,000–€35,000	3–4 years

*SEAI Non-Domestic grant is capped. Figures are indicative and based on 2026 market rates. Actual costs depend on roof type, access, electrical infrastructure, and location. All figures exclude VAT (which is zero-rated for solar installations).

Several factors influence the final cost of a commercial solar installation:

• Roof type and condition: Flat roofs require ballasted mounting systems (slightly more expensive), while pitched roofs use rail-mounted systems. Roof reinforcement may be needed for older buildings.
• Electrical infrastructure: Upgrading the distribution board, adding a new meter, or running cable from the roof to the electrical intake can add €2,000–€5,000.
• Scaffolding and access: Multi-storey buildings or sites with restricted access increase installation costs.
• Panel and inverter choice: Premium Tier 1 panels (such as SunPower, REC, or Longi) and commercial-grade string inverters (SMA, Huawei, SolarEdge) cost more but deliver higher lifetime yields.
• Battery storage: Adding commercial battery storage (typically 30–100 kWh) can add €15,000–€50,000 but is becoming increasingly viable for businesses with evening or weekend demand.

The key point for business decision-makers: when you factor in the SEAI grant and the Accelerated Capital Allowance (which we cover in the next section), the effective cost of commercial solar in Ireland is significantly lower than the headline figures suggest. See our solar inverter options for more details.

Commercial Solar Panel Grants and Tax Incentives

Ireland offers some of the most attractive financial incentives for commercial solar installation in Europe. Between direct grants, tax reliefs, and sector-specific supports, Irish businesses can reduce the effective cost of their solar investment by 40–60%. Here are the three main supports available in 2026:

1. SEAI Non-Domestic Microgeneration Grant

The Sustainable Energy Authority of Ireland (SEAI) provides grants for non-domestic solar PV installations. As of 2026, the grant covers:

• €2,700 for the first 6 kWp installed
• €300 per additional kWp up to 50 kWp
• Maximum grant of approximately €20,400 for a 50kWp+ system
• Available to all businesses, community organisations, and public sector bodies
• The property must have been built and occupied before the application

The application process is straightforward: your installer applies on your behalf through the SEAI portal. The grant is paid after installation is complete and verified. Processing times have improved significantly, with most grants approved within 4–6 weeks of submission.

2. Accelerated Capital Allowance (ACA) — 100% Tax Write-Off in Year One

This is the single most powerful financial incentive for commercial solar in Ireland, yet many businesses are unaware of it. Under the Accelerated Capital Allowance scheme (Section 285A of the Taxes Consolidation Act 1997), businesses can write off 100% of the cost of qualifying solar PV equipment against their taxable profits in the first year.

Here is what this means in practice:

• A business paying the 12.5% corporation tax rate that installs a €50,000 solar system can reduce its tax bill by €6,250 in year one.
• A sole trader or partnership paying the 40% marginal income tax rate can save €20,000 in tax on the same €50,000 system.
• Without the ACA, the same capital expenditure would be written off over 8 years at the standard 12.5% per year — so the ACA massively accelerates the cash flow benefit.
• The ACA applies to the full cost of the solar PV system, including panels, inverters, mounting, and installation labour.

To qualify, the solar equipment must be listed on the SEAI’s Triple E Register (most commercial solar products are). Your accountant or tax adviser can handle the claim as part of your annual tax return — it requires no separate application.

3. TAMS III for Agricultural Businesses

Farmers and agricultural businesses have an additional support through the Targeted Agricultural Modernisation Scheme (TAMS III), administered by the Department of Agriculture. Under TAMS III:

• Grant rates of 40% (60% for qualifying young trained farmers) on solar PV installations up to 162 kWp
• Maximum investment ceiling of €90,000 for the solar PV measure
• Can be combined with the ACA for additional tax savings
• Covers solar panels, inverters, battery storage, and associated electrical works

For a farmer installing a 30kW system costing €35,000, TAMS III at 40% provides a €14,000 grant, reducing the cost to €21,000 — before the ACA tax benefit. This combination makes solar one of the most financially attractive investments available to Irish farmers.

The Business Case: ROI and Payback Period

Let us work through a detailed ROI calculation for a typical Irish business considering solar. This example is based on real-world numbers from commercial installations completed in Ireland during 2025–2026.

Example: Medium-Sized Business — 50kW System

Business profile: A manufacturing company in the Midlands with annual electricity consumption of 120,000 kWh, currently paying 28c/kWh on a commercial tariff (blended rate including standing charges and PSO levy).

• System size: 50 kWp (110 panels)
• Annual generation: 45,000 kWh
• Self-consumption rate: 85% (38,250 kWh used on-site)
• Grid export: 15% (6,750 kWh sold at 15c/kWh)
• Gross cost: €50,000
• SEAI grant: €13,500
• Net cost: €36,500
• ACA tax saving (at 12.5% CT rate): €6,250 in year one
• Effective cost after grant + ACA: €30,250

Annual financial benefit:

• Self-consumed electricity savings: 38,250 kWh × €0.28 = €10,710
• Export income: 6,750 kWh × €0.15 = €1,013
• Total year-one benefit: €11,723

Simple payback: €30,250 ÷ €11,723 = 2.6 years

This is a genuinely exceptional return for a low-risk infrastructure investment. Even using the most conservative assumptions (lower self-consumption, lower electricity rates), commercial solar in Ireland typically pays for itself in under 5 years.

10-Year Savings Projection

This projection assumes 3% annual electricity price inflation, 0.5% annual panel degradation, and no battery storage:

Year	Electricity Rate (c/kWh)	Self-Consumption Savings	Export Income	Cumulative Savings	Net Position (After Investment)
1	28.0	€10,710	€1,013	€11,723	-€18,527
2	28.8	€10,981	€1,013	€23,717	-€6,533
3	29.7	€11,259	€1,013	€35,989	€5,739
4	30.6	€11,543	€1,013	€48,545	€18,295
5	31.5	€11,834	€1,013	€61,392	€31,142
6	32.4	€12,132	€1,013	€74,537	€44,287
7	33.4	€12,437	€1,013	€87,987	€57,737
8	34.4	€12,750	€1,013	€101,750	€71,500
9	35.4	€13,070	€1,013	€115,833	€85,583
10	36.5	€13,398	€1,013	€130,244	€99,994

Over 10 years, this 50kW commercial solar system generates approximately €130,000 in total savings on an effective investment of €30,250 — a return of over 330%. Over the 25-year warranty life of the panels, total savings exceed €400,000. These figures explain why commercial solar is one of the fastest-growing capital investments among Irish businesses.

What Types of Business Benefit Most?

Almost every business in Ireland with a suitable roof can benefit from solar, but some business types see particularly strong returns due to their energy consumption patterns, roof characteristics, and operating hours. Here is a breakdown of the most common commercial solar installations:

Warehouses and Distribution Centres

Warehouses are arguably the ideal commercial solar candidate. They have expansive, unshaded flat roofs, consistent daytime energy demand (lighting, refrigeration, material handling), and high self-consumption rates. A typical 5,000 m² warehouse roof can accommodate a 200–300 kW system, generating annual savings of €50,000–€80,000. Many logistics companies in Dublin, Limerick, and Cork have already installed solar, and the sector is expected to see accelerated adoption through 2026.

Manufacturing and Industrial Facilities

Factories with heavy daytime electricity demand — compressors, machinery, process heating — achieve excellent self-consumption rates of 85–95%. A typical 100kW system on a factory roof generates €24,000–€35,000 in annual savings. The ACA is especially valuable for manufacturing companies with high corporation tax bills, as it provides an immediate €12,500 tax deduction at the 12.5% rate (or significantly more for companies paying the higher effective rates).

Retail and Shopping Centres

Retail premises benefit from strong alignment between solar generation and trading hours. A mid-sized supermarket with a 50kW system can offset €12,000–€16,000 of its annual electricity bill. Refrigeration loads, lighting, and HVAC systems create a consistent baseload that solar serves perfectly. Large shopping centres with 100kW+ systems see proportionally greater savings.

Office Buildings

While offices typically have smaller roofs relative to their floor area, a 20–30kW system can reduce electricity costs by €5,500–€10,500 per year. Office buildings with air conditioning see peak demand on sunny days — precisely when solar panels generate the most electricity. For owner-occupiers, the ACA makes the investment particularly attractive.

Hotels and Hospitality

Hotels have high and consistent energy demand — heating, hot water, laundry, kitchens, lighting — and typically operate 7 days a week. A 40–60kW system on a hotel roof can save €10,000–€18,000 annually. Larger hotels with 100kW+ systems achieve even greater savings. Hotels also benefit from the strong sustainability messaging that solar provides — an increasing factor in booking decisions, particularly among corporate clients and environmentally conscious travellers.

Agricultural Businesses and Farms

Dairy farms, poultry operations, and other energy-intensive agricultural businesses benefit from solar PV combined with the TAMS III grant. A typical 20–30kW system on a farm building costs €22,000–€35,000 before the TAMS III grant (which covers 40–60%), resulting in a net cost as low as €9,000–€14,000. Milking parlours, grain dryers, cold stores, and irrigation systems all create excellent daytime load profiles for solar. Annual savings typically range from €5,500–€10,500, with payback periods as short as 1.5–3 years when the TAMS III and ACA are combined.

Commercial Solar Installation Process: Step by Step

Installing solar on a commercial premises is a more involved process than a residential installation, but a competent installer will manage the entire project from initial assessment to final commissioning. Here is what to expect at each stage:

Step 1: Site Survey and Energy Assessment

An experienced commercial solar installer will conduct a detailed site survey, typically including:

• Roof structural assessment (load-bearing capacity, condition, material)
• Electrical infrastructure review (distribution board, meter, grid connection capacity)
• Shading analysis using specialist software (such as PVsol or HelioScope)
• Review of 12 months of electricity bills to understand demand profile
• Measurement and drone survey of the roof (for large or complex buildings)

This survey is the foundation of the entire project. It determines the optimal system size, panel layout, and expected financial returns. A thorough survey typically takes half a day for a standard commercial building. Request a free site survey to find out what solar could save your business.

Step 2: System Design and Proposal

Based on the survey data, the installer produces a detailed design and financial proposal, including:

• Panel layout showing exact positioning on the roof
• System specification (panel make/model, inverter type, mounting system)
• Expected annual generation and self-consumption modelling
• Financial projections showing payback period, 10-year savings, and ROI
• Grant and ACA calculations tailored to your business

Step 3: Planning Permission (if required)

Most commercial solar installations in Ireland are exempt from planning permission (covered in detail in the next section). Where planning is required, your installer should manage the application process, which typically takes 8–12 weeks.

Step 4: Grant Application

Your installer submits the SEAI Non-Domestic Microgeneration grant application on your behalf. Approval typically takes 4–6 weeks. Work should not commence until the grant is approved.

Step 5: Installation

The physical installation of a commercial solar system typically takes:

• 10–20kW: 2–3 days
• 30–50kW: 3–5 days
• 100kW+: 1–2 weeks

Most commercial installations can be completed with minimal disruption to business operations. Roof work happens outside, and the electrical connection is typically done in a few hours, often scheduled for after business hours or a weekend. Scaffolding or cherry picker access may be required depending on building height.

Step 6: Electrical Commissioning and Testing

Once installed, the system undergoes comprehensive electrical testing and commissioning, including insulation resistance testing, earth fault loop impedance testing, and performance verification. A Safe Electric completion certificate (RECI cert) is issued.

Step 7: Grid Connection and Meter Upgrade

For systems intending to export surplus electricity, a grid connection agreement with ESB Networks is required (covered in detail below). A new smart meter or bi-directional meter is installed to measure both import and export.

Step 8: Monitoring and Handover

The installer sets up a monitoring system (typically cloud-based, accessible via phone app or web portal) that tracks generation, consumption, and system health in real time. Full documentation is provided, including warranties, test certificates, and maintenance guidelines.

Planning Permission for Commercial Solar

Planning permission is one of the most common concerns for businesses considering solar, but in most cases, commercial solar installations in Ireland are fully exempt from planning requirements. The 2022 and 2023 amendments to planning regulations significantly expanded the exemptions for solar PV.

What Is Exempt (No Planning Required)

• Roof-mounted solar panels on commercial buildings: Exempt where panels are mounted on the roof of an existing industrial, business, or commercial building and do not extend more than 2 metres above the plane of the roof surface, do not protrude more than 1 metre above the ridgeline, and the total area of panels does not exceed 50 m² (or 300 m² on industrial buildings).
• Ground-mounted solar panels on business premises: Exempt where the total area does not exceed 75 m² and height does not exceed 2 metres above ground level.
• Agricultural buildings: Roof-mounted solar on agricultural buildings is generally exempt where panels do not extend more than 2 metres above the roof plane and do not protrude more than 1 metre above the ridgeline.

What Needs Planning Permission

• Installations on protected structures or within architectural conservation areas
• Systems exceeding the size thresholds above
• Solar farms or large ground-mounted arrays on commercial land
• Installations that alter the external appearance of a building in a material way beyond the exemption conditions

Practical Implications

For the vast majority of commercial solar installations in Ireland — particularly systems up to 100kW on warehouse or factory roofs — no planning permission is required. The 300 m² exemption for industrial buildings is generous: it accommodates systems of approximately 50–60kW, which covers most SME installations. Larger systems may require planning, but applications for commercial solar are generally approved without difficulty, as local authorities are supportive of renewable energy development.

Your installer should confirm the planning position as part of their initial survey. If you are uncertain, a declaration of exemption can be obtained from your local authority, which provides formal confirmation that planning permission is not required.

Grid Connection for Commercial Solar

Connecting a commercial solar system to the electricity grid in Ireland requires engagement with ESB Networks, which manages the distribution network. The process has been streamlined in recent years but still requires planning and lead time.

NC5 Application (formerly known as DS3)

Any solar PV system that will export electricity to the grid requires a grid connection agreement. The process differs depending on system size:

• Systems up to 17 kVA (approximately 17 kW single-phase): Simplified notification process through ESB Networks’ online NC5 portal. Processing time: 2–4 weeks.
• Systems from 17 kVA to 50 kVA (three-phase): Standard NC5 application. ESB Networks may require a network study. Processing time: 4–8 weeks.
• Systems above 50 kVA: Full NC5 application with technical assessment. May require network upgrades. Processing time: 8–16 weeks, potentially longer if network reinforcement is needed.

Maximum Export Capacity (MEC)

Your MEC determines how much electricity you can export to the grid. For most commercial installations, the MEC is set to match the system’s export capacity. However, in some areas with grid constraints, the MEC may be limited, which does not prevent you from installing solar but may limit your export potential. Since commercial solar economics are driven primarily by self-consumption rather than export, a limited MEC rarely undermines the business case.

ESB Networks Process

1. Submit NC5 application online via the ESB Networks portal
2. ESB Networks reviews the application and may request additional technical information
3. If a network study is required, ESB Networks conducts an assessment of the local grid capacity
4. Connection offer is issued detailing any required works and associated costs
5. Accept the offer and schedule the meter upgrade/installation
6. ESB Networks installs the smart meter and activates the grid connection

Your installer should handle the NC5 application as part of the project. The Commission for Regulation of Utilities (CRU) oversees the grid connection framework and has introduced measures to speed up the process for small-scale generators including commercial solar. Be aware that in some areas, particularly rural substations, grid capacity constraints can add time to the process.

Financing Commercial Solar: Options for Irish Businesses

Not every business wants to — or can — fund a solar installation from cash reserves. Fortunately, several financing options have emerged in Ireland that allow businesses to go solar with minimal or zero upfront cost. Here is how the main options compare:

Financing Option	Upfront Cost	Who Owns the System	Typical Term	ACA Eligible	Best For
Cash Purchase	Full cost	Your business	N/A	Yes	Businesses with capital and high tax bills
Green Business Loan	None	Your business	5–7 years	Yes	Businesses wanting to preserve cash flow
Power Purchase Agreement (PPA)	None	PPA provider	10–20 years	No	Businesses wanting zero risk and no capital outlay
Solar Lease	None	Leasing company	7–15 years	No (lease payments may be deductible)	Businesses wanting fixed monthly payments

Cash Purchase

Buying outright remains the most financially advantageous option. You retain full ownership, claim the SEAI grant, benefit from the full ACA tax deduction in year one, and keep 100% of the energy savings. For a business with available capital and a corporation tax liability, the combination of grant + ACA can reduce the effective cost by 40–50%, making the cash payback period as short as 2–3 years.

Green Business Loans

Several Irish banks and credit unions now offer dedicated green finance products for solar installations. AIB, Bank of Ireland, and PTSB all have green business loan products with preferential interest rates (typically 4–7% APR) and terms of 5–7 years. Because you own the system, you can still claim the ACA and SEAI grant. In many cases, the monthly loan repayment is less than the monthly electricity savings from day one — making solar cash-flow positive from the start.

Power Purchase Agreement (PPA)

Under a PPA model, a third-party company installs, owns, and maintains the solar system on your roof at no cost to your business. You agree to purchase the electricity generated at a fixed rate per kWh, typically 15–25% below your current grid rate. PPAs are available for larger installations (typically 50kW+) and are becoming increasingly popular with businesses that want guaranteed savings without capital expenditure or maintenance responsibility. The main trade-off: you do not benefit from the ACA or own the asset.

Solar Leasing

Similar to a PPA, solar leasing involves a third party funding the installation. You make fixed monthly lease payments and use all the electricity generated. Lease payments are typically structured to be lower than the energy savings, creating a net benefit from month one. At the end of the lease term, you may have the option to purchase the system at a reduced price.

For most Irish SMEs, the optimal approach is either a cash purchase (maximising ACA benefit) or a green business loan (preserving cash while still owning the asset and claiming ACA). Get a free commercial solar assessment for your business — we will help you determine the right system size and financing option.

Case Studies: Irish Businesses Going Solar

The following case studies are based on typical commercial installations completed by our partner network across Ireland. They illustrate the real-world financial outcomes that businesses are achieving.

Case Study 1: Dublin City Hotel — 60kW System

Business: A 120-room hotel in Dublin 2 with annual electricity consumption of 280,000 kWh and an electricity bill of approximately €78,000 per year.

Installation: A 60kW system comprising 132 panels installed on the flat roof in a ballasted east-west configuration to maximise all-day generation. The installation was completed in 5 working days with zero disruption to hotel operations.

Financial summary:

• System cost: €58,000
• SEAI grant: €15,900
• Net cost: €42,100
• ACA tax saving (12.5% rate): €7,250
• Effective cost: €34,850
• Annual generation: 52,000 kWh
• Self-consumption rate: 92% (hotel operates 24/7)
• Annual savings: €14,560 (electricity) + €780 (export) = €15,340
• Payback period: 2.3 years

The hotel general manager noted that the installation has also strengthened their application for the Green Hospitality Award and improved their sustainability credentials for corporate bookings, which account for 45% of revenue.

Case Study 2: Cork Warehouse and Distribution Centre — 100kW System

Business: A food distribution company operating a 4,500 m² chilled warehouse in Cork’s Little Island industrial estate. Annual electricity consumption of 350,000 kWh, primarily driven by refrigeration running 24/7.

Installation: A 100kW system using 220 high-efficiency panels across the expansive flat roof. A 50kWh battery storage unit was also installed to shift solar energy into evening refrigeration load.

Financial summary:

• System cost (incl. battery): €115,000
• SEAI grant: €20,400
• Net cost: €94,600
• ACA tax saving (12.5% rate): €14,375
• Effective cost: €80,225
• Annual generation: 92,000 kWh
• Self-consumption rate: 95% (with battery)
• Annual savings: €25,760 (electricity) + €690 (export) = €26,450
• Payback period: 3.0 years

The company’s finance director described the solar installation as “the single best capital investment decision we have made in 10 years of operating this facility.” The system covers approximately 26% of total annual electricity demand, and the battery ensures that solar energy generated at midday powers the refrigeration units well into the evening.

Case Study 3: Galway Retail Unit — 25kW System

Business: A large garden centre and hardware store in Galway with a 1,200 m² retail floor area. Annual electricity consumption of 65,000 kWh, with peak demand during trading hours (9am–6pm).

Installation: A 25kW system with 55 panels installed on a south-facing pitched roof section. Installation completed in just 2 days.

Financial summary:

• System cost: €26,000
• SEAI grant: €8,400
• Net cost: €17,600
• ACA tax saving (sole trader, 40% marginal rate): €10,400
• Effective cost: €7,200
• Annual generation: 23,500 kWh
• Self-consumption rate: 88%
• Annual savings: €5,796 (electricity) + €423 (export) = €6,219
• Payback period: 1.2 years

This case study highlights the transformative impact of the ACA for sole traders and partnerships paying income tax at the higher rate. The 40% marginal rate means the ACA deduction is worth €10,400 on a €26,000 system — compared to just €3,250 for a company paying corporation tax at 12.5%. The owner described the payback as “almost unbelievable” and has since recommended solar to several other business owners in the area.

Frequently Asked Questions

How long does a commercial solar installation take from start to finish?

The entire process from initial site survey to commissioned system typically takes 8–14 weeks. This includes 1–2 weeks for survey and design, 4–6 weeks for grant approval, and 2–5 days for the physical installation itself. Larger systems or those requiring planning permission may take longer. The SEAI grant application is usually the longest lead time in the process.

Do commercial solar panels work in Ireland’s climate?

Yes, absolutely. Ireland receives sufficient solar irradiance (950–1,100 kWh/m²/year) to make commercial solar highly viable. Solar panels actually perform slightly better in cooler temperatures, and Ireland’s long summer days (up to 17 hours of daylight) generate significant output. Germany, which has similar irradiance levels, is the largest solar market in Europe and has demonstrated for decades that solar works effectively at these latitudes.

What is the Accelerated Capital Allowance and how does it work?

The Accelerated Capital Allowance (ACA) allows businesses to write off 100% of the cost of qualifying solar PV equipment against taxable profits in the first year of purchase, rather than the standard 12.5% per year over 8 years. For a company paying 12.5% corporation tax, this means an immediate tax saving of 12.5% of the system cost. For sole traders at the 40% marginal rate, the saving is 40% of the system cost. The equipment must be listed on the SEAI Triple E Register to qualify.

Can I install solar panels on a flat roof?

Yes, flat roofs are ideal for commercial solar installations. Panels are mounted on ballasted frames angled at 10–15 degrees, which does not require roof penetration and can be configured in east-west orientation to maximise the number of panels and all-day generation. Flat roofs also make maintenance and cleaning straightforward.

What happens to excess solar energy my business doesn’t use?

Surplus electricity is exported to the grid and you receive payment through the Clean Export Guarantee (CEG) scheme. Electricity suppliers are legally required to offer a CEG rate to microgenerators. Current CEG rates range from 12c to 21c per kWh, depending on your supplier. However, since the electricity you generate is worth 25–35c/kWh in avoided import costs, the system should be sized to maximise self-consumption rather than export.

How much roof space do I need for commercial solar?

As a rough guide, each kW of solar PV capacity requires approximately 5–6 m² of roof space. So a 50kW system needs approximately 250–300 m², and a 100kW system needs approximately 500–600 m². Flat roofs with east-west panel orientation can accommodate more capacity per square metre than south-facing pitched roofs.

Will solar panels damage my commercial roof?

No. Modern commercial solar mounting systems are designed to protect the roof. On flat roofs, ballasted systems sit on the membrane without any penetrations. On pitched roofs, rail-mount systems are secured to the roof structure through the covering, with appropriate flashing and sealing. A competent installer will conduct a structural assessment before installation to ensure the roof can support the additional load (typically 12–15 kg per m²).

What maintenance do commercial solar panels require?

Commercial solar panels require very little maintenance. An annual visual inspection and cleaning (if needed) is typically sufficient. Inverters may need replacement after 10–15 years (cost: €2,000–€5,000 for a commercial inverter). Monitoring systems will alert you to any performance issues. Many installers offer maintenance contracts for commercial systems at €300–€600 per year.

Can I install solar if I lease my commercial premises?

Yes, but you will need your landlord’s written permission. The lease should be reviewed to confirm you can make alterations to the building. In many cases, landlords are supportive, as solar adds value to the property and improves its BER rating. Some landlords install solar themselves and pass the savings to tenants as a reduced service charge. PPA models are particularly suitable for leased premises, as the PPA provider owns the equipment and the arrangement can be structured to survive a change of tenant.

How does commercial solar affect my business’s BER rating?

Solar PV significantly improves a building’s Building Energy Rating (BER). For commercial buildings subject to the Display Energy Certificate (DEC) requirements, solar can move the rating up by 1–3 bands, depending on system size relative to building energy consumption. With the EU Energy Performance of Buildings Directive (EPBD) setting increasingly strict minimum energy performance standards, solar PV is one of the most cost-effective ways to future-proof your building.

What warranties do commercial solar panels come with?

Commercial solar panels typically carry two warranties: a product warranty (covering manufacturing defects) of 12–25 years, and a performance warranty (guaranteeing minimum power output) of 25–30 years. Most Tier 1 manufacturers guarantee at least 80% of rated output at year 25. Inverters carry warranties of 5–15 years, with extended warranty options available. Your installer should also provide a workmanship warranty covering the installation itself, typically 5–10 years.

Is battery storage worth adding to a commercial solar system?

For most commercial installations, battery storage is not essential for a strong financial return, as daytime self-consumption rates are already high. However, batteries are increasingly viable for businesses with significant evening or weekend demand (hotels, restaurants, data centres), for load-shifting to avoid peak tariff rates, or for backup power in the event of grid outages. Battery costs have fallen significantly and continue to decrease. A commercial battery storage assessment can be included in your initial site survey to determine whether it makes financial sense for your specific usage profile.

How do I get started with commercial solar for my business?

The first step is a professional site assessment to determine your roof suitability, optimal system size, and projected financial returns. Submit your details and we’ll connect you with a specialist commercial installer in your area. The assessment is free, takes approximately one hour on-site, and gives you everything you need to make an informed decision — including a detailed financial proposal showing your specific payback period, annual savings, grant entitlement, and ACA tax benefit.