Solar Panels for Hotels, Guesthouses & B&Bs in Ireland
Hotels and guesthouses run heavy year-round loads, hot water, laundry, kitchens and heating, which makes them one of the best-suited building types for commercial solar in Ireland. Most hospitality properties install between 20 and 150 kWp, qualify for the SEAI Non-Domestic Microgeneration Grant (NDMG) of up to €162,600, and pay the system back in 5–7 years. Compare commercial solar quotes from Irish installers who work with hotels.
Last updated June 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Quick Answer
Hotels, guesthouses and B&Bs in Ireland typically install solar PV systems of 20-150 kWp, depending on bed count and on-site demand. With high daytime and year-round loads from hot water, laundry and kitchens, self-consumption is usually 80-90%. The SEAI NDMG grant covers up to €162,600, and a typical hospitality system pays back in 5-7 years with a 10-15% annual ROI.
Why solar suits hotels and guesthouses
Hospitality is an almost ideal fit for solar PV. A hotel or guesthouse uses electricity all day and all year, guest rooms, lifts, kitchens, bars, leisure facilities and reception never fully switch off, and demand peaks during daylight hours when solar generates most. That alignment means hotels typically self-consume 80–90% of what their panels produce, which is where the real value sits: every unit used on-site avoids buying grid electricity at roughly €0.22/kWh, far more than the ~€0.18/kWh you would earn exporting it.
The biggest single load in most hotels is hot water, en suite showers, baths, kitchens and especially on-site laundry. Solar PV pairs well here through a hot-water diversion unit (for example an immersion diverter), which sends surplus generation into the hot-water cylinder instead of exporting it cheaply. Where hot-water demand is very high, a hotel can combine solar PV with solar thermal panels dedicated to water heating, so each technology covers what it does best.
Year-round occupancy
Unlike seasonal businesses, most hotels run a steady base load every month, so generation is used rather than exported.
Hot water & laundry
Showers, kitchens and laundry create large daytime demand. A hot-water diverter turns surplus solar into stored hot water.
Guest sustainability appeal
Visible solar and lower carbon support green tourism certifications and corporate or eco-conscious bookings.
What size solar system does a hotel need?
Hospitality systems usually fall between 20 and 150 kWp, scaling with bed count, leisure facilities and whether laundry is done on-site. A small guesthouse or B&B might suit 10–25 kWp, a mid-size hotel 40–80 kWp, and a large hotel with a pool, spa and full laundry can use 100–150 kWp or more. The right size is set by your daytime base load, not just roof area, an installer will review 12 months of half-hourly consumption data before sizing.
| Property Type | Typical System | Panels | Roof Area | Annual Generation |
|---|---|---|---|---|
| B&B / small guesthouse | 10–25 kWp | 25–60 | 50–125 m² | ~8,600–21,500 kWh |
| Boutique / mid-size hotel | 40–80 kWp | 100–200 | 200–400 m² | ~34,000–69,000 kWh |
| Hotel with leisure / spa | 80–120 kWp | 200–300 | 400–600 m² | ~69,000–103,000 kWh |
| Large hotel + on-site laundry | 120–150 kWp | 300–375 | 600–750 m² | ~103,000–129,000 kWh |
Rule of thumb: 1 kWp needs roughly 4–5 m² of roof and produces about 860 kWh/year in Ireland. Figures are estimates for 2026, an SEAI-registered installer will confirm sizing from your actual metered demand.
Grants, tax relief and payback for hotels
Hotels, guesthouses and B&Bs apply for the SEAI Non-Domestic Microgeneration Grant (NDMG), not the €1,800 domestic grant. The NDMG pays up to a maximum of €162,600 on larger systems, with a higher rate per kWp on smaller installs. At commercial scale, solar costs roughly €800–€900 per kWp installed before the grant.
Hotels operated through a trading company can also claim the Accelerated Capital Allowance (ACA), writing off 100% of qualifying solar and battery cost against profits in year one (the equipment must be on the Triple-E register). Combined with high self-consumption, that typically gives a payback of 5–7 years and a 10–15% annual ROI.
| System Size | Gross Cost (est.) | NDMG Grant (approx.) | Annual Generation | Indicative Payback |
|---|---|---|---|---|
| 20 kWp | €16,000–€18,000 | ~€6,000 | ~17,000 kWh | 5–7 years |
| 50 kWp | €40,000–€45,000 | ~€12,000 | ~43,000 kWh | 5–7 years |
| 100 kWp | €80,000–€90,000 | ~€22,000 | ~86,000 kWh | 5–7 years |
| 150 kWp | €120,000–€135,000 | ~€32,000 | ~129,000 kWh | 5–7 years |
Self-consumption is the main value driver. A hotel using most of its solar on-site offsets electricity at ~€0.22/kWh, while surplus exported under the Clean Export Guarantee earns around ~€0.18/kWh. Because hospitality demand runs through daylight hours, well-sized hotel systems reach 80–90% self-consumption, which is why payback lands at the better end of the commercial range.
Grant timing
Apply for the NDMG and receive your Letter of Offer before any work begins, or the grant is lost. Premises generally must have been built and occupied on or before 31 December 2020, and the NDMG must not have been claimed previously at the property.
Roof, planning and install considerations for hotels
Hotel roofs vary widely, flat membrane roofs over function rooms and extensions, pitched slate on older buildings, and mixed roofscapes across phased developments. Flat roofs suit ballasted, non-penetrating mounting at 10–15°, while pitched roofs take standard rail systems. A structural check matters on older hospitality buildings before adding panel and ballast weight.
Rooftop solar is largely planning-exempt under S.I. 493/2022 within the relevant area caps, but the caps and conditions for commercial buildings differ from domestic limits, and larger arrays or any ground-mount may need permission. Hotels that are protected structures, or sit in an architectural conservation area, will usually require planning consent, see our notes on commercial solar planning. Your installer should confirm exemption or handle the application.
On the grid side, hotels connect through ESB Networks under the NC6 process for smaller systems or NC7 for larger ones (up to 200kW), and inverters must meet EN 50549. Practical hospitality points worth raising with your installer:
- Fit a hot-water diverter so surplus solar heats cylinders for showers, kitchens and laundry instead of exporting cheaply.
- Schedule the install outside peak season, roof access and crane work disrupt guest areas and parking.
- Where hot-water demand is large, consider pairing PV with solar thermal so each system covers its strongest use.
- Plan cabling routes around occupied rooms and leisure areas to limit noise and disruption during works.
Thinking about solar for your hotel or guesthouse?
Get free, no-obligation quotes from Irish installers experienced with hospitality sites.
Get Commercial Solar QuotesHotel & Guesthouse Solar FAQ
How many solar panels does a hotel need in Ireland?
Most Irish hotels and guesthouses install 20-150 kWp, which is roughly 50 to 375 panels. A small B&B might suit 10-25 kWp, a mid-size hotel 40-80 kWp, and a large hotel with a pool and on-site laundry 100-150 kWp. The right size is set by your daytime electricity demand, confirmed from 12 months of metered consumption.
What grant can a hotel get for solar panels?
Hotels, guesthouses and B&Bs apply for the SEAI Non-Domestic Microgeneration Grant (NDMG), which pays up to a maximum of €162,600 on larger systems. This is the commercial grant, not the €1,800 domestic grant. Trading companies can also claim the Accelerated Capital Allowance to write off 100% of qualifying cost against profits in year one.
What is the payback period for hotel solar in Ireland?
A typical hospitality system pays back in 5-7 years with a 10-15% annual ROI. Hotels reach the better end of that range because year-round daytime demand from hot water, laundry and kitchens means they self-consume 80-90% of generation, offsetting grid electricity at about €0.22/kWh.
Can solar panels power a hotel's hot water and laundry?
Solar PV with a hot-water diverter sends surplus electricity into the hot-water cylinder, covering a share of shower, kitchen and laundry demand instead of exporting it cheaply. Where hot-water use is very high, hotels often combine solar PV with solar thermal panels dedicated to water heating so each technology covers what it does best.
Do hotel solar panels need planning permission?
Rooftop solar on commercial buildings is largely planning-exempt under S.I. 493/2022 within the relevant area caps, though commercial caps differ from domestic limits. Larger arrays, any ground-mount, protected structures and properties in conservation areas typically need permission. Your installer should confirm exemption or handle the application.
Related Guides
Commercial Solar
Solar panels for Irish businesses: costs, NDMG grants, and ROI.
Solar Thermal
Solar hot water systems: costs, grants, and solar thermal vs PV.
Solar for Restaurants & Pubs
Hospitality solar PV: kitchen load, sizing, grants, payback.
Solar for Shops & Retail
Retail solar PV: refrigeration load, sizing, grants, payback.
Sources
- SEAI, Non-Domestic Microgen Scheme (NDMG)
- SEAI, Accelerated Capital Allowance (ACA)
- ESB Networks, Micro and Small-Scale Generation
Last updated: June 2026
John Rooney is the founder of Solar Info and has been covering the Irish solar energy market since 2023. He fact-checks all content against official SEAI data and maintains relationships with SEAI-registered installers across Ireland.
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