What is the biggest downside of commercial solar?

The main limitation is that solar only generates during daylight, so on its own it won't cover night-time or winter-evening demand. Battery storage can bridge this — storing surplus daytime generation to raise self-consumption from around 30–40% to 60–70%. That said, while commercial batteries are clearly the future, they remain expensive today and don't always stack up financially, so we'll only recommend storage where the numbers genuinely work for your site.

Commercial Solar Panels - Spirit Energy

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What is the payback period for commercial solar?

Most Spirit commercial systems pay back in 3–5 years. For energy-intensive businesses with high daytime electricity use, payback can be under 3 years. Our Philip Dennis Foodservice installation — 695kWp across their distribution centre — paid back in under four years and is projected to save £2.4M over 25 years, delivering a 23% IRR.

For a full breakdown of commercial solar cost, payback and ROI by system size, see our complete guide.

*Figures below based on ~60% utilisation on site.

System size	Number of panels	Typical business	Installed cost	Annual saving	Payback	IRR
20–50 kWp	45-115 panels	Small office / retail	£18,000–£45,000	£5,000–£13,000	4–6 yrs	15-20%
50–100 kWp	115-225 panels	Medium warehouse / school	£40,000–£85,000	£12,000–£25,000	3–5 yrs	18-25%
100–250 kWp	225-570 panels	Large industrial / logistics	£75,000–£190,000	£25,000–£65,000	3–4 yrs	20-28%
250–500 kWp	570-1135 panels	Distribution centre / campus	£175,000–£350,000	£60,000–£130,000	2.5–4 yrs	23-32%
500 kWp+	1135+ panels	Large manufacturing / NHS	£350,000+	£120,000+	2.5–4 yrs	25-35%

# of panels	Annual saving	Payback
45-115	~£9000	4–6 yrs
115-225	~£18,000	3–5 yrs
225-570	~£45,000	3–4 yrs
570-1,135	~£95,000	2.5–4 yrs
1,135+	~£120,000+	2.5–4 yrs

What does a commercial solar installation involve?

Free site assessment. Aerial imagery, 3D roof modelling and energy analysis.

Your proposal. Bespoke design, forecast and financial model with payback and IRR.

DNO application.6–10 wks We handle the G99 application end-to-end.

Planning. Most systems are Permitted Development; we advise if not.

Installation.1–3 wks In-house MCS-certified team, start to finish.

Commissioning. Tested, monitoring set up, MCS certificate issued.

Ongoing O&M. Aftercare and monitoring for the system's life.

Read about each stage in detail in our 7-step installation process for UK businesses blog.

What are the best solar panels for commercial use?

We only install Tier 1 monocrystalline solar panels from manufacturers we trust. Our 2026 commercial solar lineup includes AIKO, LONGi, and REC for premium, high-efficiency and space-constrained installations, alongside Trina Solar, JA Solar, and DMEGC for high-volume and cost-driven projects — each panel selected for a specific project type based on efficiency, temperature coefficient, voltage, and real-world performance in UK conditions. For large commercial rooftops we often recommend large solar panels, where the greater physical size means fewer panels, faster installation, and a lower cost per kWp. Every commercial solar installation is handled end-to-end by our in-house team — from site survey and design through to commissioning and aftercare.

Want the full technical detail? Our solar panel knowledge bank breaks down every panel we install — specs, comparisons, and more.

Panel	Technology	Power	Efficiency	Best for	Notes
AIKO Neostar	ABC back contact	up to 475W	up to ~24.8%	Shaded roofs, space-constrained, in-roof, premium installs	Highest efficiency; excels where space is tight or shading is an issue
LONGi Hi-MO X10	HPBC 2.0 back contact	up to 670W	up to ~24.8%	Pitched, flat, and large rooftops, shaded sites	Highest efficiency; SSI member; strong shading performance; large-format dual-glass option for big arrays
Trina Vertex S+ / Vertex	n-type i-TOPCon	up to 495W	up to ~23.3%	All project types — the workhorse	SSI member; dual-glass, top-3 manufacturer, excellent value. Top-tier outputs can have limited availability
JA Solar DeepBlue 4.0 Pro	n-type TOPCon	470W	~22.5%	Volume commercial where assured supply matters	SSI member; reliable supply, solid all-rounder
DMEGC Infinity	n-type TOPCon	up to 590W	up to 23.2%	Cost-driven projects, spec compliance	The value option — meets Tier 1 / dual-glass spec boxes at low cost
REC Alpha Pure-RX	HJT (heterojunction)	up to 470W	up to 22.6%	Small roofs, in-roof, discerning supply chains	Excellent ethics and supply-chain credentials, lead-free, robust build

What happens next?

We get in touch

A commercial solar expert contacts you to understand your site and energy use — no hard sell.

Free site assessment

We assess your roof, load profile and grid connection, then design a system sized to your demand.

Clear proposal & costs

You get system sizing, installed cost, projected savings and payback — all in one place.

We handle everything

From DNO application to install and full O&M support — one accountable team, start to finish.

Prefer to talk? Call 0118 951 4490 or email commercial@spiritenergy.co.uk

Yes — for most businesses with daytime electricity use and suitable roof space. With grid electricity at 22–35p/kWh and solar generating at just 4–6p/kWh over its lifetime, any business spending £20,000 or more a year on electricity sees a strong return. Most Spirit commercial systems pay back in 4–5 years and deliver a 20–35% IRR over their 25-year-plus lifetime.

Commercial solar costs roughly £700–£1,100 per kWp installed in 2026. Larger systems cost less per kWp because fixed costs — survey, scaffolding, grid connection — are spread across more panels. As a guide, a 50kWp system runs around £40,000–£85,000, while a 100kWp system benefits from greater economies of scale. Every quote is sized to your site and energy use.

Usually not. Most commercial rooftop solar qualifies as Permitted Development in the UK. Listed buildings, properties in conservation areas, and some ground-mounted arrays may require an application. Spirit assesses your site and handles any planning permission needed as part of the process, so you don't have to navigate it alone.

Commercial solar panels typically last 25–30 years or more. Quality panels carry a performance warranty of 25 years or longer and degrade only around 0.4–0.5% per year, so a system still produces roughly 85–90% of its original output after 25 years. The inverter is usually the only component you'd expect to replace once, around the 10–15 year mark.

Scale and design. A home system is typically 4–6 kWp; commercial systems start around 50 kWp and can exceed 1,000 kWp. Commercial projects involve three-phase connections, DNO grid approval, structural surveys and careful load-profile matching to daytime business demand — which is why a well-designed commercial system often delivers faster payback than a domestic one.

The main limitation is that solar only generates during daylight, so on its own it won't cover night-time or winter-evening demand. Battery storage can bridge this — storing surplus daytime generation to raise self-consumption significantly. That said, while commercial batteries are clearly the future, they remain expensive today and don't always stack up financially, so we'll only recommend storage where the numbers genuinely work for your site.

Often, yes. UK businesses may qualify for a 50% First Year Allowance on solar PV, plus Annual Investment Allowance where it applies — meaningful first-year corporation tax relief on the system. Tax treatment depends on your circumstances, so always verify with your accountant.

A commercial solar installation runs through seven stages: free site assessment, a tailored proposal, the DNO grid application, planning (where needed), installation, commissioning, and ongoing maintenance. Spirit's in-house MCS-certified team handles every stage end-to-end — most installs take just 1–3 weeks on site once approvals are in place.

Although care is taken to ensure that the information on our website (www.spiritenergy.co.uk) and any guides, calculators or checklists provided by us, electronically or otherwise, are accurate and up-to-date, we cannot accept any responsibility for mistakes or omissions. We enter into no express or implied conditions, warranties, terms or representations regarding the quality, accuracy or completeness of the information. We exclude to the extent lawfully permitted all liability for loss or damage, whether direct, indirect or consequential arising out of your use of our website or any guides, calculators or checklists provided by us, or from any information or omission contained in our website or any guides, calculators or checklists provided by us.

Commercial Solar Panels for UK Businesses

Is commercial solar worth it for UK businesses in 2026?

How much does commercial solar cost in the UK?

What is the payback period for commercial solar?

How do businesses finance commercial solar?

Commercial solar across every sector

Case studies

Hansgrohe UK Headquarters - 126.14 kWp

Spirit House, Reading - 54.61 kWp

Philip Dennis Foodservice - 695 kWp

Old Thorns Hotel & Golf Course - 217 kWp

St. Matthew's Care Home - 98.74 kWp

Wolverton Leisure Centre - 377.97 kWp

What does a commercial solar installation involve?

What are the best solar panels for commercial use?

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FAQ

Are commercial solar panels worth it for UK businesses?

How much do commercial solar panels cost in the UK?

Do you need planning permission for commercial solar panels?

How long do commercial solar panels last?

What is the difference between residential and commercial solar?

What is the biggest downside of commercial solar?

Can a business claim solar panels against tax?

How does commercial solar installation work?

Still have questions? See our full FAQ page.