Commercial Solar Panel Installation for UK Businesses

Nationwide commercial solar, battery storage and EV charging developed and delivered around your site criteria, energy profile and long-term operating costs.

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  • 250+
    Commercial
    Installations
  • Battery Storage
    & EV integration
  • Nationwide
    coverage

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Why More UK Businesses Are Exploring Commercial Solar

Rising energy costs, unused roof space and future power demand are pushing more businesses to explore commercial solar.

Sustainability pressure with little visibility

Without a visible on-site energy project, ESG commitments and net-zero plans can stay abstract for customers, investors and internal teams.

Sustainability and brand value

Solar can support ESG reporting, customer expectations and long-term net-zero plans, while showing visible progress on decarbonising day-to-day operations.

Unused roof space

Large areas of suitable roof space often sit idle while sites keep buying daytime power from the grid.

Roof space that works harder

Turn suitable roof space into an on-site generation asset sized around your demand, roof layout and operating hours.

Disconnected energy upgrades

Solar, battery and EV plans can drift into separate projects with more cost and DNO complexity.

One joined-up energy plan

Plan solar PV, battery storage and EV charging as one commercial strategy — one DNO G99 application instead of three.

Unclear approvals and delivery

Grid applications, planning sign-off and live-site logistics can feel harder to navigate when delivery is split across suppliers.

A clearer route to delivery

End-to-end support through grid applications, programme planning and live-site scheduling.

An uncertain commercial case

If the system is not designed around actual site demand, the savings can feel harder to forecast and the return harder to justify internally.

Stronger return on investment

Commercial systems are typically sized to match site usage, helping businesses offset a meaningful share of purchased power and improve long-term energy cost control.

Rising daytime grid prices

Daytime grid prices stay exposed to supplier tariffs and market volatility, so every imported unit keeps adding cost pressure.

More power generated on site

Commercial systems are sized around site demand to reduce daytime imports and make better use of the power generated on site.

Commercial Solar For your Sector

From warehouses to sports venues, Mercia designs commercial solar systems around how each site uses power, future expansion and sustainability goals.

Commercial warehouse rooftop solar installation by Mercia Electrical

Warehouses

Turn large flat or pitched roofs into long-term savings; ideal for sites with high daytime lighting, refrigeration or FLT loads.

Commercial manufacturing premises rooftop solar installation by Mercia Electrical

Manufacturing

Offset high daytime demand with a PV + storage system built around your production schedule.

Commercial retail rooftop solar installation by Mercia Electrical

Retail

Reduce overheads and support sustainability reporting, ESG commitments and net-zero plans across multi-site estates.

Commercial office rooftop solar installation by Mercia Electrical

Offices

Cut operating costs, improve building performance and pair with workplace EV charging.

Agricultural barn and farm rooftop solar installation by Mercia Electrical

Farming & Agricultural

Make productive use of barns, sheds and agricultural buildings; pairs well with heat pumps and EV infrastructure.

Sports and leisure venue rooftop solar installation by Mercia Electrical

Sports & Leisure

Support clubs and venues with practical, site-specific solar design for pools, floodlights and pavilions.

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More Than Solar Panels — A Complete Commercial Solar System

What's Included in Your Commercial Solar Installation

A commercial solar project is more than panels on a roof. Mercia handles site survey, system design, grid applications, installation and handover, with project delivery aligned to CDM 2015 and BS 7671 requirements.

Design & installation

Site survey and half-hourly energy review

System design around roof layout, load profile and connection constraints

Commercial mounting and electrical installation

Monitoring setup and performance visibility

DNO G99 application and approval support

Commissioning, warranties and handover

Manufacturer warranties plus Mercia’s 5-year workmanship warranty

On-site delivery

Live-site scheduling to reduce disruption

Multi-site rollout support

Maintenance and aftercare options

Scaffolding, edge protection and working-at-height access

Electrical certification pack (BS 7671 EIC, G99 commissioning, CDM 2015 duties)

Year 1 performance review against design targets

Business Solar Funding Options

Funding Options for Commercial Solar

Choose outright purchase, a Smart Ease payment plan or a Power Purchase Agreement (PPA) — the right fit depends on your cashflow, tax position and how long you’ll hold the site.

Smart Ease Accredited Channel Partner

Mercia partners with Smart Ease to offer flexible payment solutions for businesses and organisations, with competitive rates, fast approval and practical support for commercial solar projects.

Visit Smart Ease
£0 upfront

Smart Ease payment plans can spread the cost of solar, battery storage and associated equipment over time.

The easy way to start saving while protecting cash flow.

  • Applications up to £150k can be pre-approved online in around 4 minutes, subject to credit criteria.
  • Competitive rates with terms up to 10 years in qualifying cases for solar, battery storage and associated equipment.
  • Lower energy bills can support cash flow, depending on site performance, tariff structure and system design.
Ask about payment plans

Power Purchase Agreement

PPA Options

£0 capital outlay

A third-party provider funds, owns and maintains the system while you buy the electricity it generates at an agreed rate.

Lower upfront risk. Long-term energy savings without owning the asset.

  • Useful for sites that want lower energy costs without buying the system outright.
  • No system ownership, maintenance programme or operational insurance on the asset for the host business.
  • PPA suitability depends on project size, site demand, contract structure and the provider’s approval criteria.
Ask about PPA options

Own the asset

CAPEX Purchase

Own it

Best for businesses that want full ownership of the system and the lifetime value of on-site generation.

Full ownership. Full control of the asset, project scope and long-term savings.

  • Suitable where capital budget is available and the business case is being assessed internally.
  • Mercia can model expected generation, savings and grid impact before you commit to a project scope.
  • Potential tax treatment depends on your company’s position and your own professional advice.
Start a CAPEX enquiry

Funding availability, credit approval, tax treatment and savings depend on the project and business circumstances. Smart Ease is a separate entity; payment plans and PPAs are subject to provider criteria and approval. Mercia does not provide tax, legal or accounting advice.

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Commercial EV charger installed by Mercia Electrical

Popular EV chargers we install

EV Charging

Commercial EV Charging for Workplaces, Fleets and Visitors

Mercia designs and installs EV charging around your site capacity, parking layout and future vehicle demand, with solar and battery storage considered as part of the wider energy plan.

  • 820 EV chargers installed across workplace, fleet and customer-facing projects
  • OZEV guidance where eligible, with £30k savings made for direct customers
  • Project EV, Tesla and Ohme options matched to your use case
Explore our full commercial EV charging services

Battery Storage

Battery Storage for Business

Battery storage helps you keep more of the power you generate on site, reduce peak imports and add resilience where the load profile supports it. For some businesses, solar alone is the right first step; for others, storage strengthens the commercial case from day one.

  • Use stored power when demand (and unit rates) are highest
  • Improve resilience against short-duration grid interruptions
  • Add storage now or phase it later as loads grow
Commercial battery storage and inverter installation by Mercia Electrical
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UK-wide delivery

Nationwide Commercial Coverage

From warehouses in central London to multi-site projects in the Highlands — Mercia delivers commercial solar across 11 UK regions, with active coverage across England, Wales and Scotland.

East Midlands

Derbyshire, Nottinghamshire, Leicestershire, Lincolnshire and Northamptonshire.

West Midlands

Birmingham, the Black Country, Staffordshire, Warwickshire, Worcestershire and Shropshire.

North West

Greater Manchester, Merseyside, Lancashire, Cheshire and Cumbria.

Yorkshire & the Humber

West, South and North Yorkshire, plus Hull and the Humber corridor.

East of England

Cambridgeshire, Norfolk, Suffolk, Essex, Bedfordshire and Hertfordshire.

Greater London

Central London plus inner and outer borough coverage across the capital.

South East

Oxfordshire, Berkshire, Buckinghamshire, Surrey, Kent, Sussex and Hampshire.

South West

Bristol, Somerset, Gloucestershire, Wiltshire, Devon, Cornwall and Dorset.

North East

Tyne and Wear, Teesside, County Durham and Northumberland.

Wales

North, Mid and South Wales including the main commercial and industrial corridors.

Scotland

Central Belt sites plus wider delivery across Fife, the Highlands and Southern Scotland.

Commercial project portfolio

Recent commercial solar installation systems

Featured Commercial Project

Scotswood Industries

A commercial solar installation designed to lower operational costs and reduce the environmental impact of an energy-intensive manufacturing site, alongside EV charging provision for staff and fleet charging needs.

263 kWp system · 446 panels · 4× Solis inverters (200 kW total)

  • 215,890 kWh est. annual generation
  • £43,157 est. annual savings
  • 55 tonnes est. CO2 reduction / yr
  • 3.5 yrs indicative payback

Indicative project outcomes are shared here for case study context; final performance depends on site operations, tariff structure and ongoing usage.

More recent commercial installs

Sports & leisure

Burton Rugby Club

  • 130 kWp system
  • 220 panels
  • 2× SolaX inverters

Education

Wrekin College

  • Old Hall 444 panels · 2× 100 kW SolaX
  • Music Block 204 panels · 60 kW + 30 kW SolaX

Warehouse · 507,000 sq ft

Plot D2

  • 502 kWp system
  • 1,128 JA Solar 445 W panels
  • 4× 110 kW Solis inverters

Awarded by HEB Group

Why 250+ UK Businesses Trust Mercia for Commercial Solar

Planned around real site demand and practical project delivery.

Full turnkey project delivery

Survey, design, DNO applications, installation & commissioning — one commercial workflow.

Commercial electrical expertise

NICEIC-approved electrical expertise that supports safe, coordinated delivery across commercial sites.

Monitoring & aftercare

Real-time visibility into system performance, plus support options after handover.

Solar, battery & EV as one

Plan generation, storage and charging together rather than retrofitting later.

DNO G99 & compliance

Clear support through grid applications, project paperwork & commercial install requirements.

Live-site delivery planning

Projects scheduled around site access, operations & safety requirements wherever possible.

Nationwide & multi-site capability

Support for single-site projects and wider commercial rollouts across the UK.

Full solar system design

Roof layout, inverter sizing, yield modelling and DNO connection planning built around your site, half-hourly usage profile and future energy plans.

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We have partnered with world-leading solar PV system manufacturers

Our commercial installations use premium photovoltaic technology to convert sunlight directly into electricity. Every solar PV system we design is matched to your roof, load profile and long-term energy plans.

SolarEdge – Panel-Level Optimiser Platform

SolarEdge pairs a DC-optimised inverter with panel-level optimisers so each module works at its own peak, rather than being held back by the weakest string. It suits complex commercial roofs with shade, mixed pitches or phased extensions, with three-phase units covering 16 kW to 120 kW and up to 175% DC oversizing.

The monitoring platform gives operations teams panel-level visibility from day one, making it easier to spot underperformance early and validate generation against the forecast.

Commercial inverter warranty is 12 years as standard, extendable to 20 years. SolarEdge’s 360° Safety Solution also supports safe DC during installation and maintenance.

Fox ESS – Commercial Hybrid Inverter & Storage

Fox ESS H3 Pro three-phase hybrid inverters pair with EP and EQ commercial battery stacks, bringing solar generation, storage and backup into one platform. EQ banks scale to roughly 42 kWh, so the system can be designed for today’s load and expanded later without treating storage as a separate project.

FoxCloud monitoring gives site managers a single view of production, consumption and battery state of charge, which helps when solar and storage are managed together.

Hardware warranty is 5 years as standard and extendable to 10 years, with EQ batteries carrying a 12-year warranty. Fox ESS reports 890,000+ global inverter installs across 70+ countries.

SolaX Power – Commercial-Scale Three-Phase Inverters

SolaX X3-FORTH three-phase inverters cover 75 kW to 150 kW for commercial rooftops where smaller string systems cannot scale cleanly. Up to 12 MPPTs per unit give designers more control over shade, pitch changes and multi-orientation arrays, with 99% peak efficiency and export control for DNO constraints.

SolaXCloud supports portfolio monitoring from one dashboard, so performance checks, alerts and fleet visibility stay practical after the first site.

The platform ships into 130+ markets with 3,000+ product certifications and 400+ patents. The X3 series carries a standard 10-year warranty and suits larger roof areas with straightforward service access.

Solis – Reliable Commercial String Inverter Platform

Solis C&I string inverters give commercial rooftops a dependable three-phase generator where simple operation and long-term serviceability matter more than panel-level optimisation. The S6 range covers 25 kW to 60 kW, with the S5-GC100K available for larger 100 kW blocks.

Three to four independent MPPTs per unit, up to 20 A string current and SolisCloud monitoring keep the system practical for varied roof layouts, remote checks and firmware management.

Solis has a long-established global inverter base and an established UK support footprint. The C&I range carries a 10-year standard warranty, making it a sensible fit for clear, repeatable commercial installs.

Mercia Commercial Solar vs Corporate Installers

A practical comparison for businesses choosing between a direct delivery partner and a larger corporate provider.

Features Mercia Electrical Corporate installers
Project planning
Tailored to your site, roof & half-hourly load profile
More standardised packages
DNO G99 & approvals
Guidance and coordination included
Often fragmented across teams
Live-site delivery
Planned around business operations
Less operational flexibility
Solar, battery & EV as one
Planned as a single strategy
Add-ons treated separately
Delivery oversight
Mercia-managed delivery with NICEIC-approved electrical oversight
Delivery approach varies by contractor and region
Hidden Fees
No surprise fees
Additional charges common
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Frequently Asked Questions

Everything UK businesses ask before committing to commercial solar.

How does solar benefit my business?

Commercial solar helps businesses reduce daytime grid imports, gain more control over energy costs and support sustainability reporting. It works best on sites with suitable roof space and strong daytime demand.

Are there payment options to help spread the cost of install?

Yes. Mercia can discuss CAPEX purchase, Smart Ease payment plans, PPA structures on suitable projects and phased delivery depending on your site, budget and project scope.

Will I need battery storage, or is it optional?

Battery storage is optional. It can improve self-consumption, reduce peak imports and add resilience on the right load profile, but solar alone is often the right first step for steady daytime users.

How long will it take for me to pay off the install cost?

Payback varies by system size, site demand, electricity prices, funding route and whether storage is included. Mercia models this during the proposal stage so the business case is based on your site, not a generic estimate.

Will installation disrupt my business operations?

No — installations are planned around live-site access, safety requirements and day-to-day operations wherever possible. Mercia keeps disruption controlled, scheduled and clearly communicated.

Who handles permits and grid connection approvals?

Mercia handles the full process around system design, DNO G99 applications and project coordination end-to-end. Any site-specific approvals are identified early in the survey and proposal stage.

Do I need DNO approval before installation?

Yes — under ENA Engineering Recommendation G99, systems rated above 3.68 kW (or 16 A per phase) on single-phase, or with equivalent three-phase capacity, require G99 approval before connection. Mercia reviews your site and manages the correct application route.

Will I be paid for excess energy via the Smart Export Guarantee?

Potentially, yes. Eligibility depends on your system size, metering setup, supplier arrangements and whether the installation is in Great Britain. Export income should be treated as part of the wider business case rather than the only driver.

Will I have real-time monitoring?

Yes. Commercial systems include monitoring that gives you visibility into generation, performance and system status — helpful for SECR reporting and spotting issues early.

What maintenance is required annually?

Commercial solar is generally low maintenance, but Mercia usually recommends annual panel cleaning and maintenance checks to help keep performance on track. The right schedule depends on system size, site conditions, insurer requirements and operational priorities.

Do you offer maintenance contracts?

Yes. Maintenance and aftercare support can be discussed as part of the commercial proposal, including inspection visits, cleaning coordination, performance checks and remedial support after handover.

Our Commercial Solar Guarantees

Clear cover on workmanship, compliance and ongoing support with the accreditations and contractor standards relevant to commercial installations.

Manufacturer Warranties

Panel, inverter and battery components are covered by manufacturer warranties that vary by product selection and project specification.

Project-specific cover

5-Year Workmanship Warranty

Mercia provides a 5-year workmanship warranty on commercial installations, covering the quality of installation work alongside post-handover support.

Commercial installation cover

MCS Certified

Mercia is MCS certified.

TrustMark

Government endorsed quality

CHAS Accreditation

Health and safety accreditation scheme

NICEIC

Approved contractor for all electrical work in UK

Smart Ease

Accredited channel partner