Solar panels can be an attractive investment for commercial buildings looking to reduce energy costs, improve energy performance and plan for a lower-carbon future.

But before a business commits to a solar PV installation, it needs to answer one important question:

Is the building electrically ready?

A commercial solar project is not just a roofing decision. It affects the building’s electrical infrastructure, distribution, metering, grid connection, isolation, controls, maintenance access and future energy strategy.

For landlords, facilities teams and business owners, early electrical checks can help avoid delays, unexpected costs and design changes once the project is already underway.

At Azure Electrical Ltd, our electrical services, electrical installation, statutory compliance and wider mechanical services support commercial clients planning practical building upgrades.

This guide explains the key electrical checks businesses should complete before investing in commercial solar panels.

Why Solar Readiness Matters

Solar PV can support a wider commercial energy strategy, but the building needs to be suitable before installation begins.

A solar PV project may involve:

• Connection to the building’s electrical system

• Distribution board review

• Metering considerations

• Export arrangements

• DNO notification or application

• Cable routes

• Isolation points

• Fire safety considerations

• Roof access coordination

• Inverter locations

• Future battery storage planning

• EV charging coordination

• Testing, commissioning and handover records

If these are not considered early, the project can become more complicated.

For example, a business may discover that the distribution equipment needs upgrading, there is limited space for inverter equipment, the cable route is more disruptive than expected, or the proposed system needs a formal grid connection process before it can operate.

The best time to identify those issues is before the business commits to the final design.

Solar Panels and Commercial EPC Improvement

Solar panels often come up when businesses are looking at EPC improvement.

A commercial EPC rates a building’s energy performance from A to G. GOV.UK explains that business premises usually need an EPC when they are built, sold or rented.

Official reference: GOV.UK Energy Performance Certificates for your business premises

Solar PV may help support a building’s energy strategy, but it should not be treated as the only answer to EPC improvement.

For many commercial buildings, solar should be considered alongside:

• LED lighting upgrades

• Lighting controls

• Heating controls

• Ventilation performance

• Air conditioning efficiency

• Electrical capacity

• Metering and monitoring

• Heat pump readiness

• EV charging plans

• Building fabric improvements

Azure’s guide on how to improve a commercial EPC rating with electrical upgrades is a useful companion article for businesses looking at the wider picture.

1. Review the Building’s Existing Electrical Infrastructure

The first step is to understand the building’s current electrical setup.

Before planning solar PV, facilities teams should review:

• Incoming supply arrangement

• Main distribution equipment

• Existing distribution boards

• Spare capacity

• Labelling and documentation

• Existing electrical load

• Plant and equipment demand

• Previous alterations

• Space for new equipment

• Condition of switchgear

• Access for installation and future maintenance

This review helps determine how easily solar generation can be integrated into the building.

If distribution boards are full, poorly labelled, outdated or already supporting heavy loads, remedial work may be needed before solar PV can be connected safely and practically.

Azure’s electrical remedial work service can support businesses where defects, limitations or upgrade requirements are identified during the planning stage.

2. Understand Import, Export and Grid Connection Requirements

A solar PV system generates electricity. Depending on the size of the system and how the building uses energy, some of that electricity may be used on site and some may be exported to the grid.

That means grid connection requirements need to be understood early.

In the UK, small generation systems are commonly handled under engineering recommendations such as G98 or G99, depending on size and connection characteristics.

The Energy Networks Association explains that generation with a capacity greater than 3.68kW per phase falls under EREC G99. Its guidance also points users towards G98 and G99 forms through the ENA Engineering Database.

Official reference: Energy Networks Association: Connecting commercial generation to the electricity networks

For many commercial solar projects, the DNO process can affect timelines. Facilities teams should not assume that panels can simply be installed and connected without checking the required application, notification or approval route.

Before investing, ask:

• Who is responsible for the DNO application or notification?

• Is the proposed system G98 or G99?

• Is export limitation being considered?

• Is the site likely to export energy?

• Will approval be needed before installation or energisation?

• Are timescales realistic?

• Has the installer reviewed the local network requirements?

This should be clarified before orders are placed.

3. Check Whether the Distribution System Can Accept Solar Generation

Solar PV changes how electricity flows within the building.

The electrical system must be suitable for the proposed connection arrangement.

Checks may include:

• Main switchgear suitability

• Distribution board condition

• Protective devices

• Cable capacity

• Earthing arrangements

• Labelling

• Existing load profiles

• Fault levels where relevant

• Isolation arrangements

• Whether new distribution equipment is needed

A building may have enough roof space for panels but still need electrical works before the system can be connected properly.

That is why solar readiness should include an electrical infrastructure review, not just a roof survey.

4. Plan Inverter Locations Carefully

The inverter is a key part of a solar PV system because it converts DC electricity from the panels into AC electricity that can be used by the building.

Inverter locations need careful planning.

Facilities teams should consider:

• Distance from panels

• Distance to distribution equipment

• Ventilation around inverter equipment

• Access for servicing

• Noise considerations

• Security

• Plant room space

• Wall strength and mounting

• Cable routes

• Heat build-up

• Fire safety considerations

• Future replacement access

A poorly chosen inverter location can make installation harder and maintenance more disruptive.

For commercial buildings, inverter placement should be coordinated with electrical design, fire strategy, building access and maintenance planning.

5. Review Cable Routes Before Installation

Cable routing can be one of the most disruptive parts of a solar PV project if it is not planned early.

A route may need to pass through:

• Roof areas

• Riser cupboards

• Plant rooms

• Ceiling voids

• Corridors

• External walls

• Switch rooms

• Occupied areas

• Tenant spaces

• Fire compartments

The route should be practical, protected and maintainable.

Facilities teams should ask:

• Where will DC and AC cables run?

• Will the route affect occupied areas?

• Will ceiling access be required?

• Is containment already available?

• Are fire-stopping measures affected?

• Can the work be completed out of hours if needed?

• Will future maintenance access be possible?

For offices, schools, pubs, clubs and assisted living environments, disruption planning is especially important because buildings are often occupied while works take place.

Azure supports office and corporate sites, education settings, pubs, clubs and assisted living environments.

6. Think About Isolation, Labelling and Emergency Access

Solar PV systems need suitable isolation and labelling so they can be operated and maintained safely.

This is especially important because solar PV systems can continue generating when light is available.

A commercial solar readiness review should consider:

• DC isolation

• AC isolation

• Labelling

• Main switch room notices

• Fire service information where required

• Emergency shutdown arrangements where applicable

• Access for maintenance engineers

• Safe working space

• As-installed documentation

Clear labelling and isolation are important for future maintenance, fault finding, emergency response and building handover records.

7. Make Sure the Project Aligns With BS 7671

BS 7671 is a major standard for electrical installation work in the UK.

Azure Electrical Ltd references BS 7671 when carrying out electrical work, alongside other relevant regulations, manufacturer guidance, site requirements and health and safety duties.

Official reference: IET: About BS 7671

Solar PV systems also have specific electrical considerations. The IET’s Code of Practice for Grid-connected Solar Photovoltaic Systems sets out requirements for the design, specification, installation, commissioning, operation and maintenance of grid-connected solar PV systems.

Official reference: IET Code of Practice for Grid-connected Solar Photovoltaic Systems

Azure has also written a dedicated article on BS 7671 Amendment 4 and what businesses need to know.

Facilities teams do not need to understand every technical detail. However, they should appoint competent contractors who understand current electrical standards and provide proper certification, testing and handover information.

8. Consider Roof Access, Fire Safety and Building Coordination

Solar panels are installed on or near the building fabric, so the project needs coordination beyond the electrical design.

Facilities teams may need to consider:

• Roof structure

• Roof condition

• Access routes

• Plant already on the roof

• Fire safety strategy

• Maintenance walkways

• Fragile roof materials

• Working-at-height arrangements

• Existing lightning protection

• Drainage and roof penetrations

• Warranty or landlord requirements

GOV.UK has published research into the fire safety implications of rooftop photovoltaic panels, including thermal exposure to roofs from fires involving PV panels.

Official reference: GOV.UK Fire safety: solar photovoltaic panels on roofs

For commercial buildings, the key point is that solar PV should be coordinated with the building’s wider safety, maintenance and access arrangements.

9. Check Whether Battery Storage or EV Charging Is Planned Later

Solar readiness should not only look at the system being installed today.

Many businesses considering solar are also thinking about:

• Battery storage

• EV charging

• Heat pumps

• Smart controls

• LED lighting

• Metering and monitoring

• Demand management

These future upgrades can affect electrical capacity, distribution design and control strategy.

For example, a site may install solar PV now and EV charging later. If the electrical design does not account for future expansion, the business may need additional upgrades sooner than expected.

Azure’s article on EV charging infrastructure and electrical capacity explains similar principles around supply capacity and future electrical demand.

For heat pump planning, Azure’s guide on commercial heat pump electrical requirements is also relevant.

10. Review Metering and Energy Monitoring

Solar PV is most useful when the business understands how energy is being generated, used and exported.

A commercial site should consider:

• Existing metering

• Import and export arrangements

• Sub-metering

• Tenant metering

• Energy monitoring dashboards

• Half-hourly data where available

• Out-of-hours base load

• Peak demand patterns

• How solar generation matches site usage

A building that uses most of its electricity during daylight hours may be able to use more solar generation on site. A building with different usage patterns may need a more detailed review.

Energy monitoring helps the business understand whether solar PV should be combined with controls, battery storage, load shifting or wider efficiency upgrades.

11. Do Not Ignore Lighting and Controls First

Solar PV can reduce grid electricity use, but it should not be used to cover avoidable waste.

Before investing in solar, businesses should ask whether energy demand can be reduced first.

That may involve:

• LED lighting upgrades

• Occupancy sensors

• Daylight controls

• Better heating schedules

• Improved air conditioning controls

• Ventilation maintenance

• Control panel review

• Out-of-hours usage checks

• Staff energy awareness

• Better zoning

Reducing demand first can improve the case for solar because the system can then be sized around a more efficient building.

Azure’s article on LED lighting and EPC ratings explains why lighting is often one of the most practical starting points for energy improvement.

12. Make Sure Records and Handover Documents Are Clear

A commercial solar PV project should leave the building owner or facilities team with clear records.

These may include:

• Electrical certificates

• System design information

• Inverter details

• Panel information

• Test results

• DNO correspondence

• Operation and maintenance manuals

• Isolation information

• Labelling records

• As-installed drawings

• Maintenance recommendations

• Warranty information

• Emergency information where relevant

Clear handover records matter because the system will need to be maintained, inspected, understood and possibly altered in future.

Poor documentation can make future maintenance, insurance discussions, landlord reviews and compliance checks more difficult.

Azure’s statutory compliance service can support businesses that need better electrical records, testing and ongoing compliance planning.