amount of electricity during daylight hours. Offices, manufacturing facilities, warehouses and commercial premises with refrigeration, machinery, lighting or vehicle charging may be able to use much of the electricity as it is generated.

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How Do Commercial Solar Panels Work?

 

Commercial solar photovoltaic panels convert daylight into electricity.

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The panels generate direct-current electricity, which is passed through one or more inverters and converted into alternating-current electricity suitable for use within the building.

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Solar electricity is normally used by the business before electricity is purchased from the grid. It can help power:

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• lighting and office equipment;

• manufacturing machinery;

• heating and ventilation controls;

• refrigeration and cooling equipment;

• data and communications systems; and

• electric-vehicle charging points.

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Where the commercial solar system produces more electricity than the premises are using, the surplus may be stored in a battery or exported to the electricity network.

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Eligible solar installations in Great Britain with a capacity of up to 5MW may be able to receive payment for exported electricity through the Smart Export Guarantee, subject to the applicable metering and certification requirements. Export rates and contract terms are set by participating electricity suppliers.

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Why Install Solar Panels for a Business?

 

For many organisations, electricity is a significant and unavoidable operating cost. Installing commercial solar panels allows part of that electricity to be generated directly from the business premises.

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Reduce Electricity Purchased From the Grid

Electricity generated and consumed on site replaces electricity that would otherwise be purchased from an energy supplier.

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The financial benefit will depend on the size of the system, electricity prices and how closely solar generation matches the building’s normal consumption.

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A business operating mainly during daylight hours may be particularly well suited to solar because electricity can be used as it is produced.

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Protect Against Future Energy-Price Increases

A commercial solar installation cannot remove every energy cost, but it can reduce the proportion of electricity exposed to changing grid prices.

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This may give the business greater certainty when forecasting future operating expenditure.

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Make Better Use of Commercial Roof Space

Warehouses, factories, agricultural buildings and retail units often have large roof areas that generate no direct income.

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Commercial solar panels can turn this unused space into an energy-producing asset without occupying valuable internal floor area.

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Support Environmental Targets

Generating renewable electricity can reduce the organisation’s operational carbon emissions and support wider sustainability objectives.

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The installation may also demonstrate a practical environmental commitment to customers, employees, investors and organisations within the supply chain.

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Support Electric-Vehicle Charging

Businesses introducing electric cars or commercial vehicles may experience increased electricity demand.

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Solar panels can provide part of the electricity required for workplace charging, particularly where vehicles remain at the premises during the day.

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Is Your Commercial Building Suitable for Solar?

 

Commercial solar companies should complete a detailed survey before recommending the size and layout of an installation.

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The assessment should consider more than the available roof area.

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Roof Size and Orientation

Large, unobstructed roofs can accommodate substantial solar arrays. South-facing roofs will generally receive strong solar exposure, but east-facing and west-facing roofs can also generate useful amounts of electricity.

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An east-west arrangement may provide generation across a broader part of the working day.

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Roof Construction and Condition

Commercial buildings may have pitched, flat or shallow-profile roofs formed from metal sheeting, composite panels, tiles, slate or membrane coverings.

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The roof should be assessed to confirm:

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• its current condition;

• its remaining service life;

• the location of structural supports;

• the additional loading created by the panels;

• wind-loading requirements; and

• the most appropriate mounting system.

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Where the roof is likely to require replacement or major repairs soon, it will usually be sensible to complete that work before installing the solar array.

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Rooflights, Plant and Obstructions

Commercial roofs frequently contain rooflights, vents, air-conditioning equipment, flues and other plant.

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The panel layout should maintain suitable access routes and avoid interfering with equipment that needs regular inspection or servicing.

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Shading

Nearby buildings, trees, roof-mounted plant and changes in roof level can cast shadows over the panels.

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A commercial solar installer should model likely shading and explain how it has influenced the proposed layout and estimated generation.

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Electricity Consumption

The system should be designed around the business’s actual energy use rather than simply filling every available section of roof.

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Installers should review electricity bills and, where available, half-hourly consumption information. This can show how much electricity the business uses, when demand occurs and how much solar generation is likely to be consumed on site.

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How Much Do Commercial Solar Panels Cost?

 

The cost of a commercial solar installation will depend on the building, system capacity and complexity of the work.

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Important cost factors include:

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• the number and specification of the panels;

• inverter capacity and quantity;

• roof access and safety equipment;

• scaffolding or lifting equipment;

• mounting and structural requirements;

• cable routes and electrical alterations;

• grid-connection requirements;

• monitoring equipment; and

• battery storage, where included.

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Commercial systems should be compared on their expected lifetime value rather than the initial price alone.

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A lower quotation may use different panels, shorter warranties or less sophisticated monitoring equipment. It may also exclude structural assessments, access equipment, grid applications or other work required to complete the installation.

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The proposal should clearly show the total installed price, VAT treatment, estimated annual generation and assumptions used to calculate potential savings.

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Commercial Solar Panels and Battery Storage

 

A commercial battery can store surplus electricity produced when generation is higher than the building’s immediate demand.

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The stored energy may then be used later in the day, during periods of higher electricity prices or when the panels are producing less power.

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Battery storage may be useful for businesses that:

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• generate more solar electricity than they can use during the day;

• operate into the evening or overnight;

• experience short periods of high electricity demand;

• use time-of-use electricity tariffs; or

• want to increase the proportion of solar generation retained on site.

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A battery is not automatically suitable for every commercial solar project. Its capacity, operating strategy, expected lifetime and financial return should be assessed alongside the solar installation.

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Do Commercial Solar Panels Need Planning Permission?

 

Some rooftop solar installations on non-domestic buildings in England may be completed under permitted development rights. However, the proposal must comply with the relevant limitations and conditions contained within Part 14, Class J of the General Permitted Development Order.

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Planning permission or prior approval may be required where the installation:

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• falls outside the permitted development limits;

• is unusually large or prominent;

• is proposed on a listed building;

• affects a protected or sensitive site;

• involves extensive ground-mounted equipment; or

• is subject to restrictions affecting the property.

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Planning rules differ across the UK, and the position should be checked before work begins.

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Where a full planning application is needed for a commercial property, the submission may require location plans, roof plans, elevations, equipment specifications and information explaining the visual effect of the installation.

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Grid Connection and Exporting Electricity

 

A commercial solar installation must be properly coordinated with the local electricity network.

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Depending on the generating capacity and existing electrical supply, the installer may need to apply to the Distribution Network Operator before the system is connected. Larger systems can require a more detailed connection assessment and may be subject to export limitations or network-upgrade costs.

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The commercial solar company should explain:

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• which connection procedure applies;

• who will prepare the application;

• whether approval is required before installation;

• whether export will be limited;

• any costs imposed by the network operator; and

• how long the connection process may take.

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These matters should be established early, as the available grid connection can influence the final system size and project programme.

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Are Grants Available for Commercial Solar?

 

There is no single nationwide grant available to every UK business installing solar panels.

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Support may occasionally be available through local authorities, regional programmes, business-energy schemes or sector-specific funding. These opportunities can be limited by location, business size, property type and application deadlines.

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Ofgem maintains guidance to help businesses identify current energy-efficiency grants, loans and support schemes, but availability should always be confirmed before a project is financially committed.

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Businesses should be cautious of advertisements implying that every commercial solar installation qualifies for government funding.

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Comparing Commercial Solar Companies

 

A business should obtain detailed proposals from experienced commercial solar installation companies before selecting a contractor.

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Each proposal should identify:

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• the proposed panel layout;

• panel manufacturer and model;

• total generating capacity;

• inverter specification;

• estimated annual generation;

• expected on-site consumption;

• assumed export levels;

• estimated financial savings;

• structural and roof requirements;

• grid-connection responsibilities;

• monitoring arrangements;

• product and workmanship warranties; and

• the complete installed price.

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The calculations should be based on the business’s electricity-consumption data and the specific characteristics of the building.

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A professional installer should also explain any exclusions, risks and assumptions rather than relying on headline savings figures alone.

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Find Commercial Solar Installers Near You

 

Commercial solar projects require careful coordination between the building, roof structure, electrical installation and local electricity network.

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The right commercial solar installer should be able to assess the premises, understand the organisation’s energy use and design a system that is appropriate for both current and future requirements.

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APN Solar helps businesses, commercial landlords and property owners find experienced commercial solar companies serving their area.

 

Whether you are considering panels for an office, warehouse, factory, shop, farm or a wider property portfolio, comparing professional proposals will help you make an informed investment decision.

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