Are Commercial Solar Panels Worth It for a Small Business?

Solar panels are increasingly visible on warehouses, offices, workshops, care homes and other commercial buildings across the UK. But for a small business, the important question is not whether solar panels work. It is whether installing them makes financial and practical sense for your particular premises.

For the right business, commercial solar can reduce the amount of electricity purchased from the grid, make better use of otherwise unused roof space and provide greater certainty over part of the company’s future energy costs.

However, commercial solar should not be treated as a standard package. The amount of electricity your business uses, when it uses it, the available roof space, the condition and orientation of the roof and the size of the proposed solar PV system can all affect the potential return.

Portcullis Power Solutions designs and installs solar panels and battery storage for businesses across Cheshire and the North West, with systems designed around the property and its actual energy consumption.

How Do Commercial Solar Panels Save a Business Money?

Solar photovoltaic panels generate electricity from daylight. When your business uses that electricity as it is generated, it reduces the amount of electricity that needs to be purchased from your energy supplier.

This is where the financial case for commercial solar can become particularly interesting.

Many businesses consume a significant proportion of their electricity during normal daylight hours – precisely when a solar PV system is generating power.

This can include:

• Offices operating throughout the working day
• Warehouses with lighting, machinery and handling equipment
• Workshops using electrically powered tools and equipment
• Retail premises
• Care facilities
• Hospitality businesses
• Manufacturing and production premises
• Commercial buildings using air conditioning or ventilation

The more solar electricity that can be used directly on site, the less electricity the business needs to import from the grid.

Why Daytime Electricity Use Matters

One of the biggest differences between commercial and domestic solar is the pattern of electricity consumption.

A household may generate a large amount of solar electricity during the middle of the day when nobody is home. A business, however, may be at its busiest during those same hours.

That can make commercial premises particularly well suited to solar PV.

Imagine a workshop operating machinery, lighting, computers and ventilation from 8am until 5pm. A well-designed solar installation can contribute electricity throughout a substantial part of that working period.

Instead of exporting a large proportion of the generated electricity, the business may be able to consume much more of it directly.

That is why looking at actual electricity consumption is so important when designing a commercial solar installation.

How Quickly Do Commercial Solar Panels Pay for Themselves?

There is no honest single answer to this question.

A commercial solar system’s payback period depends on factors including:

• The cost of the installation
• The size of the solar array
• Annual electricity generation
• How much of that electricity the business uses itself
• The price the business currently pays for electricity
• The amount of electricity exported
• The export tariff available
• Roof orientation and shading
• Whether battery storage is included
• The business’s operating hours and electricity demand

This is why businesses should be wary of generic claims that a solar installation will always pay for itself within a particular number of years.

A proper proposal should use realistic generation estimates and information about your own premises and electricity consumption.

Is a Large Commercial Roof Automatically Good for Solar?

Large roof space can certainly create an opportunity, but size alone does not determine whether a commercial building is suitable.

A solar survey should consider factors such as:

• Roof orientation
• Available unshaded area
• Roof condition
• Roof construction
• Nearby buildings and trees
• Existing roof-mounted equipment
• Safe access for installation and maintenance
• The electrical infrastructure within the building

Warehouses and industrial units can be particularly attractive because they often provide large areas of otherwise unused roof space, but the building still needs to be assessed properly before a system is specified.

Should a Business Install as Many Solar Panels as Possible?

Not necessarily.

Covering every available part of a roof with solar panels may produce the largest possible amount of electricity, but that does not automatically make it the best financial design.

A commercial solar system should be considered alongside the business’s electricity demand.

If the system regularly generates substantially more electricity than the premises can use, a greater proportion of the generation will need to be exported or stored.

For some businesses that may still make sense. For others, a system more closely matched to daytime consumption may provide a better use of the available investment.

This is one of the reasons Portcullis designs solar installations around the individual property’s energy usage rather than simply offering the same standard package to every customer.

What Happens to Solar Electricity My Business Doesn’t Use?

Electricity generated by the solar panels that is not used within the premises can potentially be exported to the electricity grid.

The GOV.UK Smart Export Guarantee guidance explains that eligible homes and businesses generating renewable electricity can receive payments for electricity exported to the grid.

Eligibility requirements apply, and businesses should check the current tariffs and conditions available from SEG suppliers rather than assuming a particular export rate.

Export income can contribute towards the financial return from a solar installation, although for many businesses the greatest value can come from using generated electricity on site and avoiding the need to purchase that electricity from the grid.

Does a Small Business Need Battery Storage With Solar Panels?

No. Solar panels can operate perfectly well without battery storage.

Whether adding a battery makes financial sense depends heavily on when your business consumes electricity.

A business that uses most of its electricity during daylight hours may already be able to consume a high proportion of its solar generation directly.

Another business may generate surplus electricity at certain times but have significant demand later in the day. Battery storage could allow some of that surplus generation to be stored and used later rather than immediately exported.

Battery storage may be worth considering where:

• Solar generation regularly exceeds daytime demand
• The business operates into the evening
• There are predictable periods of high electricity consumption later in the day
• The business wants to increase its use of self-generated electricity
• Future expansion is likely to increase electricity demand

Portcullis installs both commercial solar PV and battery storage, allowing the two technologies to be considered together rather than treating the battery as an automatic add-on.

Can Commercial Solar Work With EV Charging?

Yes, and for some businesses the two can complement each other particularly well.

If employees, company vehicles or a commercial fleet are charged at the premises during daylight hours, some of the electricity generated by the solar system may be used towards vehicle charging.

This does not mean an EV will always charge entirely from solar power. Available generation changes throughout the day and throughout the year, while vehicle charging demand also varies.

However, considering solar generation and EV charging together can help a business make better use of its own electricity.

Portcullis provides commercial electrical work alongside solar installations, allowing renewable generation, EV charging and the wider electrical infrastructure of a property to be considered as part of the same project.

What Types of Small Business Can Benefit From Solar?

Commercial solar is not restricted to enormous factories and distribution centres.

Potentially suitable premises can include:

• Small industrial units
• Warehouses
• Garages and vehicle workshops
• Offices
• Retail premises
• Care homes
• Hotels and hospitality businesses
• Farms and agricultural businesses
• Schools and community buildings
• Manufacturing businesses

The important factors are the property itself and its electricity consumption, not simply the industry in which the business operates.

What if My Business Rents Its Premises?

Renting does not necessarily rule out commercial solar, but it introduces additional considerations.

The business will normally need to establish what alterations are permitted under the lease and obtain the appropriate permission from the property owner or landlord.

The remaining length of the lease can also be important when considering the financial case for investing in equipment attached to the building.

In some situations, the landlord may be interested in contributing to or arranging the installation themselves, particularly where solar could improve the long-term attractiveness or energy performance of the commercial property.

These issues should be resolved before committing to an installation.

Can Solar Panels Reduce a Business’s Carbon Emissions?

Generating renewable electricity on site can reduce the amount of electricity a business needs to draw from the grid.

For companies working towards sustainability or carbon-reduction objectives, solar PV can therefore form part of a wider energy strategy.

There can also be commercial reasons for demonstrating environmental improvements. Customers, procurement teams, larger contractors and supply-chain partners increasingly ask businesses about environmental performance.

Solar should not be treated as a substitute for improving energy efficiency, but it can complement measures such as LED lighting, efficient equipment, improved controls and better energy management.

What About Winter and Cloudy Weather?

Solar panels do not require hot weather to generate electricity. They generate from daylight, although output naturally varies according to available solar radiation.

A commercial solar system will therefore generate considerably more electricity at some times of year than others.

That seasonal variation should already be incorporated into a realistic annual generation estimate.

A business should never assess a proposed system based on what it might produce on one perfect summer day. The useful figure is its expected generation across the year and how that compares with the business’s annual and daytime electricity consumption.

Will My Business Still Need Electricity From the Grid?

In most cases, yes.

Commercial solar is generally designed to work alongside the grid rather than replace it completely.

Generation varies with daylight and weather, while the electricity demand of a business can change throughout the working day.

When the premises requires more electricity than the solar panels are generating, additional electricity can be imported from the grid in the normal way.

When generation exceeds demand, surplus electricity may be stored in a battery where fitted or exported to the grid.

What Happens During a Power Cut?

This is an area where it is important not to make assumptions.

A standard grid-connected solar PV system will not necessarily continue powering a commercial property during a power cut. Systems are designed with safety requirements that prevent inappropriate export onto a disconnected electricity network.

Some appropriately designed battery systems can provide backup functionality, but this needs to be specifically incorporated into the system design.

If maintaining power to particular equipment during an outage is important to your business, mention this during the initial survey rather than assuming that installing solar panels automatically provides emergency power.

Do Commercial Solar Panels Require Maintenance?

Solar PV systems are relatively low maintenance, but that does not mean they should simply be installed and forgotten for decades.

Businesses should monitor system performance so that an unexpected reduction in generation can be identified rather than going unnoticed.

Depending on the installation and environment, periodic inspection can help identify issues involving:

• Panels and mounting systems
• Electrical connections
• Inverters
• Battery storage
• Monitoring equipment
• Damage or deterioration
• Unexpected reductions in output

Portcullis provides solar PV and battery maintenance and repair services, including for systems originally installed by another contractor.

What Should I Ask Before Getting Commercial Solar?

Before deciding whether to proceed, a business should be able to get clear answers to some basic questions.

• How much electricity does our business currently use?
• How much of that consumption occurs during daylight hours?
• How much electricity is the proposed system expected to generate annually?
• How much of that generation are we likely to use ourselves?
• How much could be exported?
• Is battery storage worthwhile for our usage pattern?
• Is the existing electrical installation suitable?
• Is the roof suitable for the proposed system?
• What warranties apply to the panels, inverter and battery?
• What monitoring will be provided?
• What certification will we receive?
• What assumptions have been used to calculate the projected payback?

If an installer cannot clearly explain how the proposed system relates to your actual electricity consumption, it is difficult to judge whether the financial projections are realistic.

Why the Cheapest Solar Quote Is Not Necessarily the Best

A commercial solar installation is expected to operate for many years, so comparing quotations purely on the initial price can be misleading.

Businesses should also compare:

• The proposed system size
• Expected annual generation
• Panel and inverter specifications
• Battery capacity where applicable
• Installation standards
• Monitoring provision
• Product and workmanship warranties
• Certification
• Aftercare and maintenance support
• The assumptions behind projected savings

A cheaper system that is poorly matched to the building or the company’s energy consumption may provide a worse long-term return than a properly designed installation.

Commercial Solar Panels in Cheshire

For Cheshire businesses, solar can be particularly attractive where commercial premises have usable roof space and significant daytime electricity consumption.

Portcullis Power Solutions designs and installs commercial solar PV and battery storage systems across Cheshire and the North West.

Every system is assessed around the individual property, roof, orientation, shading and electricity usage rather than using a standard package.

Because Portcullis also provides commercial and industrial electrical services, the wider electrical installation can be considered as part of the project rather than treating the solar array in isolation.

So, Are Commercial Solar Panels Worth It?

For many small businesses, they certainly can be – particularly where the premises has suitable roof space and consumes significant amounts of electricity during daylight hours.

But the answer should come from the figures rather than from a generic sales claim.

A good commercial solar proposal should show you:

• What the system is expected to generate
• How much of that electricity your business could use
• How much grid electricity it could potentially displace
• What happens to surplus generation
• Whether battery storage adds worthwhile value
• What the realistic financial return could look like

If those figures work for your business and the property is suitable, commercial solar can turn unused roof space into a long-term source of electricity while reducing exposure to grid energy costs.