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Commercial Solar Panels Calculator

Save energy and become a more sustainable business with commercial solar panel installation.
  • INDUSTRY EXPERTS WITH OVER 50 YEARS COMBINED EXPERIENCE
  • 25 Year Warranty
    On All Panels
  • We Won't be
    beaten on price
  • 5 STAR CUSTOMER SERVICE

Achieve Payback In 2 Years*

Get Your Instant Solar Estimate

kWh/yr

Find this on your electricity bills or smart meter annual summary

Usable south-facing space, excluding vents, skylights and obstructions

Affects how much energy each panel generates per year



This is a general estimate based on typical UK commercial installations.
Get an accurate survey and detailed quote from our expert team.

Get a Free Survey Or call us: 0331 6302 225

Estimates assume south-facing panels at 30° pitch, 80% system efficiency, and 450 Wp panels (2 m² each including spacing). Install costs based on typical UK commercial rates of £700–£1,000/kWp. Actual performance and costs vary. Always obtain a professional survey from an MCS-accredited installer before any investment decision.

As a business, the most important thing is your bottom line, and with the rising energy prices, your profit margins are probably getting smaller. Fight back with commercial solar PV panels and start hitting your sustainability goals too!

Trust ProStar Energy to provide you with an end-to-end service from design to installation to maintenance of your bespoke system so you can keep your attention on running and growing your business.

Arrange a free site survey and quote for commercial solar PV system services by calling our team today on 0331 6302225!

ProStar Energy Engineers carrying a Solar Panel
Solar Panels on a Bournemouth School

How to Use the Solar Panel Calculator

Simply enter three details and hit calculate:

Your annual electricity consumption - you'll find this on your electricity bills or your smart meter's annual summary. If you're unsure, your supplier can provide a 12-month usage figure.

Your available roof area - this is the usable, south-facing space on your roof, excluding skylights, vents, access hatches and any areas affected by shading. If you have multiple roof sections, add together the usable area from each.

Your location - solar panel output varies across the UK, with sites in the South West generating more energy per panel than those in Scotland. Select the region closest to your premises and the calculator will account for local solar yield.

Your results will show the recommended number of panels, your estimated system size in kilowatts peak (kWp), an indicative installation cost range, your annual CO₂ saving, and how much of your current electricity demand solar could realistically cover.

How Many Solar Panels Does a Business Need?

The number of panels a commercial property needs depends on two things: how much electricity you use, and how much roof space you have available.

As a general guide, a business consuming 50,000 kWh per year - typical for a small office, farm or light industrial unit - would need a system of around 50 to 70 panels to cover the majority of that demand. A larger warehouse or manufacturing site using 200,000 kWh annually could require 200 panels or more.

Our calculator uses 450 Wp (watt-peak) high-efficiency panels as its baseline — the standard for most commercial installations in 2025. Each panel requires approximately 2 m² of roof space including mounting clearance.

Because commercial roofs vary so widely in size, orientation and condition, the calculator gives you the lower of two figures: the number of panels your energy demand requires, and the number your available roof space can physically accommodate. If your roof is the limiting factor, we'll flag this clearly so you can discuss options with our survey team.

Meon Springs Solar Installation
  • 25 Year warranty on panels
  • 2 Year workmanship guarantee
  • Installation within just 3 weeks
  • 5000+ Installations completed
  • 25 Installations carried out weekly
  • Experienced, accredited & friendly team
  • Deposit & guarantee protection

Get Your FREE Solar PV Quote

Let us know a few details about your business through this form and a member of our team will be in touch shortly to discuss a quote.
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Sectors We Provide Commercial Solar Panel Installations In

No matter what sector you work in, you can benefit from the energy produced by commercial solar panels. We’ve installed commercial solar systems for a range of commercial and industrial buildings, including:

With bespoke systems made for your business, you can rest assured that your system will meet your individual energy needs. So, whether you are a business in an energy-intensive industry, such as manufacturing or using energy to run an education or care facility, your solar panel system will efficiently power your business.

Discuss your business needs with our expert team and get a quote for our commercial solar panel installation services by calling us on 0331 6302225.

Why Choose ProStar Energy in Dorset?

You want a trusted commercial solar panel supplier that will take the project on as a whole so you can deal with running your business.

We get this, which is why ProStar Energy are a go-to company across the south of England for commercial solar panel installations.

Experience

We have completed over 5,000 installations over the years, giving us an in-depth understanding of all types of solar technology and industry needs.

Warranties

All our parts come with a 25-year warranty and a 2-year workmanship guarantee, so you can rest assured that your commercial solar system is covered in the rare event of anything happening to them.

Customer Service

Your needs are at the centre of all our work, so you can be confident that your solar panel system will meet your energy demands.

Accreditations

Our team are highly accredited, so you can trust their dedication to high standards, quality and excellence.

Finance Options Available

We offer Power Purchase Agreements to fund your installation, making the upfront cost more affordable for you.

Get in touch with our friendly team to discuss adding commercial solar panels to your business to reduce your energy bills and carbon footprint and reach sustainability goals.

Call us on 0331 6302225 today.

Accreditations

Check if you are eligible for FREE Solar with PPA
and see how much your business could save!

Ready to take the next step? Book a free property survey online or give us a call on 0331 6302225 today. Our team is here to support and guide you throughout the entire process, so let’s get started!

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*The payback period will depend on the size of the system and the energy requirements of your facility.

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Main Office:
Unit 7-8 Millstream Trading Estate
Christchurch Road
Ringwood
Hampshire
BH24 3SD

Registered Address:
4 Namu Road
Bournemouth
Dorset
BH9 2QU

Telephone: 03316 302 225

Commercial and Domestic Solar Panels across Dorset, Hampshire, Wiltshire, Berkshire, Sussex and Home Counties
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