
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.
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.
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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.
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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.
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.

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.
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.
Our team are highly accredited, so you can trust their dedication to high standards, quality and excellence.
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.
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!
*The payback period will depend on the size of the system and the energy requirements of your facility.
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Unit 7-8 Millstream Trading Estate
Christchurch Road
Ringwood
Hampshire
BH24 3SD
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4 Namu Road
Bournemouth
Dorset
BH9 2QU
Telephone: 03316 302 225