A 70kW system is built for energy-intensive businesses - manufacturing, data-heavy operations and agriculture - looking for a serious cut to their running costs. Start with a free assessment of your roof and your bills.
70kW suits energy-intensive manufacturing and processing sitesA 70kW system at a glance
129 x 545W panels for a 70kWp DC array (70,000W / 545W, rounded up).
At 5.45m² per kWp of array installed: 70kWp x 5.45m², about 1.9 tennis courts.
At 850kWh per kWp installed a year: 70kWp x 850kWh.
Moving to solar is a strong move both for the environmental case and, more importantly, for the lower running costs it brings a business. For many, 70kW may seem like a lot, but plenty of industries see profits eaten by the cost of powering the business day to day.
A 70kW system could transform how you power your business and bring significant savings your way.
A 70kW solar power system is large-scale, using around 129 individual 545W panels for a 70kWp DC array, and covering around 382 square metres - roughly two tennis courts.
Under strong sun - full irradiance, around 20% panel efficiency, no shading and six hours of peak sunlight - a 70kW system could theoretically generate up to 420kWh a day. Averaged across a UK year at a more realistic 850kWh per kWp installed, that is closer to 59,500kWh annually.
| Period | Maximum output (kWh) |
|---|---|
| Hourly | 70 |
| Daily | 420 |
| Weekly | 2,940 |
| Monthly | 12,600 |
| Yearly (theoretical max) | 151,200 |
Theoretical maximum under ideal, cloudless conditions. Real-world UK output, at 850kWh/kWp, is around 59,500kWh a year.
Automotive, electronics and chemical production run energy-hungry machinery continuously through the working day.
Server racks and the cooling systems that support them draw power around the clock, much of it in daylight hours.
Dairy and intensive farming can use up to 1,000kWh a month on refrigeration alone.
Cost depends on panel type and efficiency, your inverter choice (string, micro or power optimisers, always three-phase at this size), labour, building regulations approval, roof condition and any electrical upgrades needed. Roughly, you can expect to pay around £70,000 for a 70kW system.
Using the Annual Investment Allowance, the full £70,000 can be set against your taxable profit in the year you buy, since it sits well within the £1m AIA cap. At the 25% main rate of corporation tax, that is worth up to £17,500 off your corporation tax bill.
We provide bespoke system designs for every business, based upon your energy usage and rooftop availability. To give you an idea of the savings and cost of a system, below are some of our common system sizes.
For office buildings
25 yearsPays back in 6.2 yrs
For warehouse buildings
25 yearsPays back in 6.0 yrs
For manufacturing plants
25 yearsPays back in 5.8 yrs
For distribution centres
25 yearsPays back in 5.7 yrs
Illustrative examples, not live quotations. Equipment, warranties and prices are confirmed in your proposal. All savings are based upon a solar generation yield of 850kWh/kWp installed per annum, with usage of 71.43% of solar energy generated, assuming a 24p/kWh electricity import rate (close to the DESNZ Q1 2026 UK non-domestic average of 24.14p/kWh). Savings may change year on year dependent upon weather conditions, energy prices and system degradation in line with warrantied output.
Solar PV brands featured in our system examples
Figures above assume a 24p/kWh electricity rate, close to the Q1 2026 average.
Getting a 70kW system through Business Solar UK is straightforward. We:
The right route depends on your cash position, your lease and how much power you use in daylight. Your free assessment models each one against your own bills, starting with what you can save before a single panel goes up.
Review your electricity tariff whilst planning your solar installation
Best for: Any business on an out-of-contract or uncompetitive tariff
Ask about this route
Pay upfront, keep every pound of the saving
Best for: Profitable businesses with cash or an existing facility, and a long lease or freehold
Ask about this route
Spread the cost, with ownership at the end of the agreement
Best for: Businesses that want ownership without tying up working capital
Ask about this route
Fully funded. You just buy cheaper electricity
Best for: Sites with a large roof and daytime demand that want savings with no capital or maintenance
Ask about this routeFinance and fully funded options are subject to eligibility, survey and contract terms. Savings, repayments and tax relief depend on your circumstances.
When it comes to commercial solar, there are a few ways to purchase your system. We’ll help to guide you through your options.
Using the Annual Investment Allowance, you can deduct the cost of your system against corporation tax.
Spread the cost with asset financing and use your bill savings to pay off your annual loan repayments.
Purchase your system outright, for the best return on investment.
Or pay nothing upfront with a solar power purchase agreement. See all four ways to pay.
Get a forecast based on your building, tariff and daytime electricity use.
We will check if you qualify for any incentives or grants.
Your assessment uses your postcode to check local solar yield, planning rules and the grid connection.
Prefer to talk first? Call 0113 834 0644 or email [email protected].
Your installation is managed by Solar4BusinessInstallation services described below are delivered by our partner Solar4Business.
Our expert in-house team will advise you on how to best save money through a bespoke business solar installation.
A few questions about your business and your solar energy needs.
A 70kW (or similar) package sized to your roof and your usage, with every way to pay modelled.
Solar4Business surveys your roof and installs your system, and we check any grants or incentives available to you.
You start saving on energy bills from the day your system is switched on.
See the range of buildings featured in Solar4Business’s published installation projects, from manufacturing sites to schools.
Commercial solar at industrial scale. A large manufacturing roof put to work generating electricity on site.
Explore the project
Rooftop generation alongside the demands of a busy manufacturing operation.
Explore the project
Using school roof space to generate power where it is needed throughout the day.
Explore the project
A bespoke rooftop installation designed around a business headquarters.
Explore the projectBusiness Solar UK helps you assess your options and introduces you to Solar4Business. Their team surveys your premises, designs the system and manages the installation.
Solar4Business displays the accreditation marks below on its website. Ask for the current certificates, the contracting company’s details and the warranties that apply to your proposed installation.
Founder and CEO, Pharaoh Capital. Founder of Solar4Business and INICIO.
Over ten years in the energy sector. Grant founded Solar4Business, who install every Business Solar UK system, and INICIO, which funds commercial solar with no upfront cost. Institute of Directors Young Director of the Year, 2020.
Business Solar UK assesses your roof and your bills, then hands your project to Solar4Business, our installation partner, who survey, design and install your system. Get your free assessment to see what a 70kW system would look like on your own site.
Get your free solar assessmentReviews are of Solar4Business, who carry out every installation for Business Solar UK. Rating as at 22 September 2026.
"All went well with the initial enquiry, report draft and install. We were kept up to date with install dates and the guys on site were tidy and professional... There has been a marked reduction in our electricity costs which was the reason for the install."
"Steve and his team were extremely professional, installing over 900 panels for our Academy."
"We have a commercial property and 48 solar panels have been fitted. The team of installers were extremely professional and helpful."
"A great installation. Steve and the team did a great job. Would not hesitate to recommend this company."
Brands using solar power
Around 129 x 545W panels for a 70kWp DC array, covering roughly 382m² - about two tennis courts. Your free assessment measures your actual usable roof space.
A 70kW installation needs a three-phase inverter sized to the array, whether a string inverter, microinverters or power optimisers. Your proposal specifies the right type and count for your roof and shading.
Usually not. Non-domestic rooftop solar in England is permitted development with no size cap, within height and set-back limits, and Scotland has similar rights. You will also need Building Regulations sign-off for the installation itself.
The Annual Investment Allowance lets you set the full cost against taxable profit, up to £1m a year. Solar is special-rate plant, so any spend above the AIA can claim a 50% first-year allowance. There is no dedicated national grant for commercial rooftop solar; we check what applies at your postcode.
On suitable sites, yes, through a solar PPA. Our funding partner INICIO pays for the system, which Solar4Business installs. Its maintenance is covered under the agreement, and you buy the electricity it generates at an agreed rate per kWh.
Save massively on your electricity bills when you invest in solar.
