Free for UK businesses and public bodies. No sign-up.
Add your postcode and roof size. You get system size, savings and payback straight away, then a full 25-year model and a report you can share with your finance team.
Commercial solar in the UK now stands up without subsidy. Here is why organisations are acting now.
Grid prices have risen sharply and stay volatile. Solar on your own roof gives finance teams more cost certainty.
SECR, supply chain pressure and net zero plans all push down Scope 2 emissions. Rooftop solar is one of the most direct steps you can take.
Commercial panels have been deployed for over two decades. Failure rates are low, warranties long and the UK installer market is competitive.
Output can be modelled with confidence before a panel goes on the roof, so the business case stands up to scrutiny.
Buy outright, finance, lease, or sign a Power Purchase Agreement with no upfront cost. Compare the options.
In England, on-site solar is exempt from business rates until 31 March 2035, and roofs need no extra land.
The calculator models all three, on their own or mixed across one site.
The most common choice. Pitched and flat roofs on factories, warehouses, schools and offices, using space you already have.
Model a roof
Spare land next to your site. Panels can face the best direction, but planning and cabling cost more.
Model a ground array
Shelter for cars, a base for EV chargers, and generation from space that does nothing else. The dearest option per kWp.
Model a carportUK average sunshine, 25p/kWh, pitched roof, buying outright, with 70% of the solar used on site. That is the top of the usual range for a warehouse.
Run your own numbersA fast, detailed first estimate for your site, with a report you can download and share. How it works.
A no-obligation assessment confirms the structure, checks shading, reviews your meter data and builds a detailed financial model.
Design, MCS-accredited installation, DNO approval and commissioning, managed end to end. What can slow it down.
How much solar a site uses itself drives the return. Read the guide for your sector.
Factories, warehouses, retail and leisure. Big roofs and daytime demand.
Read the guide24/7 demand means almost every kWh is used on site.
Read the guideSchools, leisure centres, depots, car parks and new funding routes.
Read the guideWhat rooftop solar can and cannot do, and where the bigger wins are.
Read the guideA detailed, downloadable 25-year model in under three minutes. No sign-up.
