SolarWise uses real NASA solar data, your local electricity tariffs, and full engineering models to tell you exactly how much you'll save — before you spend a penny on installers.
Real engineering models, real solar data, real tariffs. No installer optimism, no salesperson tricks. The number you get is the number you'll get.
Postcode, roof orientation, shading, electricity usage. We pull real solar irradiance from NASA for your exact location.
System size, battery sizing, expected generation, self-consumption rate, payback period, lifetime savings. Year-by-year forecast included.
Pro generates a PDF you can take to installers. The numbers are yours; the installers have to match them.
Solar irradiance pulled from satellite-derived datasets for your exact coordinates. Not a national average.
Should you add storage? How many kWh? We answer based on usage profile, tariff, and electricity price trajectory.
Year-by-year energy generation, savings, payback, and lifetime ROI. With degradation accounted for.
Smart Export Guarantee, Octopus Agile, Economy 7 — UK tariffs modelled accurately. Plus EU FiT schemes.
No vendor spin. Real numbers, properly conservative assumptions, transparent inputs you can edit.
Pro generates a quote-comparable PDF: kWp, panels, inverter, battery, expected output. Take it to three installers.
Anonymised reports from real households across the UK and EU. Each one is honest about the upside — and the downside.
3-bed semi · Surrey
Detached · Yorkshire
Terrace · Bristol
Cottage · Devon
End-terrace · Manchester
Listed · Lake District
Coastal · Cornwall
Highland · Scotland
Free quote with the essentials. Pro is for installer-comparable reports and detailed engineering output.
One quote. Real numbers. Honest answer.
Full engineering report. PDF for installers. Multi-property. No subscription.
Pro plus annual tariff & data updates.
Prices shown in GBP. Subscriptions billed by Apple or Google — manage in your device settings.
Installer estimates are notorious for overpromising — perfect roof angle, top-tier panels, generous self-consumption assumptions, and a payback period that conveniently lands at exactly 'manageable'. SolarWise has no axe to grind.
Built by a homeowner who burned through three vendor quotes before realising none of them used the same assumptions. SolarWise standardises the maths and makes it boring (which is what you want when spending £8,000).
Solar irradiance data, location-specific. Better than any installer's spreadsheet.
Affiliate kickbacks, vendor sponsorships, hidden fees. We don't sell your enquiries.
Inputs. Edit any assumption — we show our working. The numbers are reproducible.
Within ±10% on payback periods for typical UK homes — comparable to MCS-certified surveys. Inputs you give matter; the more accurate they are, the better the answer.
No. SolarWise has no installer affiliations, no lead-generation revenue, and no sponsorships. We make money from Pro upgrades — that's it.
Today: UK and major EU markets (Germany, France, Spain, Italy, Netherlands). The US is in beta. Australia is on the roadmap.
Pro recommends typical panel and inverter combinations matched to your system size. We don't push specific brands — you choose.
We model shading impact using your description (or a satellite check on Pro). The result is realistic — not the 'optimal' result installers tend to quote.
Tariffs and incentives change. Pro updates your report annually so it stays current. Free reports are accurate at the date they were generated.
Yes — Pro generates a PDF designed exactly for sharing with whoever's signing off the spend.
Free to download. iPhone and Android. Real numbers about a real decision in under a minute.
