Estimate your savings, payback period, system size and more — using real UK sun hours, Ofgem electricity rates and Smart Export Guarantee tariffs. No signup, no email wall.
See your annual savings, payback period and 25-year profit based on your region and roof.
Calculate savings → LivePanel count by your usage and UK region sun hours.
Calculate panels → LiveInstalled cost by system size, with 0% VAT applied.
Calculate cost → LiveReturn on investment over 25 years, with rate inflation.
Calculate ROI → LiveIs a home battery worth it with your tariff?
Calculate battery ROI → LiveWhat your surplus earns — exported kWh and £ per year, by region and SEG rate.
Calculate SEG income → NewCharge your EV with solar — savings vs petrol & grid, % coverage, panels needed.
Calculate EV savings → NewBattery vs no battery, 4kW vs 6kW — see cost, payback & 25-year profit side by side.
Compare options →Real costs, savings, payback periods and who should skip — based on MCS, Ofgem & EST data.
Read guide → NewRightmove 2–3%, Swansea University 6–7%, new-builds up to 16%. The honest answer.
Read guide → NewAll 12 UK regions ranked: South West 7.6 yrs to Scotland 10.0 yrs. City-by-city, why the gap is small.
Read guide →Full price breakdown by system size, what drives the price, 0% VAT impact, how to get cheaper.
Read guide → NewThe 0% relief ends 31 March 2027. The likely new rate and whether to install now or wait.
Read guide → NewECO4, 0% VAT, Warm Homes Local Grant, SEG — who actually qualifies and the scams to avoid.
Read guide → New0–3% loans for solar, batteries and heat pumps. Who qualifies and how to apply.
Read guide → NewAll 10 UK sellers compared: Octopus £450–£650, Argos from £599. Plus the ENA compliance check to run before you pay.
Read guide → NewYour SEG payments don't follow your supply switch. What Ofgem's rules say, and how to keep your export rate.
Read guide →Panel count by house size, usage, roof space and region — with the exact formula.
Read guide → NewJA Solar, LONGi, Jinko, REC, Panasonic, Maxeon — efficiency, warranty, and which makes sense for your roof.
Read guide → NewSouth is best (30–40°), but east/west produce 80–85% and south-east/south-west 95%+. Is your roof suitable?
Read guide → New1–2 day install, but 4–12 weeks total. G98 vs G99, MCS, planning — step by step.
Read guide →Honest payback maths: why tariff arbitrage matters more than solar self-use, real costs, when to skip.
Read guide → GuideEvery UK supplier's SEG rate compared. How much you can earn, eligibility, how to switch.
Read guide → New£1,723 for a typical home — up 4%. Electricity at 26.32p, and what it means for solar.
Read guide → NewWhat "100% renewable" really means under Ofgem's rules, and which tariff actually pays with solar.
Read guide → NewThe £7,500 Boiler Upgrade Scheme, real costs, and the closest thing to a zero-bill home.
Read guide →Legal from 27 August. £400 kits, no electrician, save £70-110/year. Who it's for, safety rules, vs rooftop.
Read guide → NewNew wiring rules from 15 October. Where home batteries can go, and what to check.
Read guide → NewLofts and bedrooms are out. Where a battery can go and how to pick a compliant spot.
Read guide →Nearly zero-maintenance: clean every 12–18 months, replace one inverter. Real costs + the EST checklist.
Read guide → NewDecember output is ~5× less than June, but panels never stop. Real PVGIS month-by-month data.
Read guide →uksolarcalc.co.uk is a free, independent reference tool. Every calculator uses public UK data — PVGIS 5.2 sun hours (European Commission), Ofgem tariff caps, and published Smart Export Guarantee rates.
We have no installer partnerships at present. If we add any, commissions will never change the numbers we show you. See our methodology page for the formulas behind each tool.