Solar Panel Calculator for United Kingdom
Solar is a solid investment across the UK despite the cloudier climate, thanks to high electricity prices, 0% VAT on installs and export payments. This free solar calculator estimates your system size, payback and savings in pounds using local rates and sun hours.
Calculate my solar payback in United Kingdom →
Solar at a glance in United Kingdom
Even at UK sun levels, high electricity prices and 0% VAT mean payback commonly lands in the roughly 8–12 year range on a 25-year system.
| Currency | British pounds (GBP) |
|---|---|
| Typical electricity rate | £ 0 per kWh |
| Installed cost | ≈ £ 2 per watt |
| Peak sun hours | ≈ 2.8 hours/day |
| Export / buyback | ≈ £ 0 per kWh |
Indicative 2026 starting points — every figure is editable in the calculator, and results depend on your own bill, roof and installer quotes.
A typical 4 kW system in United Kingdom
At around £ 2 per watt, a 4 kW rooftop system costs roughly £ 6,800 and produces about 3,189 kWh in its first year at United Kingdom's 2.8 peak sun hours a day. Your real numbers depend on your roof, shading, panel choice and how much power you use during the day — run your own figures in the calculator to see your exact payback, net savings and ROI.
How the solar calculator works
- Your setup. United Kingdom and British pounds are pre-selected, with local electricity rate, install cost and sun hours filled in. Enter your monthly bill, or size the system from your appliances.
- Your roof. Search your address or tap “use my location”, then draw your roof on the satellite map — or just type its area. We check the system fits and read local sun hours from NASA data.
- Your results. Instantly see your payback period, net savings, ROI, system size, year-1 production and lifetime CO₂ offset — compare cash vs. a loan, and download a PDF report.
Common questions — solar in United Kingdom
How many solar panels do I need in United Kingdom?
It depends on your electricity use, roof space and local sun hours (about 2.8 peak sun hours/day here). A 4 kW system of high-wattage panels is a common starting point for a home — enter your bill or appliances and the calculator gives your exact panel count and system size.
Does United Kingdom have net metering?
The UK doesn't use classic net metering — instead the Smart Export Guarantee (SEG) requires larger suppliers to pay you for each unit you export, at a rate that varies by tariff. The calculator models this as your export/buyback rate.
Are there solar subsidies or incentives in United Kingdom?
There is no cash grant, but residential solar installs are zero-rated for VAT (0%) through the current relief, which lowers the up-front cost. Some low-income schemes (e.g. ECO4) exist for eligible households.
How much does a solar system cost in the UK?
A typical 4 kW home system is around £ 6,800 at about £ 2 per watt installed (0% VAT). Adding a battery raises that — the calculator prices your own size.
Is solar worth it in the UK?
For most homes with a reasonable south-ish roof, yes — high grid prices and export payments mean it pays back well within the panels' life. Enter your bill to see your payback.
Work out your system size
Not sure how big a system you need? These guides work back from your monthly usage:
500 kWh/month 1,000 kWh/month 1,500 kWh/month 2,000 kWh/month 2,500 kWh/month 3,000 kWh/month
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