Solar Panel Savings Calculator UK 2026 | ROI & Payback Period
☀️ Solar Panel Savings Calculator UK 2026
Calculate your solar panel installation costs, annual electricity savings, payback period, and 25-year ROI. Get accurate estimates for your home.
☀️ Solar Panels Now 0% VAT + Prices Fallen 40% Since 2020
UK solar installations now have 0% VAT (was 5% before 2022), saving £325-400 on typical 4kW system. Panel prices fallen 40% since 2020 due to manufacturing efficiencies. Average 4kW system £6,500-£8,000 saves £500-£800/year on electricity bills, payback period 7-11 years, 25-year ROI £8,000-£15,000.
£6,500
4kW System Cost (Avg)
£630
Annual Savings (Avg)
9 years
Payback Period (Avg)
0%
VAT on Installation
☀️ Solar Panel Savings Calculator
Calculate your installation cost, annual savings, and payback period:
4kW system is most popular for average UK home. Check roof space - need ~30m² for 4kW.
UK average: 2,700 kWh/year. Check past bills for accurate usage.
Current price cap: 27.69p/kWh (Jan-Mar 2026). Check your bill.
South generates 20% more than Scotland due to sun hours.
Battery adds £3,500-£5,000 but increases self-consumption from 30% to 70%, saves extra £200-300/year.
Export rate paid for excess solar sent to grid. Octopus Flux best for battery owners.
