Pro Tool
Calculate solar panel ROI for UK properties. Energy savings, export income, payback period, battery storage analysis. Accurate UK irradiance data.
Calculate Your SDLT — FreeA typical 4kW residential system costs £6,000-£8,000 installed in 2025. Adding a 5kWh battery adds £4,000-£5,500. Prices have fallen significantly over the past decade and continue to drop. Our calculator gives you an ROI based on your specific system size and cost.
Most UK solar installations pay for themselves in 7-11 years, depending on system size, location, energy usage, and whether you have battery storage. After payback, energy savings and export income are pure profit for the remaining 15-20+ years of panel life.
The SEG requires UK energy suppliers with 150,000+ customers to offer a tariff for excess solar energy you export to the grid. Rates vary by supplier — typically 3-15p per kWh. You must have a smart meter to qualify. Our tool factors in current SEG rates.
Yes — solar panels work with daylight, not direct sunshine. A well-positioned 4kW system in the UK generates 3,400-4,200 kWh per year depending on location and orientation. South-facing roofs at a 30-40 degree pitch are optimal. Our tool adjusts for your specific region.
Battery storage increases self-consumption (using your own solar instead of exporting cheaply and buying back expensively). With a typical UK household using 50-60% of solar directly, a battery can push this to 80-90%. However, batteries add £4,000-£6,000 and extend payback by 1-3 years. Our tool models both options.