Pro Tool
Calculate Your Solar ROI. Down to the Kilowatt.
The UK property investor's solar analysis tool — energy savings, Smart Export Guarantee income, payback period, and battery storage modelling with real UK irradiance data.
Unlock Solar AnalyserROI Calculator
Solar can be a great investment — but only if the numbers work for your specific property. Propty calculates your payback period based on system size, roof orientation, location, energy usage, and current tariffs. No generic estimates — real numbers for your situation.
Long-Term Savings
Solar panels last 25-30 years. After payback, every kilowatt is profit. Propty models your cumulative savings over the panel lifetime — including energy price inflation — so you can see the true long-term return on investment.
A 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.