Estimate your annual savings, payback period, and long-term return from a plug-in solar system based on your location and setup.
Which direction do your panels face?
How much generated energy you use directly. Higher if you're home during the day.
Current Ofgem cap is 27.69p. Adjust if your tariff differs.
Expected certified kit cost. Adjust for professional installation if applicable.
Estimates assume flat energy prices and no panel degradation. Real savings are likely higher as energy costs rise. Generation figures from PVGIS data for 30–35° tilt with no shading.
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Each city has a base annual yield figure (kWh) for an 800W south-facing system at 30–35° tilt, derived from PVGIS satellite irradiance data with a system performance ratio of 0.82.
We scale this by your system size (400W = 50% of 800W base), orientation factor (south = 100%, east/west = 80%), and self-consumption ratio. Annual saving = usable kWh × your electricity rate. Payback = kit cost ÷ annual saving. 20-year return = (annual saving × 20) − kit cost.
These are conservative estimates. They don't account for energy price inflation (which increases real savings), panel degradation (which marginally reduces them), or potential export income.