Solar Panel ROI Calculator
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How do I calculate solar ROI?
Solar ROI formula: (Total 25yr Savings - Total Costs) ÷ Total Costs × 100 = ROI%. Example: (£14,500 savings - £7,750 costs) ÷ £7,750 × 100 = 87% ROI (conservative). With battery + smart tariff: (£27,000 - £16,250) ÷ £16,250 × 100 = 66% ROI. With electricity price inflation (3%/yr): ROI climbs to 150-400%. Use our calculator for a personalised ROI based on YOUR postcode, roof, and consumption.
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