Estimate annual savings and payback period for rooftop solar panels.
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How This Works
System size = roof area ÷ 6m² per kWp. Annual generation = size × 850 kWh/kWp/year × orientation factor. Savings = self-used electricity at 24.5p/kWh + Smart Export Guarantee at ~15p/kWh. Install cost ~£1,800/kWp.
A 10–13.5kWh battery (£3,000–5,000) increases self-consumption from ~50% to ~80%, adding £200–350/year saving. Battery-only payback is 10–15 years, but combined system payback can be 8–12 years. Also valuable for power outage protection.