What is the average solar saving per year?

£580-£1,100/year for a 4kW system depending on battery and tariff. Without battery: £580. With battery: £820. With battery + Octopus Flux: £1,100.

How much over 25 years?

£14,500 (panels only) to £27,000+ (with battery + smart tariff). After subtracting costs (£6,750 + £1,000 inverter replacement): net profit of £6,750-£19,250.

How Much Can I Save with Solar?

By Home Solar Guide Team|Updated 18 March 2026|money

Independently written | Evidence-based | Sources cited

How much you can save with solar — £580-£1,100/year. £14,500-£27,000 over 25 years. Your specific savings depend on 6 factors.

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How much can solar panels save me?

UK solar savings for a typical 4kW system: £580/year without battery, £820/year with battery, £1,100/year with battery + smart tariff (Octopus Flux). Over 25 years: £14,500 (panels only) to £27,000+ (full optimised system). Your specific savings depend on: system size, self-consumption rate, roof direction, location, battery, and electricity tariff. Use our calculator for a personalised estimate based on your postcode and electricity bill.

Frequently Asked Questions

Related: Home Heating Systems

Solar panels are most powerful when combined with an efficient heating system. Heat pumps use solar-generated electricity to heat your home at 300-400% efficiency — making them the ideal partner for solar.

heat pump running costs in the UK

Heat pumps use electricity at 300-400% efficiency, making them ideal partners for solar.

From our sister site Home Heat Pump Guide