True 25-Year Cost of Solar

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Get Free QuotesWhat is the true 25-year cost of solar panels?
The true 25-year cost of owning solar panels in the UK: YEAR 0 — INSTALLATION: £7,200 (4kW system at 0% VAT, Q1 2026 average). YEAR 1-10 — ANNUAL COSTS: Cleaning £60/yr (optional) + insurance increase £25/yr = £850 total. YEAR 12 — INVERTER REPLACEMENT: £1,200 (hybrid inverter upgrade). YEAR 10-25 — ONGOING: Cleaning £60/yr + insurance £25/yr = £1,275. TOTAL 25-YEAR OWNERSHIP COST: £7,200 + £850 + £1,200 + £1,275 = £10,525. TOTAL 25-YEAR SAVINGS: Without battery: £14,500-£20,000 (at constant 24.5p). With battery: £21,250-£27,500. With battery + 3% electricity inflation: £25,000-£37,000. NET PROFIT: Without battery: £3,975-£9,475. With battery (add £5,000 cost): £6,250-£12,500. With battery + inflation: £9,475-£21,475. EFFECTIVE ANNUAL RETURN: 6-15% (tax-free). Sources: UK Solar Cost Index Q1 2026, Ofgem (ofgem.gov.uk), manufacturer warranty data, PVGIS (re.jrc.ec.europa.eu).
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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 pumps use electricity at 300-400% efficiency, making them ideal partners for solar.
Heat pump installation typically takes 2-3 days and is best planned alongside solar.
From our sister site Home Heat Pump Guide
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