One of the strongest selling points of solar panels is how little maintenance they require. No moving parts, no consumables, and British rain does most of the cleaning. But "low maintenance" does not mean "no maintenance." Here is what you actually need to do — and what you can safely ignore.
Cleaning: Let the Rain Handle It
In most of the UK, panels require no manual cleaning. Rain removes dust, pollen, and bird droppings effectively. Studies consistently show that professional cleaning improves output by only 1-3% in temperate climates like the UK, rarely justifying the £100-£200 cost of a professional clean.
Exceptions exist: panels installed at a shallow angle (below 15 degrees) may not self-clean as effectively. Panels under trees where bird droppings accumulate heavily may benefit from an annual clean. Panels near construction sites or motorways where industrial dust settles may need attention. In these cases, clean with a soft brush and clean water — never use abrasive materials, pressure washers, or cleaning chemicals.
Inverter Replacement: The One Planned Cost
Solar panels last 25-30+ years with minimal degradation (approximately 0.4% per year for modern N-type panels). Inverters, however, typically last 10-15 years. A replacement string inverter costs £500-£1,000. Microinverters last longer (20-25 years) but cost more to replace if individual units fail.
Many homeowners install with a hybrid inverter from the start (£1,000-£2,000), which supports adding battery storage later without replacing the inverter. This forward-thinking approach can save £500-£1,000 compared to retrofitting a different inverter type when adding a battery.
Monitoring: Catch Problems Early
Modern solar systems include monitoring apps (GivEnergy, Tesla, SolarEdge, Enphase) that track generation in real-time. Check your monitoring app weekly — a sudden drop in output usually indicates a panel fault, inverter issue, or new shading (tree growth, new construction). Most problems are caught within days when monitoring is active versus months when relying on electricity bills.
Insurance and Warranties
Solar panels should be covered by your home insurance — notify your insurer when installing. Most home insurance policies cover solar panels as part of the building structure at no additional premium. The key warranties to track are the product warranty (defects in manufacturing, typically 12-25 years) and the performance warranty (guaranteed minimum output, typically 84-92% at 25-30 years). Keep your MCS certificate and warranty documents safe — you will need the MCS certificate for SEG eligibility.
Annual Checklist
Once a year, preferably in spring before peak generation season, you should visually inspect panels from ground level for damage or heavy soiling, check the monitoring app for any underperforming panels, verify the inverter display shows no error codes, ensure nothing new is shading the panels (tree growth, aerials, neighbouring construction), and check roof mounting points for any visible damage or loose fixings.
Professional maintenance inspections (£100-£150) are optional but recommended every 3-5 years. The installer should check electrical connections, test isolation switches, inspect mounting hardware, and verify system performance against expected output. For commercial systems, annual professional inspections are standard practice and often required by insurance policies.