SOLAR PANEL MAINTENANCE & LIFESPAN · UK · 2026
Solar panel maintenance and lifespan
Solar is about as low-maintenance as home tech gets: an occasional clean, one inverter swap in 25 years, and very little else. Here's what upkeep actually costs, how long panels last, and how degradation affects your long-term savings.
Solar panel maintenance costs
What upkeep really costs over a system's life
| Task | Frequency | Typical cost |
|---|---|---|
| DIY clean (water + soft brush) | Every 12–18 months | Free |
| Professional clean | As needed / hard-to-reach | £20–£200 (£4–£15 per panel) |
| Annual service & inspection | Yearly (optional) | £100–£200 |
| Inverter replacement | Once, every 10–15 years | ~£800 (£800–£1,000) |
Sources: Energy Saving Trust, Checkatrade (2026).
Lifespan & degradation
Panels lose roughly 0.5% of output a year, so a system installed today should still deliver around 80%+ of its original generation after 25 years — and many keep going for 30–40. Because there are no moving parts, faults are uncommon; the part most likely to need attention is the inverter, replaced once at about 10–15 years for ~£800.
Keep panels reasonably clean, keep the inverter and wiring in good order, and hold onto your warranty and MCS documents. That's essentially the whole job — which is why solar's running costs barely dent the savings. See the long-run numbers in our savings calculator and whether it all adds up in are solar panels worth it?
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