What maintenance do solar panels need?
Almost none. Panels have no moving parts, and rain does most of the cleaning. The only genuinely useful habits are glancing at your production data occasionally and keeping vegetation from growing into the array's line of sight.
Cleaning: usually not worth it
Dust and pollen typically cost 2–5% of output, and rain resets most of it. On a 7 kW system that is roughly $30–60 a year — less than a cleaning service charges. Cleaning is worth paying for in genuinely dusty, rain-free climates, under heavy bird traffic, or near agricultural or industrial dust.
The one habit worth building
Check your monitoring app monthly and compare against the same month last year. A sudden drop means something is wrong: a failed microinverter, a tripped breaker, a shading change, or a dead string. Systems can sit half-broken for a year because nobody looked — that is the expensive failure mode, not dirt.
A realistic schedule
| When | What | Cost |
|---|---|---|
| Monthly | Glance at production vs the same month last year | Free |
| Annually | Look for new shade — trees grow. Check for bird nests underneath. | Free |
| Every 3–5 years | Professional inspection of wiring, mounts and flashing | $150–300 |
| Year 10–15 | Expect to replace a string inverter | $1,500–3,000 |
Snow and leaves
Snow generally slides off pitched panels within a day or two, and clearing it is rarely worth the risk of being on an icy roof. Leaves matter more where they collect at the bottom edge and stay wet. More on winter output →
Before you buy
Ask who warranties the roof penetrations, not just the panels. Leaks are the expensive failure, and they are a workmanship issue rather than an equipment one. Check your roof is ready →
What this looks like in real cities
Measured rooftop data, spanning the range from fastest to slowest payback we have found:
| City | Sun hrs/yr | Rate | Payback |
|---|---|---|---|
| Boston, MA | 1,446 | 30.1¢ | 5.4 yrs |
| Columbia, MD | 1,505 | 18.3¢ | 8.8 yrs |
| Fort Wayne, IN | 1,468 | 15.3¢ | 10.6 yrs |
| Dartmouth, NS | 1,405 | 18.3¢ | 13.2 yrs |
| Montreal, QC | 1,384 | 7.9¢ | 30.7 yrs |
Frequently asked
How often should solar panels be cleaned?
For most homes, never on a schedule. Rain handles it. Consider cleaning in dry dusty climates, under heavy bird traffic, or if you see an unexplained output drop.
Do solar panels need servicing like a boiler?
No. There is no annual service requirement. A professional inspection every few years is sensible but not mandatory.
What happens if a panel fails?
Output drops by roughly that panel's share. With microinverters or optimisers only that panel is affected; on a string inverter a failure can drag down the whole string.
Related guides
General information, updated 2026-08-22. Not financial, tax or engineering advice.