What maintenance actually involves
A solar system has no moving parts on the roof, so maintenance is mostly watching and occasional checking. The tasks that matter are reviewing production in the monitoring app, an inspection every few years or after severe weather, and cleaning where dust, pollen or bird droppings build up and rain doesn’t wash them off.
Your monitoring app usually shows a problem first: a panel or microinverter producing nothing, or a whole system that drops to zero on a sunny day. Problems caught early cost less to fix, and every sunny day with a dead system is production you don’t get back.
What is on the roofs being maintained
Most home systems installed in recent years use one of two inverter designs. In public installation records for 2023–2025 (Tracking the Sun), 48% used Enphase microinverters, one under each panel, and 27% used a SolarEdge inverter with an optimizer under each panel. Both designs report each panel’s production in their app, which is the cheapest maintenance tool you have: a panel producing much less than its neighbors is the first sign of a problem.
Panels themselves need little. The median panel installed in 2025 converted 21.3% of sunlight into electricity, and panel warranties typically guarantee most of the original output after 25 years. The parts most likely to need attention over a system’s life are the inverter, the wiring connectors and, on older roofs, the flashing around the mounts.
What a maintenance visit includes
- Production review: the technician compares output with past years and with each panel’s neighbors.
- Visual inspection: cracked glass, loose or corroded mounts, damaged wiring, and nests or debris under the panels.
- Cleaning, if needed: soft brushes and low-mineral water, without pressure washers or harsh chemicals.
- Electrical checks: connections, breakers and disconnects, and voltage and current at the inverter.
- Inverter check: error history, ventilation and firmware.
- Written report: what was found, what was done and what needs attention.
Cost factors
| Factor | Impact on cost |
|---|---|
| Type of visit | A cleaning costs less than an inspection with electrical testing. |
| System size | More panels take longer to clean and inspect. |
| Access | Steep or two-story roofs need more safety equipment and time. |
| Soiling | Heavy buildup or bird droppings take longer to remove. |
| Critter guards | Mesh around the edges to keep birds and squirrels out is an add-on. |
When to call a technician
- Production drops in the app and the weather doesn’t explain it.
- After hail, a major storm or heavy snow, to check for damage you can’t see from the ground.
- Visible soiling that rain isn’t washing off.
- Error codes on the inverter or in the app.
- Buying or selling a home with solar, to document the system’s condition.
If the company that installed your system has closed
More than 420,000 home solar systems in the public installation records (Tracking the Sun) were installed by companies that have since closed or gone bankrupt, SunPower, Freedom Forever and Sunnova among them. Routine maintenance on those systems is the easy part: any solar installer can inspect and clean them, and panel and inverter warranties still come from the manufacturers. Before the first visit, make sure you can log in to the monitoring app yourself, since some systems are registered under the installer’s account. See what still works when an installer closes and the active installers on your city’s repair page.
Questions to ask your provider
- What is included in the visit, and what costs extra?
- Do you work on my inverter brand?
- Will I get a written report with photos?
- How do you clean the panels, and is it allowed by my panel manufacturer?
- Are you licensed and insured to work on roofs and electrical systems?
- If you find a problem, how soon can you return to fix it?
What to watch out for
- Cleaners without solar experience. Pressure washers and harsh chemicals can damage panels and void warranties.
- Maintenance contracts you don’t need. In rainy climates, a yearly cleaning plan rarely pays for itself.
- Walking on panels. Stepping on panels can crack the cells inside even when the glass looks fine.
- No report. A visit without a written record is hard to use for a warranty claim later.