Common Solar Panel Problems and How to Fix Them
Most solar problems fall into a short list: reduced output (usually soiling, shading, or a failing component), inverter faults (the component most likely to need service during your system's life), monitoring or communication gaps (often just a Wi-Fi issue, not a production issue), and physical damage from storms or debris. A quick way to triage: check the monitoring app first, since a "problem" is often the app losing connection while the system keeps producing fine.
Start with the monitoring app, not the roof
The single most common false alarm is a monitoring gap: the app shows no data, and the homeowner assumes the system stopped producing. Frequently the panels are working normally and only the Wi-Fi connection to the monitoring gateway dropped.
Before assuming a production problem, check: is the router or gateway powered on, has your home Wi-Fi password changed recently, and does the outage in the app correspond to an actual dip in your utility bill's usage credit, or only to a gap in the app's graph?
Reduced output: the usual suspects, in order of likelihood
- Soiling. Dust, pollen, and debris reduce output gradually. Panels in low-rainfall regions accumulate more between natural washes.
- New shading. Trees grow. A roof plane that was clear at installation can develop partial afternoon shade years later.
- A single failing panel or connector. On a string inverter system this can drag down the whole string's output; on a microinverter or optimizer system it usually shows up as one panel underperforming in the monitoring app, which is much easier to isolate.
- Seasonal sun-hour changes. Some of what looks like a "problem" is simply winter versus summer sun hours. Compare the same month year over year, not adjacent months.
Inverter faults
The inverter is generally the component most likely to need attention over a system's lifetime, since it runs continuously and contains more active electronics than the panels themselves. Warning signs include an error code or blinking status light, a complete stop in production despite full sun, or unusual noise.
Do not open the inverter enclosure yourself. It contains high-voltage DC even when the AC side is disconnected. Note any error code shown on the display or app and call your installer or the manufacturer's support line with that code in hand — it usually speeds up diagnosis considerably.
Physical damage
After any significant storm, a visual check from the ground (binoculars are useful, not a ladder) for cracked glass, visibly loose panels, or damaged mounting hardware is reasonable. Anything beyond a visual check belongs to a professional — roof work always carries fall risk, and disturbed wiring on an energized system is a real hazard.
What you can reasonably check yourself
- Confirm the monitoring gateway has power and a working internet connection.
- Compare this month's production to the same month last year, not last month, to separate a real problem from normal seasonal variation.
- Do a visual ground-level check after storms.
- Note any error codes shown in the app before calling for service — it is the single most useful piece of information you can hand a technician.
What always needs a professional
- Anything requiring roof access.
- Any work on the inverter enclosure or DC wiring.
- Persistent output loss that survives a cleaning and is not explained by new shading.
- Any burning smell, visible scorching, or repeated breaker trips — treat these as urgent and stop using the affected circuit until inspected.
Frequently asked questions
How much does soiling really cost me? It varies by climate and rainfall frequency; the practical takeaway is that a gradual, uniform decline across all panels points to soiling, while a decline in one specific panel or string points to a component issue.
Is a slow decline over many years normal? Yes — all panels degrade gradually, which is exactly what the performance warranty is built to guarantee against beyond a stated threshold.
My app shows zero production but my lights still work — is that normal? Yes. Grid-tied homes draw from the utility automatically when solar production is low or zero; it does not mean anything else in the house is affected.
The bottom line
Check the monitoring app and compare against the same month last year before assuming something is broken — most "problems" are either a Wi-Fi gap or normal seasonal variation. When it is a real issue, isolating whether it is one panel, the inverter, or system-wide narrows the cause fast and gives your installer exactly what they need to diagnose it quickly.