Path-Q Solar
How can I distinguish normal panel degradation from premature failure?
Answer
Normal degradation is a gradual, broadly consistent decline over years, while premature failure is more likely when output drops suddenly, one panel or string diverges, alarms appear, or production falls beyond the system's documented expectations after accounting for weather and soiling. Confirm the trend with monitoring and comparable irradiance or weather data before making a warranty claim.
Key points
- Use the original production model, panel warranty terms, and early operating records as baselines.
- Compare similar panels, strings, or time periods rather than relying on one low-production day.
- Check for shading changes, soiling, inverter faults, communications gaps, and curtailment.
- A professional electrical or performance test may be needed to identify the failed component.
What it depends on
- Panel warranty and expected degradation specification
- Reliable production and weather records
- System architecture and monitoring granularity
- Shading, soiling, inverter, and grid conditions
Risks and trade-offs
- Weather variation can look like degradation in short-term data.
- A monitoring gap can be mistaken for equipment failure.
- Opening equipment or testing energized circuits can create safety and warranty risks.
Information you may need
- Installation date and panel specifications
- Production history and alarms
- System design, string layout, and maintenance records
- Weather and shading changes
Your next step
What to do next
Export a multi-month or multi-year production trend, compare it with the warranty baseline, and send the evidence to the installer or warranty provider.
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