Path-Q Solar
What monitoring trend could indicate that panel degradation is accelerating?
Answer
An accelerating degradation pattern is a sustained, year-over-year decline in weather-normalized production per installed capacity that becomes steeper over successive intervals, after accounting for soiling, shading, outages, curtailment, and equipment changes. A single low month is not enough to establish acceleration.
Key points
- Use comparable irradiance and temperature conditions rather than raw annual totals alone.
- Analyze the same array sections and account for inverter downtime and monitoring gaps.
- Compare trends with the manufacturer's expected degradation range and warranty criteria.
- Module-level divergence can indicate localized defects rather than uniform aging.
What it depends on
- Reliable historical monitoring
- Weather-normalization method
- Changes in shading, cleaning, equipment, and operating conditions
- Warranty terms and baseline production records
Risks and trade-offs
- Poor data quality can make normal weather variation look like degradation.
- A system-wide decline may be caused by inverter, wiring, or monitoring failure.
- Waiting for certainty can reduce evidence available for a warranty claim.
Information you may need
- Multi-year production and irradiance data
- Outage, maintenance, and cleaning records
- System changes and shading history
- Warranty thresholds and claim procedures
Your next step
What to do next
Create a weather-normalized trend by year and array section, then request an independent diagnostic before making a degradation or warranty claim.
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