Path-Q Solar
What production pattern could indicate uneven degradation across one section of an array?
Answer
A persistent, weather-adjusted decline in one array section relative to otherwise comparable sections can indicate uneven degradation, especially when the gap grows over time and follows the same modules or electrical grouping. The pattern should be confirmed after ruling out shading, soiling, wiring, mismatch, and monitoring errors.
Key points
- Compare sections by the same time intervals, sunlight conditions, orientation, and operating availability.
- Look for a recurring lower normalized output rather than an isolated dip.
- A step change may suggest a fault or configuration change rather than gradual degradation.
What it depends on
- Whether section-level monitoring is available
- Common orientation, tilt, shading, and weather exposure
- String or microinverter configuration
- Quality and continuity of historical data
Risks and trade-offs
- Over-attributing a section difference to degradation can lead to unnecessary module replacement.
- Different roof planes may have legitimately different production profiles.
Information you may need
- Section-level or inverter-level production history
- Array layout and electrical grouping
- Shading, cleaning, repair, and equipment-change history
- Weather and irradiance context if available
Your next step
What to do next
Ask the installer or service provider to compare normalized section output over time and test the affected strings or modules.
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SQ02330