Solar Fault Atlas

Probable causes explained through observable evidence.

ArraySignal uses deterministic rules, physics, time-series analysis, and explicit exclusions. A probable classification is not presented as a confirmed field diagnosis.

Outage

Signal: Near-zero actual production during eligible daylight while expected production is material.
Guardrail: Nighttime zeros and periods without trustworthy expected production.
Recommended investigation: Check site availability, protection, meter status, and upstream communications.

Persistent underperformance

Signal: Actual production remains materially below weather-adjusted expected production across a sustained eligible period.
Guardrail: Short noise, invalid measurements, established clipping, and communications gaps.
Recommended investigation: Compare inverter-relative performance, irradiance inputs, and recent maintenance history.

Clipping

Signal: Production repeatedly plateaus near the configured AC limit during high expected generation.
Guardrail: Clipping is normal system behavior and is not automatically classified as failure.
Recommended investigation: Confirm design DC/AC ratio and determine whether behavior matches the operating model.

Possible soiling

Signal: A gradual, persistent daytime performance decline is consistent with accumulation loss.
Guardrail: This remains a probable classification unless inspection or cleaning-response evidence confirms it.
Recommended investigation: Inspect representative modules and compare performance before and after cleaning.

Communications/data fault

Signal: Missing intervals, frozen values, duplicate timestamps, invalid measurements, or implausible discontinuities.
Guardrail: Missing telemetry is not converted into production loss without explicit uncertainty.
Recommended investigation: Verify logger connectivity, source exports, clocks, mappings, and sensor health.

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