Production looks low after a dusty stretch. Everyone blames dirt. Sometimes dirt is wrong — and a dead string (or inverter issue) sat underneath.
Short answer
Monitoring compares expected vs actual production so step-drops get investigated. If panels are obviously caked, cleaning helps. If the drop is sudden, uneven, or persists after cleaning, monitoring + inspection matter more.
What this post is not
Not an inverter repair manual. East Valley (Mesa / Gilbert / Chandler / Queen Creek).
When dust is the wrong diagnosis
Soiling usually shows as a gradual slide after haboobs, construction dust, or a long stretch without rain. A step drop — production falling in a cliff instead of a slope — is a different pattern. After a cleaning, if the cliff remains, monitoring history and a physical inspection beat another rinse.
Cleaning first vs monitoring first
If panels are visibly caked after a haboob or construction dust, cleaning is the obvious first move. If production history already shows a cliff — or cleaning does not restore the expected curve — shift to monitoring review and inspection. Dust and equipment faults can coexist; the sequence matters.
East Valley
This note is for Mesa, Gilbert, Chandler, Queen Creek, and related East Valley roofs.