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Most solar plant operators running soiling sensors have noticed it at some point — the sensor reports 0.8%, but the performance ratio tells a different story. The instinct is usually to blame the sensor, schedule a calibration visit, and move on. But the gap rarely closes, and the uncertainty quietly accumulates in every report that goes to your asset owner or lender. The issue is not the equipment. It is that these two instruments were never measuring the same thing to begin with — and knowing why is more useful than replacing either one.


