Why soiling loss quietly peaks in the weeks before the monsoon

Across most of India, the steepest soiling losses don’t arrive with the dust storms everyone notices. They accumulate quietly through the dry pre-monsoon weeks, when there’s no rain to rinse the glass and airborne dust is at its highest.

By the time the first monsoon showers arrive, many arrays are running 15 to 25% below their clean baseline. Rain helps, but it also dries into mineral spots that a hose alone won’t lift.

A proper clean in this window is the single highest-ROI maintenance action of the year: it recovers peak-season generation exactly when tariffs and irradiance are highest.

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