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?Figure 1. PV energy production decrease dueto soiling.

?Dust continued to accumulate at asubstantial rate even after 234 days without cleaning.

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?Figure 2. PV soiling rate versus days sincelast cleaned

?The daily soiling rate after 6 months wasaround half that of when recently cleaned.

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?Figure 3. Test stands at Solar Test Facilityin Qatar.

Four cleaningschedules were tested: weekly, every 2 months, every 6 months, and neve

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