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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.
?Figure 2. PV soiling rate versus days sincelast cleaned
?The daily soiling rate after 6 months wasaround half that of when recently cleaned.
?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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