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The DustIQ is never cleaned on its own. It is only cleaned when the actual PV modules are cleaned. Then it remains "in sync" with the real PV modules.
The DustIQ is made of PV module material like the glass and aluminium. Thus, the same procedures as for cleaning the PV modules can be used.
Remove all data when the weather station indicates rain (30 minutes before and 1 hr after) and when the dew point is close to or below the PV module temperature (dew). Or install a Modbus dew-rain sensor next to the DustIQ.
Probably not, but the PV plant owner might ask you to show that indeed the PV modules were cleaned (step change in soiling loss) and how good the robots do their job (how close to 0% loss you get)