What are the activities to be carried out under the routine inspection of an inverter?

Inverters that are offline can have a significant adverse financial impact on the entire project. Inverter failure rates are important to financial metrics such as Return on Investment (ROI). The following section details the activities that may be carried out under the routine inspection of an inverter.

  • The inverter must be switched off before performing any maintenance.
  • Check the inverter’s display screen, which is the primary indicator of a possible problem with the inverter. The inverter can detect and display inverter warnings and faults.

Fig-Inverter Display Screen
  • Visually check or inspect the inverter for external damage.
  • Check for loose or disconnected wires.
Fig-Disconnected wires from the inverter base
  • Do not expose inverters to direct sunlight. For outdoor installations, use existing shadow or roof over the inverters.
  • Check the tightness of cable terminals, conduits, insulation, overheating, and corrosion.
Fig- Loose inverter conduits and cables
  • Check to ensure that the inverter is well-ventilated i.e. that the exhaust fan is working properly.  Check if the inverter inlet and outlet fan are working properly. Vacuum or blow the inverter using an appropriate device. (By trained personnel only).
 Fig- Dust accumulated on the Inverter exhaust fan
  • Check for noise levels of the inverter through an audio check. If you notice that the inverter is producing a large humming sound, then contact the service provider.  Inspect, clean, or replace the filters (By trained personnel only).
  • Check for proper grounding levels of the inverter.

(Ref: Best Practices in Operation and Maintenance of Rooftop Solar PV Systems in India – GERMI)

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