NABCEP NABCEP PV Commissioning and Maintenance Specialist

Question 1

What is the primary purpose of a commissioning inspection for a newly installed PV system?

Accepted Answer

To verify the system operates safely and as designed before handover

Answer

To determine the system's aesthetic appearance

Answer

To calculate the system's payback period

Answer

To register the system with the utility

Question 2

During a PV system commissioning, what is the correct sequence for energizing the system?

Accepted Answer

DC side first, then AC side

Answer

AC side first, then DC side

Answer

Both sides simultaneously

Answer

It does not matter which side is energized first

Question 3

Which tool is essential for verifying PV string open-circuit voltage during commissioning?

Accepted Answer

Digital multimeter

Answer

Clamp meter

Answer

Power analyzer

Answer

Pyranometer

Question 4

What does an insulation resistance test (megohm test) during commissioning detect?

Accepted Answer

Ground faults or damaged insulation in wiring

Answer

Inverter efficiency

Answer

Module power output degradation

Answer

Battery state of charge

Question 5

A PV system's string current reads significantly lower than expected during commissioning. What is the most likely cause?

Accepted Answer

A shaded or failed module in the string

Answer

High ambient temperature

Answer

Inverter over-frequency trip

Answer

Utility voltage fluctuation

Question 6

Which document should a commissioning technician provide to the system owner at project closeout?

Accepted Answer

As-built drawings, system manual, and commissioning report

Answer

Manufacturer's raw component cost list

Answer

Utility interconnection application only

Answer

Permit application forms