NABCEP NABCEP PV Commissioning and Maintenance Specialist 2

Question 1

What maintenance task should be performed on PV module surfaces in dusty or arid climates more frequently than in other regions?

Accepted Answer

Cleaning to remove soiling

Answer

Recabling

Answer

Replacing bypass diodes

Answer

Updating monitoring firmware

Question 2

During annual PV system maintenance, which component's connections should be inspected for corrosion and re-torqued to specification?

Accepted Answer

All DC and AC electrical connections

Answer

Module glass surfaces

Answer

Inverter LCD display

Answer

Monitoring web portal credentials

Question 3

What is the recommended method for detecting hot spots in PV modules during a maintenance inspection?

Accepted Answer

Infrared (IR) thermography

Answer

Visual inspection only

Answer

Clamp meter readings

Answer

Acoustic testing

Question 4

A combiner box fuse blows repeatedly in the same string position. What is the most appropriate next step?

Accepted Answer

Inspect the string for a ground fault or short circuit

Answer

Replace with a higher-rated fuse

Answer

Bypass the fuse position

Answer

Increase the inverter's MPPT voltage range

Question 5

Which performance metric is most useful for comparing a PV system's actual output to its expected output over time?

Accepted Answer

Performance ratio (PR)

Answer

Peak watt rating

Answer

Open-circuit voltage

Answer

Nominal operating cell temperature (NOCT)

Question 6

What is the primary hazard when performing maintenance on a PV array that cannot be fully de-energized by shutting off the inverter?

Accepted Answer

PV modules continue to produce DC voltage in daylight even with the inverter off

Answer

Low voltage shock risk from AC circuits

Answer

Module glass cracking from thermal stress

Answer

Loss of monitoring data