Free NABCEP PV Installation Professional Questions and Answers

Question 1

What is the primary purpose of an inverter in a PV system?

Accepted Answer

To convert DC electricity generated by the PV panels to AC electricity used by home appliances

Answer

To store solar energy

Answer

To protect the system from lightning strikes

Answer

To track the sun’s position

Question 2

During the installation of a PV system, what is the purpose of grounding the PV array?

Accepted Answer

To prevent electrical shock and protect against lightning

Answer

To improve energy efficiency

Answer

To enhance the performance of the PV modules

Answer

To reduce the cost of installation

Question 3

What is the correct angle to install PV modules to optimize energy production in a fixed-tilt system?

Accepted Answer

The latitude of the installation site

Answer

The same as the roof slope

Answer

90 degrees to the ground

Answer

Parallel to the equator

Question 4

What is the main purpose of a combiner box in a PV system?

Accepted Answer

To combine multiple string outputs into a single output

Answer

To convert DC to AC

Answer

To monitor energy production

Answer

To store excess energy

Question 5

Why is it important to perform an insulation resistance test on PV modules during installation?

Accepted Answer

To check for proper electrical insulation and detect potential faults

Answer

To verify the mechanical strength of the modules

Answer

To ensure the modules are aligned correctly

Answer

To test the aesthetic quality of the installation

Question 6

What is the function of a maximum power point tracker (MPPT) in a PV system?

Accepted Answer

To store energy for nighttime use

Answer

To track the movement of the sun

Answer

To ensure the PV system operates at its maximum power output

Answer

To regulate the temperature of the PV modules

Question 7

When installing PV modules on a roof, what safety measure is critical to protect the workers?

Accepted Answer

Using fall protection equipment, such as harnesses and guardrails

Answer

Installing modules during night time

Answer

Wearing light clothing

Answer

Ensuring modules are aesthetically aligned