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NABCEP PVIP Exam Syllabus Topics:

NABCEP PV Installation Professional (PVIP) Board Certification Sample Questions:

Question 1

Which of the following tests measures axial uplift when performing load testing of driven-pile foundation members

A. Resistance to withdraw (pull-out) force
B. Resistance to twisting
C. Resistance to horizontal movement
D. Resistance to downward (Sinking force

Question 2

A site survey indicates a residential roof with a 4:12 pitch facing 20° east of south. The local latitude is 35°N, and the optimal tilt for maximum annual production is equal to latitude. What adjustment should be made to compensate for the roof's orientation and tilt to achieve near-optimal output?

A. Rotate modules 20° west to face true south
B. No adjustment needed; output loss is negligible
C. Install adjustable racking to match 35° tilt
D. Increase array capacity by 5%

Question 3

With all other environmental parameters being the same, which would be the expected reduction in KM performance of a PV system after an irradiance drop from 810w/m2 to 740w/m2?

A. 7.4%
B. 8.6%
C. 9.5%
D. 10.2%

Question 4

A PV connection is being made at the center of a 300 ft. long 200 feeder. See the attack diagram. The feeder originates in the upper third of the 800A main service panel (800A main breaker) with a 200A breaker and terminates in a 200A main-lug-only subpanel. The rated output of the PV system inverter is 100A.

Which are the NIMUMUM actions required to achieve an NEC-compliant installation?

A. Install a 325A breaker at the PV source connection point on the portion of the feeder toward the subpanel. Increase the capacity of the feeder from the main panel board to 325A breaker to the bottom of the main service panel, away from the 800 main breaker.
B. Install a 325A at the PV source connection point on the portion of the feeder toward the subpanel, increase the capacity of this portion of the feeder to 325A, add a 200A main breaker to the subpanel, and move the 200A breaker to bottom of the main service panel, away from the 800A main breaker.
C. Install a 200A breaker at the PV source connection point on the portion on the portion of the feeder toward the subpanel and move the 200A breaker to the top of the main service panel, adjust to the 800A main breaker.
D. Install a 200A breaker at the PV source connection point on the portion of the feeder toward the subpanel, maintain the capacity of the entire feeder, and move the 200A breaker to the bottom of the main service panel, away from the 800A main breaker.

Question 5

A grid-connected PV system on a dwelling is producing 30% less power than expected. The conductors from threes strings of modules enter into a 3-pole fused dc disconnect, and each ungrounded conductor is connected to a separate pole. On the inverter side of the switch terminals, the three strings are combined. The dc disconnect switch is opened. The voltages on the array side of the switch are 440 on string #1, 444V on string #2, and 0V on string #3. The dc disconnect is then closed and the inverter resumes operating, still producing about 30% less power than expected. A clamp-on ammeter is used to measure the dc current of each string of each string of modules where they enter the rooftop junction box. The operating currents of each string are 3.9A for string #1, 3 85A for string #2, and 4.3 A for string #3. What is the MOST likely with the system?

A. A ground fault is causing the current from strings #1 and #2 to flow into string #3.
B. String #3 has an open connection and is not contributing any voltage.
C. There is lower module mismatch in string #3 than in string #1 and #2.
D. Positive and negative output conductors of string #3 are faulted together.

Solutions: