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

1. A bifacial PV module has a rated power of 350W on the front side and a bifaciality factor of 70%. If the rear side receives 200 W/m² of irradiance, what is the total power output under STC front-side conditions (1000 W
/m²)?

A) 385W
B) 490W
C) 449W
D) 420W

2. An installer was asked to provide a means to measure the voltage of each battery in a system. The bank is located 50 ft.
From the data logger. The installer will be using shielded. Twisted pairs of instrumentation wiring, all run in the bundle a conduct.
The signals are connected to isolated and ungrounded inputs at a data logger. Which safely precaution is MOST needed to protect the instrumentation wiring?

A) Each set of twisted pairs must be provided with properly rated fuses that are physically located at the battery.
B) The instrument wiring must be large (larger than # 18 AWG) to handle current from each battery and must be a double- insulated type.
C) Individual nonfused disconnects are required for each set of wiring because all of the signals must be isolated from each other.
D) An appropriately rated and sized of resistive elements for each twisted pair be located at, or very near to, the data logger terminals

3. A module's power drops by 0.5%/year. After 10 years, what is the output if the original power is 320W?

A) 316W
B) 304W
C) 288W
D) 310W

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.

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

Solutions: