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

1. 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 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.
C) 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.
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.

2. A 10 kW PV system produces 8 kW AC under STC. After one year, output drops to 7.2 kW. What is the most likely maintenance issue?

A) Loose connections
B) Module degradation
C) Soiling on modules
D) Inverter inefficiency

3. A system's annual output decreases by 10% due to shading. The original output was 20,000 kWh. What is the new output?

A) 20,000 kWh
B) 19,000 kWh
C) 18,000 kWh
D) 16,000 kWh

4. A grid-interactive PV system with battery backup is being installed with a ground-mounted PV array located
200 ft, from the inverter and batteries. The dc PV output circuit has overcuit has overcurrent protection rated from 30A. To reduce voltage drop between the array and batteries, the output circuit wire size was determined to be 6 AWG. The fused dc disconnect between the inverted and batteries is rated for 300A. What is the required size of the equipment grounding conductor between the metal battery case and the inverter?

A) 10 AWG
B) 4 AWG
C) 6 AWG
D) 8 AWG

5. Aerial lifts used to hoist equipment and PV modules to roof levels may be field modified for uses other than those intended by the manufacturer with which approval or certification?

A) Tested and approval by the distributor of the equipment
B) Certified in writing by the manufacturer or an NRTL
C) Certified via the state material handling safely statutes
D) Approval by the local AHJ for meeting safely regulations

Solutions: