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

1. Per NEC 690.8, a PV source circuit has an Isc of 9.5A. What is the minimum ampacity required for the conductor?

A) 15.0A
B) 14.25A
C) 9.5A
D) 11.875A

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

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

3. Which load path connections need to be analyzed when determining live and dead loads on a PV array system installed directly to a metal seam roof?

A) Rail to metal seam roof, metal seam roof to top plate, top plate to wall system
B) Module to rail to metal seam roof, metal seam roof sheathing/rather system.
C) Module to rail to metal seam roof, metal seam roof to top plate system
D) Module to rail, rail to roof sheathing, roof sheathing to wall, wall to base plate/foundation system

4. A system's specific yield is 1500 kWh/kW. If the array is 8 kW, what is the annual output?

A) 14,000 kWh
B) 10,000 kWh
C) 16,000 kWh
D) 12,000 kWh

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) String #3 has an open connection and is not contributing any voltage.
B) A ground fault is causing the current from strings #1 and #2 to flow into string #3.
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: