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

1. Most electric service providers require interactive PV equipment to comply with which for interconnection to their distribution grid?

A) UL 16998
B) UL 1741
C) UL 2703
D) UL 60947-1

2. A 15 kW system has a total derate factor of 0.87. After 3 years at 1% degradation/year, what is the output?

A) 12.6 kW
B) 13.2 kW
C) 13.0 kW
D) 12.8 kW

3. A microinverter system uses 30 modules, each rated at 320W, with an inverter efficiency of 96%. The AC output is connected to a 208V three-phase service. What is the total three-phase power output?

A) 8.8 kW
B) 10.0 kW
C) 9.2 kW
D) 9.6 kW

4. 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) Positive and negative output conductors of string #3 are faulted together.
D) There is lower module mismatch in string #3 than in string #1 and #2.

5. A PV system combiner box contains six source circuits, each with an Isc of 8A. The output conductor is 6 AWG THWN-2 copper rated at 90°C. What is the maximum allowable OCPD rating per NEC?

A) 70A
B) 60A
C) 50A
D) 80A

Solutions: