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

1. A module's Voc is 40V at STC. At -5°C with a coefficient of -0.33%/°C, what is the Voc?

A) 42.0V
B) 43.0V
C) 44.0V
D) 45.0V

2. When commissioning a PV system, which test is most critical to verify proper operation of the array before connecting to the inverter?

A) Open-circuit voltage test
B) Short-circuit current test
C) Insulation resistance test
D) Ground-fault detection test

3. A 1. 100 ft, 2 ranch home with cathedral callings has a 14 ft. x 41 ft. 8 in , south-facing , composite shingle roof. An engineer has determined that the home's 2 in, x 6 in. on-center roof rafters are strong enough to gold a solar electric system. The system will have 62.25 in. x 32.50 in. modules with a 1-in gap between modules and a standard twin-rill mounting system number of modules that can fit on the roof on under these conditions?

A) 30 modules in portrait
B) 40 modules in landscape
C) 28 modules in portrait
D) 35 modules in landscape

4. A PV system installation utilizes micro inverters connected to each module of the array. Each micro inverter has a nominal rated output of 250WV. Single phase. The microinverters are listed so that multiple inverters may be connected in parallel to a single feeder circuit, and each inverter has an cable and connector rated for
30A. What is the MAXIMUM number of inverters that may be wired together on a single 30A feeder circuit?

A) 17
B) 15
C) 23
D) 28

5. An installer is sizing conductors for a 200-foot PV source circuit with a current of 8A at 400V DC. The design specifies a 1.5% voltage drop using copper wire at 30°C. What is the minimum wire size required?

A) 12 AWG
B) 10 AWG
C) 6 AWG
D) 8 AWG

Solutions: