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

1. A PV system has a 1000V DC array feeding a transformerless inverter. What is the minimum insulation rating for the DC conductors per NEC 690.35?

A) 2000V
B) 1000V
C) 1500V
D) 600V

2. A PV array's tilt is 15° at a latitude of 35°N. What is the annual energy loss compared to optimal tilt?

A) 1-2%
B) 3-5%
C) 6-8%
D) 10-12%

3. According to the 2020 National Electrical Code (NEC), what is the minimum required working clearance in front of a 1000V DC PV inverter installed in a non-dwelling unit?

A) 48 inches wide, 48 inches deep
B) 36 inches wide, 36 inches deep
C) 36 inches wide, 48 inches deep
D) 30 inches wide, 36 inches deep

4. 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) 28 modules in portrait
B) 35 modules in landscape
C) 30 modules in portrait
D) 40 modules in landscape

5. A PV system includes a 15 kW array with a maximum power point voltage of 450V and current of 33.33A.
The inverter efficiency is 97%, and the AC output voltage is 240V. What is the AC output current under STC?

A) 60.6A
B) 62.5A
C) 64.8A
D) 58.5A

Solutions: