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NABCEP PVIP Exam Syllabus Topics:

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

1. A bifacial PV module has a rated power of 350W on the front side and a bifaciality factor of 70%. If the rear side receives 200 W/m² of irradiance, what is the total power output under STC front-side conditions (1000 W
/m²)?

A) 420W
B) 490W
C) 385W
D) 449W

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) Inverter inefficiency
C) Soiling on modules
D) Module degradation

3. A grid-tied PV system uses a transformerless inverter with a maximum DC input of 1000V. The array consists of 20 modules, each with a Voc of 45V. What is the NEC 690.7 correction factor for a low temperature of -15° C if the temperature coefficient is -0.30%/°C?

A) 1.21
B) 1.15
C) 1.18
D) 1.12

4. A PV array is tested with an IV curve tracer. The fill factor is 0.70, lower than the expected 0.80. What does this indicate?

A) Short-circuit current rise
B) Open-circuit voltage drop
C) Shunt resistance decrease
D) Series resistance increase

5. A 5 kW system has a daily output of 20 kWh at 5 PSH. What is the total derate factor?

A) 0.80
B) 0.75
C) 0.85
D) 0.90

Solutions: