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NABCEP PVIP Exam Syllabus Topics:

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

1. A homeowner is concerned that a 6kWdc PV system might be experiencing a performance issue. The homeowner has noticed what appears to be declining production. The installer analyzes the following data acquisition system (DAS) results for each year since the installation:

Given the data, which is the MOST likely conclusion to draw?

A) There is an intermittent inverter failure that is causing production to be lower than expected and the inverter should be repaired.
B) There is a problem with the DAS because the peak sun hours do not correlate with production values and the das should be repaired.
C) The system has experienced above-average degradation and a module warranty claim should be explored.
D) A combination of normal module degradation combined with cloudy weather has caused lower output in the past few years.

2. A rooftop PV array uses a ballasted racking system with a total weight of 4 psf. The roof's maximum allowable load is 20 psf, including a snow load of 15 psf. Is this installation permissible?

A) Yes, if snow load is mitigated
B) Yes, with no restrictions
C) No, requires structural reinforcement
D) No, exceeds total load

3. What is the maximum allowable voltage drop for a PV source circuit conductor run of 100 feet, using 10 AWG copper wire, if the system operates at 48V DC and the design specifies a 2% voltage drop?

A) 0.48V
B) 0.96V
C) 1.92V
D) 1.44V

4. A system's inverter output is 9 kW at 900 W/m² irradiance. What is the expected output at 1000 W/m²?

A) 10.0 kW
B) 9.5 kW
C) 10.5 kW
D) 11.0 kW

5. A PV array's tilt is 30° at a latitude of 40°N. What is the winter energy loss compared to optimal tilt?

A) 5-10%
B) 10-15%
C) 20-25%
D) 15-20%

Solutions: