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

1. An installer has decided to use 31 in. long. 3.1/2 in diameter conical ground screws as the footings for a 3.840 W solar electric system. Access to he is too difficult to pour concrete footings. The soll is classified as sandy loam. The design wind speed is 90 mph with an uplift force of 32 ibs/ft2. What is the MINIMUM number of screw required to resist uplift loads?

A) 12
B) 10
C) 14
D) 8

2. A system's performance ratio (PR) is calculated as 0.85. If the array capacity is 10 kW and PSH is 5, what is the daily AC output?

A) 45 kWh
B) 50 kWh
C) 42.5 kWh
D) 40 kWh

3. Which temperature coefficient is used in the calculation to verify energy production of a PV system?

A) OptionD
B) OptionC
C) OptionA
D) OptionB

4. During commissioning, a PV system's measured Voc is 10% lower than expected. What is the most likely cause?

A) High ambient temperature
B) Inverter malfunction
C) Open circuit in a string
D) Shading on one module

5. Thermal imaging infrared cameras can be used to help find which of the following system operational issues?

A) Blind spot fault in a source circuit
B) Loose PV input circuit terminations in a combiner box
C) Intensity of solar insolation to determine power output
D) Battery state of charge in a multimode system

Solutions: