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

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

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

2. A PV system's capacity factor is 18%. The array is 10 kW, and it operates 365 days/year. What is the annual energy output?

A) 18,000 kWh
B) 12,264 kWh
C) 21,024 kWh
D) 15,768 kWh

3. A module's power drops by 0.5%/year. After 10 years, what is the output if the original power is 320W?

A) 304W
B) 310W
C) 316W
D) 288W

4. 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) 8
B) 12
C) 14
D) 10

5. A site survey indicates a residential roof with a 4:12 pitch facing 20° east of south. The local latitude is 35°N, and the optimal tilt for maximum annual production is equal to latitude. What adjustment should be made to compensate for the roof's orientation and tilt to achieve near-optimal output?

A) Increase array capacity by 5%
B) Install adjustable racking to match 35° tilt
C) Rotate modules 20° west to face true south
D) No adjustment needed; output loss is negligible

Solutions: