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

1. With all other environmental parameters being the same, which would be the expected reduction in KM performance of a PV system after an irradiance drop from 810w/m2 to 740w/m2?

A) 7.4%
B) 10.2%
C) 8.6%
D) 9.5%

2. A AWG THWN-2 PV output conductors from two PV arrays are run in the same 3 in, conduit to their respective functionally grounded inverters in the building. The three PV source circuits are each protected by a 15A fuse in the combiner box at the array. The conduit, which is strapped directly to the roof, is exposed to design temperatures of 140' F (60' C) during its 30 ft.
Exposed run. What is the MAXIMUM current carrying capability value of the PV output conductors?

A) 34A
B) 54A
C) 42A
D) 61A

3. A site has a known magnetic declination of 14 west. What should the corrected azimuth reading of the array be in order to be facing true south?

A) 194
B) 166
C) 180
D) 270

4. A system's inverter efficiency drops from 97% to 94% due to aging. What is the percentage increase in energy loss?

A) 4.5%
B) 3.2%
C) 2.1%
D) 6.0%

5. 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) 21,024 kWh
C) 15,768 kWh
D) 12,264 kWh

Solutions: