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NABCEP PVIP Exam Syllabus Topics:

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

Question 1

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

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

Question 2

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

Question 3

A PV module has a NOCT of 47°C. At 1000 W/m² and 35°C ambient, what is the cell temperature?

A. 59°C
B. 47°C
C. 63°C
D. 55°C

Question 4

A grid-connected PV system on a dwelling is producing 30% less power than expected. The conductors from threes strings of modules enter into a 3-pole fused dc disconnect, and each ungrounded conductor is connected to a separate pole. On the inverter side of the switch terminals, the three strings are combined. The dc disconnect switch is opened. The voltages on the array side of the switch are 440 on string #1, 444V on string #2, and 0V on string #3. The dc disconnect is then closed and the inverter resumes operating, still producing about 30% less power than expected. A clamp-on ammeter is used to measure the dc current of each string of each string of modules where they enter the rooftop junction box. The operating currents of each string are 3.9A for string #1, 3 85A for string #2, and 4.3 A for string #3. What is the MOST likely with the system?

A. String #3 has an open connection and is not contributing any voltage.
B. Positive and negative output conductors of string #3 are faulted together.
C. There is lower module mismatch in string #3 than in string #1 and #2.
D. A ground fault is causing the current from strings #1 and #2 to flow into string #3.

Question 5

A PV system uses 10 AWG USE-2 wire for a 150-foot source circuit run with an Isc of 8A. The terminals are rated at 75°C. What is the ampacity of the conductor after applying NEC temperature and conduit fill adjustments at 35°C?

A. 35A
B. 45A
C. 40A
D. 30A

Solutions: