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

1. A 10 kW PV system produces 8 kW AC under STC. After one year, output drops to 7.2 kW. What is the most likely maintenance issue?

A) Module degradation
B) Inverter inefficiency
C) Loose connections
D) Soiling on modules

2. Which of the following requires a UL listing or its equivalent?

A) Lag screws
B) Grounding electrode clamp
C) System manuals
D) System labels and markings

3. On a PV system larger than 100kw, which PV array design will provide the HIGHEST degree of performance monitoring.
Granularity, and ease of troubleshooting performance issues?

A) Multiple-string inverter system with data acquisition system located at each dc combiner
B) Multiple-string inverter system with data acquisition system located at each inverter.
C) Central inverter with data acquisition system located at the inverter.
D) Multiple-string inverter system with monitored dc-to-dc converters located at each module

4. A PV array is installed near a pool. What is the minimum distance required from the water's edge per NEC
690.31?

A) 15 feet
B) 5 feet
C) 20 feet
D) 10 feet

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

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

Solutions: