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

1. A grid-tied PV system uses a transformerless inverter with a maximum DC input of 1000V. The array consists of 20 modules, each with a Voc of 45V. What is the NEC 690.7 correction factor for a low temperature of -15° C if the temperature coefficient is -0.30%/°C?

A) 1.18
B) 1.12
C) 1.15
D) 1.21

2. Per NEC 690.4, who is qualified to install a PV system?

A) Only a NABCEP-certified installer
B) A licensed electrician or supervised trainee
C) Anyone with basic electrical knowledge
D) A journeyman with PV experience

3. A PV system combiner box contains six source circuits, each with an Isc of 8A. The output conductor is 6 AWG THWN-2 copper rated at 90°C. What is the maximum allowable OCPD rating per NEC?

A) 60A
B) 50A
C) 80A
D) 70A

4. A 15 kW array has a PR of 0.88 and 1600 kWh/m²/year insolation. What is the annual output?

A) 19,800 kWh
B) 24,000 kWh
C) 21,120 kWh
D) 22,440 kWh

5. A project is using a PV module with a 25-38dc maximum power voltage range and a single input inverter with an operating windows of 250vdc-450dc. The dwelling the system is to be installed on has a 5:12 roof with a southeastem face that can accommodate 14 modules and southwestern face that can accommodate 10 modules. What is the MAXIMUM number of modules that can be installed for proper inverter maximum power point tracking?

A) 20
B) 14
C) 18
D) 24

Solutions: