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

1. In the middle of a winter day, the data acquisition system for a ground-mounted PV system with large central inverters sends an email alert that system performance is at 50% based on irradiance and temperature performance calculations. No inverters are completely offline. The closed technician is a 4-hour drive from the site, and there are no cameras on site. Which is the BEST response to this situation?

A) Call the data acquisition company to report a monitoring system failure.
B) Review power output and weather conditions via the monitoring portal, and review local weather reports.
C) Report the low performance to the inverter manufacturer and request that a technical be sent to the site for a warranty claim.
D) Dispatch the technician to the site t investigate the low performance issue in person.

2. 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) 24
B) 20
C) 14
D) 18

3. While surveying a potential three-phase project, an installer measures the voltage at the point of utility interconnection. The results are as follows:
* Phase to phase: 240V
* Phase A neutral: 120V
* Phase B neutral: 208V
* Phase C neutral: 120V
Which is a likely cause of these reading?

A) High-leg transformer configuration
B) Missing ground in the transformer
C) Supply-side ground fault
D) Phase-to-phase power imbalances

4. Most electric service providers require interactive PV equipment to comply with which for interconnection to their distribution grid?

A) UL 1741
B) UL 16998
C) UL 2703
D) UL 60947-1

5. A PV array with 58 in. X 38 in modules in portrait orientation is to be mounted at a 35 tiit angle on a shingle roof that has a 5:12 pitch. Assuming the support leg is attached to the top of the modules and is perpendicular to its face, what is the length of the support leg for the modules?

A) 12.73 in.
B) 18.25 in.
C) 24.24 in.
D) 40.50 in.

Solutions: