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

1. An installer has decided to use 31 in. long. 3.1/2 in diameter conical ground screws as the footings for a 3.840 W solar electric system. Access to he is too difficult to pour concrete footings. The soll is classified as sandy loam. The design wind speed is 90 mph with an uplift force of 32 ibs/ft2. What is the MINIMUM number of screw required to resist uplift loads?

A) 8
B) 14
C) 12
D) 10

2. An installer troubleshooting a ground-mounted array finds It to be performing as expected most of the time, but a ground-fault error is indicated on hot days. The inverter is in a shaded location. Which of the following should the installer check for FIRST when troubleshooting this array?

A) Loose module connections
B) High voltage
C) Pinched module wiring
D) Intermittent ground connections

3. A 20 kW array has a measured output of 16 kW at 800 W/m² irradiance. What is the performance loss due to irradiance?

A) 25%
B) 20%
C) 30%
D) 10%

4. A PV array is installed at a site with an annual average temperature of 25°C and a maximum recorded temperature of 45°C. The module Voc is 50V at STC, with a temperature coefficient of -0.32%/°C. What is the maximum string voltage at the coldest expected temperature of -10°C?

A) 600V
B) 580V
C) 540V
D) 560V

5. A system's annual output decreases by 10% due to shading. The original output was 20,000 kWh. What is the new output?

A) 20,000 kWh
B) 19,000 kWh
C) 16,000 kWh
D) 18,000 kWh

Solutions: