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

1. 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) 24.24 in.
B) 12.73 in.
C) 40.50 in.
D) 18.25 in.

2. A 10 kW array produces 14,000 kWh annually. What is the specific yield in kWh/kW?

A) 1200
B) 1800
C) 1600
D) 1400

3. Insulation resistance testing is being performed on the conductors of a 3-year-old PV system. With a constant high test voltage being applied to a dc conductor, the test results in a high resistance reading. Which does this finding indicate?

A) Wiring insulation has degraded and is resulting in leakage.
B) Typical module degradation has lowered the output of the system's strings.
C) The conductor insulation is functioning as intended.
D) Soling of modules has reduced the efficiency of the system.

4. A 7KW/ 14 KWh multimode system has been installed at a residence, ac-couple with the customer's existing
6.7kwh ac PV system. The system providers uninterrupted power to a protect loads subpanel, which is connected to a refrigerator, Microwave, 1.0 ton are conditioner, three lightning circuit, and the 6.7kwac PV system. One month later, the homeowner moves additional circuits to the protected loads subpanel, substantially increasing the loads. Why would this cause, the backfed interconnection breaker in the main service panel to trip?

A) The load «the protected loads subpanel exceeds the PV system ac rating by 25%.
B) The total load exceeds the system's energy storage capacity of 14kWh.
C) The toad exceeds the capacity of the interconnection breaker.
D) The main service panel is no longer compliant with NCC 705.12.

5. A PV system designer is selecting an inverter for a 12 kW array with a maximum power point voltage range of 300-450V DC. Which inverter specification is most critical to verify compatibility?

A) Nominal AC output voltage
B) Inverter efficiency rating
C) DC input voltage operating range
D) Maximum AC output current

Solutions: