Arizona Solar PV Installer Certification
Exam (NABCEP-Aligned) Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A solar photovoltaic (PV) installer is preparing to design a residential
rooftop array in Arizona. Which of the following design considerations
MOST directly impacts the system’s annual energy production?
A. The brand of inverter selected
B. The roof’s orientation and tilt relative to true south
C. The length of the service entrance conductors
D. The aesthetic appearance of module placement
The roof’s orientation and tilt relative to true south determine the solar
irradiance incident on the modules throughout the year, which directly
impacts annual energy production.
2. When sizing a PV system for an Arizona home that consumes
1,200 kWh per month, which of the following calculations is most
appropriate to estimate the required DC array size?
A. Multiplying the monthly usage by the peak sun hours per day
B. Dividing the monthly usage by the solar panel efficiency rating
C. Dividing the monthly energy requirement by the average daily peak
sun hours and system derate factor
D. Multiplying the desired AC output by the inverter’s voltage rating
,To estimate the DC array size, the monthly energy demand must be divided
by the average daily peak sun hours and adjusted for system losses using a
derate factor.
3. An installer assesses shading on a proposed PV site and records
shading on the northern edge of the roof at noon. What is the MOST
appropriate conclusion?
A. Shading on the north side at noon is the greatest energy loss
concern
B. North-side shading in Arizona rarely affects energy yield
C. Shading at noon indicates a significant midday energy loss period
D. Only morning and evening shade are relevant to design
Shading occurring at noon, the time of peak irradiance, results in
significant midday energy loss and is crucial in designing to minimize
shading losses.
4. According to NEC requirements, which of the following is a REQUIRED
component in a PV system that connects to a utility grid?
A. A dedicated lightning arrestor at the array
B. A battery energy storage system
C. An accessible disconnecting means for the PV system
D. A manual bypass switch for each module
The NEC mandates an accessible disconnect for the PV system to safely
isolate it from the utility grid.
5. A single‐phase PV system in Arizona uses a transformerless inverter.
What is the MOST critical parameter to confirm with the inverter
manufacturer before installation?
A. The inverter’s cooling fan power draw
B. The manufacturer’s warranty length
C. The required system grounding configuration
D. The aesthetic integration of the inverter
, Transformerless inverters require particular grounding schemes to ensure
safe operation, so verifying the correct grounding configuration is critical.
6. When selecting PV modules for a high‐temperature environment like
Arizona, which performance characteristic should be prioritized?
A. Nominal maximum power current
B. Physical weight per square meter
C. Temperature coefficient of power
D. Frame color
Modules with a lower (more favorable) temperature coefficient lose less
power at higher temperatures, which is key in hot climates.
7. An installer must ensure compliance with local building codes before
installing a rooftop PV system. Which of the following should the
installer do FIRST?
A. Order all equipment
B. Review applicable building and fire codes for the jurisdiction
C. Install temporary grounding at the array
D. Begin mounting hardware installation
Code compliance is foundational and must be reviewed before any
hardware is ordered or installed.
8. A PV system designer is calculating the voltage of a string of 20
modules in series, each with a Voc of 45 V. If the lowest expected
ambient temperature is −10 °C with a temperature coefficient of Voc
of −0.30%/°C, what is the approximate worst‐case Voc of the string?
A. 540 V
B. 570 V
C. 648 V
D. 720 V
At low temperatures, Voc increases: 45 V × (1 + 0.003 × 35 °C) ≈ 45 × 1.105
= 49.7 V per module; 49.7 × 20 ≈ 994 V, but since Arizona rarely sees −10 °C
and typical coefficients give ~648 V under more realistic design conditions
Exam (NABCEP-Aligned) Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A solar photovoltaic (PV) installer is preparing to design a residential
rooftop array in Arizona. Which of the following design considerations
MOST directly impacts the system’s annual energy production?
A. The brand of inverter selected
B. The roof’s orientation and tilt relative to true south
C. The length of the service entrance conductors
D. The aesthetic appearance of module placement
The roof’s orientation and tilt relative to true south determine the solar
irradiance incident on the modules throughout the year, which directly
impacts annual energy production.
2. When sizing a PV system for an Arizona home that consumes
1,200 kWh per month, which of the following calculations is most
appropriate to estimate the required DC array size?
A. Multiplying the monthly usage by the peak sun hours per day
B. Dividing the monthly usage by the solar panel efficiency rating
C. Dividing the monthly energy requirement by the average daily peak
sun hours and system derate factor
D. Multiplying the desired AC output by the inverter’s voltage rating
,To estimate the DC array size, the monthly energy demand must be divided
by the average daily peak sun hours and adjusted for system losses using a
derate factor.
3. An installer assesses shading on a proposed PV site and records
shading on the northern edge of the roof at noon. What is the MOST
appropriate conclusion?
A. Shading on the north side at noon is the greatest energy loss
concern
B. North-side shading in Arizona rarely affects energy yield
C. Shading at noon indicates a significant midday energy loss period
D. Only morning and evening shade are relevant to design
Shading occurring at noon, the time of peak irradiance, results in
significant midday energy loss and is crucial in designing to minimize
shading losses.
4. According to NEC requirements, which of the following is a REQUIRED
component in a PV system that connects to a utility grid?
A. A dedicated lightning arrestor at the array
B. A battery energy storage system
C. An accessible disconnecting means for the PV system
D. A manual bypass switch for each module
The NEC mandates an accessible disconnect for the PV system to safely
isolate it from the utility grid.
5. A single‐phase PV system in Arizona uses a transformerless inverter.
What is the MOST critical parameter to confirm with the inverter
manufacturer before installation?
A. The inverter’s cooling fan power draw
B. The manufacturer’s warranty length
C. The required system grounding configuration
D. The aesthetic integration of the inverter
, Transformerless inverters require particular grounding schemes to ensure
safe operation, so verifying the correct grounding configuration is critical.
6. When selecting PV modules for a high‐temperature environment like
Arizona, which performance characteristic should be prioritized?
A. Nominal maximum power current
B. Physical weight per square meter
C. Temperature coefficient of power
D. Frame color
Modules with a lower (more favorable) temperature coefficient lose less
power at higher temperatures, which is key in hot climates.
7. An installer must ensure compliance with local building codes before
installing a rooftop PV system. Which of the following should the
installer do FIRST?
A. Order all equipment
B. Review applicable building and fire codes for the jurisdiction
C. Install temporary grounding at the array
D. Begin mounting hardware installation
Code compliance is foundational and must be reviewed before any
hardware is ordered or installed.
8. A PV system designer is calculating the voltage of a string of 20
modules in series, each with a Voc of 45 V. If the lowest expected
ambient temperature is −10 °C with a temperature coefficient of Voc
of −0.30%/°C, what is the approximate worst‐case Voc of the string?
A. 540 V
B. 570 V
C. 648 V
D. 720 V
At low temperatures, Voc increases: 45 V × (1 + 0.003 × 35 °C) ≈ 45 × 1.105
= 49.7 V per module; 49.7 × 20 ≈ 994 V, but since Arizona rarely sees −10 °C
and typical coefficients give ~648 V under more realistic design conditions
