AR SOL Solar Energy Systems
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
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1. What is the primary function of a photovoltaic (PV) solar panel?
A. Store energy
B. Convert sunlight into electricity
C. Heat water
D. Provide insulation
B. Convert sunlight into electricity
Rationale: Photovoltaic panels convert sunlight directly into
electrical energy using the photovoltaic effect.
2. Which type of solar panel typically has the highest efficiency?
A. Monocrystalline
B. Polycrystalline
C. Thin-film
D. Amorphous
A. Monocrystalline
Rationale: Monocrystalline panels are made from single-crystal
silicon, providing higher efficiency compared to other panel types.
3. What does the term “solar inverter” refer to?
A. A device that stores solar energy
B. A device that converts DC to AC electricity
C. A device that tracks sunlight
D. A protective cover for solar panels
B. A device that converts DC to AC electricity
, Rationale: Solar inverters convert the DC electricity generated by
panels into AC electricity for use in homes and businesses.
4. Which of the following is the main advantage of a grid-tied solar
system?
A. Works during power outages
B. Does not require an inverter
C. Can feed excess electricity back to the grid
D. Requires no permits
C. Can feed excess electricity back to the grid
Rationale: Grid-tied systems allow homeowners to send excess energy
to the utility grid, often earning credits.
5. What is the primary purpose of a charge controller in a solar system?
A. Convert DC to AC
B. Regulate battery charging
C. Track sun position
D. Increase solar panel output
B. Regulate battery charging
Rationale: Charge controllers prevent batteries from overcharging
and extend battery life.
6. Which type of solar thermal system is most suitable for residential
water heating?
A. Flat-plate collector
B. Parabolic trough
C. Concentrated solar power
D. Dish Stirling system
A. Flat-plate collector
Rationale: Flat-plate collectors are simple, cost-effective, and
efficient for residential water heating applications.
7. What is the standard test condition (STC) used to rate solar panels?
A. 1000 W/m², 25°C, AM 1.5 spectrum
B. 800 W/m², 20°C, AM 2.0 spectrum
C. 1200 W/m², 30°C, AM 1.0 spectrum
D. 500 W/m², 25°C, AM 1.5 spectrum
A. 1000 W/m², 25°C, AM 1.5 spectrum
Rationale: STC provides a uniform basis for comparing solar panel
performance under standard sunlight and temperature conditions.
, 8. Which factor most affects the performance of solar panels?
A. Wind speed
B. Humidity
C. Angle and orientation to the sun
D. Noise levels
C. Angle and orientation to the sun
Rationale: Proper tilt and orientation maximize sunlight exposure,
improving energy output.
9. What does “kWp” stand for in solar energy systems?
A. Kilowatt power
B. Kilowatt peak
C. Kinetic watt potential
D. Kelvin watt pressure
B. Kilowatt peak
Rationale: kWp indicates the maximum power output a solar system
can produce under standard test conditions.
10. Which safety device protects a solar PV system from
overcurrent?
A. Charge controller
B. Circuit breaker
C. Inverter
D. Solar tracker
B. Circuit breaker
Rationale: Circuit breakers prevent damage by interrupting excessive
current flow.
11. What is “Net Metering” in solar energy systems?
A. A method to measure sunlight intensity
B. A system that allows users to sell excess energy back to the grid
C. A type of battery storage
D. A method to track solar panel efficiency
B. A system that allows users to sell excess energy back to the grid
Rationale: Net metering credits solar energy producers for the
surplus electricity they supply to the grid.
12. Which type of battery is commonly used in residential solar
systems?
A. Lead-acid
B. Lithium-ion
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. What is the primary function of a photovoltaic (PV) solar panel?
A. Store energy
B. Convert sunlight into electricity
C. Heat water
D. Provide insulation
B. Convert sunlight into electricity
Rationale: Photovoltaic panels convert sunlight directly into
electrical energy using the photovoltaic effect.
2. Which type of solar panel typically has the highest efficiency?
A. Monocrystalline
B. Polycrystalline
C. Thin-film
D. Amorphous
A. Monocrystalline
Rationale: Monocrystalline panels are made from single-crystal
silicon, providing higher efficiency compared to other panel types.
3. What does the term “solar inverter” refer to?
A. A device that stores solar energy
B. A device that converts DC to AC electricity
C. A device that tracks sunlight
D. A protective cover for solar panels
B. A device that converts DC to AC electricity
, Rationale: Solar inverters convert the DC electricity generated by
panels into AC electricity for use in homes and businesses.
4. Which of the following is the main advantage of a grid-tied solar
system?
A. Works during power outages
B. Does not require an inverter
C. Can feed excess electricity back to the grid
D. Requires no permits
C. Can feed excess electricity back to the grid
Rationale: Grid-tied systems allow homeowners to send excess energy
to the utility grid, often earning credits.
5. What is the primary purpose of a charge controller in a solar system?
A. Convert DC to AC
B. Regulate battery charging
C. Track sun position
D. Increase solar panel output
B. Regulate battery charging
Rationale: Charge controllers prevent batteries from overcharging
and extend battery life.
6. Which type of solar thermal system is most suitable for residential
water heating?
A. Flat-plate collector
B. Parabolic trough
C. Concentrated solar power
D. Dish Stirling system
A. Flat-plate collector
Rationale: Flat-plate collectors are simple, cost-effective, and
efficient for residential water heating applications.
7. What is the standard test condition (STC) used to rate solar panels?
A. 1000 W/m², 25°C, AM 1.5 spectrum
B. 800 W/m², 20°C, AM 2.0 spectrum
C. 1200 W/m², 30°C, AM 1.0 spectrum
D. 500 W/m², 25°C, AM 1.5 spectrum
A. 1000 W/m², 25°C, AM 1.5 spectrum
Rationale: STC provides a uniform basis for comparing solar panel
performance under standard sunlight and temperature conditions.
, 8. Which factor most affects the performance of solar panels?
A. Wind speed
B. Humidity
C. Angle and orientation to the sun
D. Noise levels
C. Angle and orientation to the sun
Rationale: Proper tilt and orientation maximize sunlight exposure,
improving energy output.
9. What does “kWp” stand for in solar energy systems?
A. Kilowatt power
B. Kilowatt peak
C. Kinetic watt potential
D. Kelvin watt pressure
B. Kilowatt peak
Rationale: kWp indicates the maximum power output a solar system
can produce under standard test conditions.
10. Which safety device protects a solar PV system from
overcurrent?
A. Charge controller
B. Circuit breaker
C. Inverter
D. Solar tracker
B. Circuit breaker
Rationale: Circuit breakers prevent damage by interrupting excessive
current flow.
11. What is “Net Metering” in solar energy systems?
A. A method to measure sunlight intensity
B. A system that allows users to sell excess energy back to the grid
C. A type of battery storage
D. A method to track solar panel efficiency
B. A system that allows users to sell excess energy back to the grid
Rationale: Net metering credits solar energy producers for the
surplus electricity they supply to the grid.
12. Which type of battery is commonly used in residential solar
systems?
A. Lead-acid
B. Lithium-ion
