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Question 1 of 10
1. Question
Why is regular PV more efficient than Building Integrated PV (BIPV)?
Correct
Ampacity, the rate of current a wire can carry, goes down when the temperature goes up. Regular PV is cooler than BIPV, so it can carry more current.
Incorrect
Ampacity, the rate of current a wire can carry, goes down when the temperature goes up. Regular PV is cooler than BIPV, so it can carry more current.
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Question 2 of 10
2. Question
Which of the following is the worst design error?
Correct
A series connection must have a uniform tilt and azimuth orientation.
Incorrect
A series connection must have a uniform tilt and azimuth orientation.
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Question 3 of 10
3. Question
A client needs a PV system for an off-grid home. Which type of PV is the most suitable?
Correct
The client will be off-grid, so a grid-tied PV will not work. A direct-coupled PV does not have a battery, so the off-grid home won’t have electricity during the night. Stand-alone PV systems are best for this purpose because they can store energy for the night.
Incorrect
The client will be off-grid, so a grid-tied PV will not work. A direct-coupled PV does not have a battery, so the off-grid home won’t have electricity during the night. Stand-alone PV systems are best for this purpose because they can store energy for the night.
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Question 4 of 10
4. Question
Determine how many modules can be put in a maximum 300V inverter. Module characteristics are Isc = 9A, Voc = 39V, and Vmp = 32V. Voc temperature correction factor is -0.28%/ºC, while low design temperature is -25ºC.
Correct
Solution:-25°C – 25°C = -50°C => (-50°C)(-0.28%/°C) = 14% increase Voc => (1.14)(39Voc) = 44.5V cold => 300V/44.5V = 6.74 => Round down to stay in inverter voltage limit = 6
Incorrect
Solution:-25°C – 25°C = -50°C => (-50°C)(-0.28%/°C) = 14% increase Voc => (1.14)(39Voc) = 44.5V cold => 300V/44.5V = 6.74 => Round down to stay in inverter voltage limit = 6
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Question 5 of 10
5. Question
John uses a 15W wall charger for 2 hours, and a 12V 2A lamp for 5 hours. How much energy did he use for the day? Express your answer in kWh.
Correct
Solution: Multiply voltage and current (12V)(2A) = 24 W => Multiply power consumed by lamp and time (24W)(5 hours) = 120Wh => Multiply power consumed by charger and hours (15W)(2 hours) = 30Wh => Add then divide by 1000 to convert Wh to kWh (120Wh +30Wh)/1000 = 0.15kWh
Incorrect
Solution: Multiply voltage and current (12V)(2A) = 24 W => Multiply power consumed by lamp and time (24W)(5 hours) = 120Wh => Multiply power consumed by charger and hours (15W)(2 hours) = 30Wh => Add then divide by 1000 to convert Wh to kWh (120Wh +30Wh)/1000 = 0.15kWh
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Question 6 of 10
6. Question
What’s the first step in using a digital multimeter?
Correct
Inspecting first is a general safety rule applicable to many situations.
Incorrect
Inspecting first is a general safety rule applicable to many situations.
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Question 7 of 10
7. Question
Which of the following is not a safe practice when installing PV?
Correct
The lifeline should be kept as short as possible to prevent the worker from hitting the ground. If it’s too long, it won’t be able to restrain the worker.
Incorrect
The lifeline should be kept as short as possible to prevent the worker from hitting the ground. If it’s too long, it won’t be able to restrain the worker.
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Question 8 of 10
8. Question
Which of these is not a disadvantage of PV systems?
Correct
Mercury is a byproduct of coal-generated power.
Incorrect
Mercury is a byproduct of coal-generated power.
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Question 9 of 10
9. Question
Which one is not a basic system sizing factor for grid-tied systems?
Correct
Grid-tied PV systems do not have batteries.
Incorrect
Grid-tied PV systems do not have batteries.
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Question 10 of 10
10. Question
During summer, the PV system is not generating as much energy as it should. Eliminate one possible cause from the statements below.
Correct
A long string of modules causes problems when it’s too cold, and the question specified that it is summer.
Incorrect
A long string of modules causes problems when it’s too cold, and the question specified that it is summer.