NABCEP Test Prep with all Correct & 100% Verified
Answers |Latest Update |Already Graded A+
What is the most common PV system configuration in North America? ✔Correct Answer-Net-
metered grid-direct system
What happens to a grid direct system when the power goes down? ✔Correct Answer-The inverter
is designed/required per UL and IEEE standards to shut off instantly. No grid power, no solar power.
What terminals are connected in a series connection/PV source circuit? ✔Correct Answer-Positive
to Negative
In a series string what happens to the current and voltage? ✔Correct Answer-Current remains the
same, and voltage is additive
According to the NEC, what is the official name of a series string? ✔Correct Answer-PV Source
Circuit
After making a series string, what is done with the remaining terminals? ✔Correct Answer-The
positive on one module, and the negative on the other become the "homerruns" or leads
What tool do you use to ensure your series connections are wired properly? ✔Correct Answer-
Digital Multimeter
How can you tell if all panels are working in a series string? ✔Correct Answer-The voltage should
equal the open circuit voltage of all panels added together.
How does the power compare when if you were to wire the same two panels in series then in
parallel? ✔Correct Answer-They would be the same
How do you wire modules in parallel? ✔Correct Answer-The like terminals are connected
together... + to + and - to -
When modules are wired in parallel, what happens to the voltage? ✔Correct Answer-It remains
the same
When multiple modules are wired in parallel at the combiner box, what is the output wiring
considered? ✔Correct Answer-PV Output Circuit
What connection between modules causes the current to become additive? ✔Correct Answer-
Parallel Connections
What are the five main values plotted on an I-V Curve? ✔Correct Answer--Isc: Short Circuit Current
-Imp: Maximum Power Current
-Mpp: Maximum Power Point
-Vmp: Maximum Power Voltage
-Voc: Open Circuit Voltage
, What is the short circuit current? (Isc) ✔Correct Answer-The maximum current that can be
produced by the module under the conditions of a circuit with no resistance.
What is the maximum power point? ✔Correct Answer-The product of the maximum power voltage
(Vmp) and the maximum power current (Imp). This point is where the module will produce the most
power under the test conditions specified for the curve - STC in this case
What two values go into determining the Mpp? ✔Correct Answer-Vmp: Maximum Power Voltage
Imp: Maximum Power Current
What is Imp? ✔Correct Answer-Maximum Power Current: The current that will be produced when
a module is producing maximum power.
What is Maximum Power Voltage? ✔Correct Answer-Vmp: The voltage that will be produced when
a module is producing maximum power.
What is Voc? ✔Correct Answer-Open Circuit Voltage: The maximum voltage a module can produce.
What determines STC? ✔Correct Answer-25 degrees Celsius & 1,000W/m^2 irradiance
As temperature increases, what happens to the voltage? ✔Correct Answer-Voltage decreases
As temperature increases, what happens to the current? ✔Correct Answer-Very little
What effect does temperature have on voltage? ✔Correct Answer-They are inversely proportional.
As temperature goes up, voltage goes down. As temperature goes down, voltage goes up.
What tool is used to measure cell temperature? ✔Correct Answer-A temperature gun
How does irradiance impact voltage? ✔Correct Answer-It has a very small impact
What happens to the current as the irradiance increases? ✔Correct Answer-The current increases
What effect does irradiance have on current? ✔Correct Answer-As one goes up, the other goes up
At what point does irradiance start to have an effect on voltage? ✔Correct Answer-500 w/m^2 and
below you may begin to notice 5-10% below what you would expect based on the cell temperature
at the time
What tool is used to measure irradiance? ✔Correct Answer-Pyranometer
If my rated Imp of a module is 8 Amps, and my irradiance is 500 W/m^2 what would be my expected
current reading? ✔Correct Answer-4 Amps
What is the solar azimuth angle? ✔Correct Answer-The position of the sun relative to North
What is the solar altitude angle? ✔Correct Answer-The sun's position in degrees above the
horizon.
What is the tilt angle? ✔Correct Answer-The degrees from flat that an array is angled
Answers |Latest Update |Already Graded A+
What is the most common PV system configuration in North America? ✔Correct Answer-Net-
metered grid-direct system
What happens to a grid direct system when the power goes down? ✔Correct Answer-The inverter
is designed/required per UL and IEEE standards to shut off instantly. No grid power, no solar power.
What terminals are connected in a series connection/PV source circuit? ✔Correct Answer-Positive
to Negative
In a series string what happens to the current and voltage? ✔Correct Answer-Current remains the
same, and voltage is additive
According to the NEC, what is the official name of a series string? ✔Correct Answer-PV Source
Circuit
After making a series string, what is done with the remaining terminals? ✔Correct Answer-The
positive on one module, and the negative on the other become the "homerruns" or leads
What tool do you use to ensure your series connections are wired properly? ✔Correct Answer-
Digital Multimeter
How can you tell if all panels are working in a series string? ✔Correct Answer-The voltage should
equal the open circuit voltage of all panels added together.
How does the power compare when if you were to wire the same two panels in series then in
parallel? ✔Correct Answer-They would be the same
How do you wire modules in parallel? ✔Correct Answer-The like terminals are connected
together... + to + and - to -
When modules are wired in parallel, what happens to the voltage? ✔Correct Answer-It remains
the same
When multiple modules are wired in parallel at the combiner box, what is the output wiring
considered? ✔Correct Answer-PV Output Circuit
What connection between modules causes the current to become additive? ✔Correct Answer-
Parallel Connections
What are the five main values plotted on an I-V Curve? ✔Correct Answer--Isc: Short Circuit Current
-Imp: Maximum Power Current
-Mpp: Maximum Power Point
-Vmp: Maximum Power Voltage
-Voc: Open Circuit Voltage
, What is the short circuit current? (Isc) ✔Correct Answer-The maximum current that can be
produced by the module under the conditions of a circuit with no resistance.
What is the maximum power point? ✔Correct Answer-The product of the maximum power voltage
(Vmp) and the maximum power current (Imp). This point is where the module will produce the most
power under the test conditions specified for the curve - STC in this case
What two values go into determining the Mpp? ✔Correct Answer-Vmp: Maximum Power Voltage
Imp: Maximum Power Current
What is Imp? ✔Correct Answer-Maximum Power Current: The current that will be produced when
a module is producing maximum power.
What is Maximum Power Voltage? ✔Correct Answer-Vmp: The voltage that will be produced when
a module is producing maximum power.
What is Voc? ✔Correct Answer-Open Circuit Voltage: The maximum voltage a module can produce.
What determines STC? ✔Correct Answer-25 degrees Celsius & 1,000W/m^2 irradiance
As temperature increases, what happens to the voltage? ✔Correct Answer-Voltage decreases
As temperature increases, what happens to the current? ✔Correct Answer-Very little
What effect does temperature have on voltage? ✔Correct Answer-They are inversely proportional.
As temperature goes up, voltage goes down. As temperature goes down, voltage goes up.
What tool is used to measure cell temperature? ✔Correct Answer-A temperature gun
How does irradiance impact voltage? ✔Correct Answer-It has a very small impact
What happens to the current as the irradiance increases? ✔Correct Answer-The current increases
What effect does irradiance have on current? ✔Correct Answer-As one goes up, the other goes up
At what point does irradiance start to have an effect on voltage? ✔Correct Answer-500 w/m^2 and
below you may begin to notice 5-10% below what you would expect based on the cell temperature
at the time
What tool is used to measure irradiance? ✔Correct Answer-Pyranometer
If my rated Imp of a module is 8 Amps, and my irradiance is 500 W/m^2 what would be my expected
current reading? ✔Correct Answer-4 Amps
What is the solar azimuth angle? ✔Correct Answer-The position of the sun relative to North
What is the solar altitude angle? ✔Correct Answer-The sun's position in degrees above the
horizon.
What is the tilt angle? ✔Correct Answer-The degrees from flat that an array is angled
