NABCEP PRACTICE QUESTIONS &
ANSWERS(RATED A+)
If an array is facing south at equinox at noon, what must the tilt angle be in order for the
array to face directly at the sun at latitude 30? - ANSWERA. 33 degrees
B. 48 degrees
C. 18 degrees
D. 30 degrees
The temperature rating of the insulation of a conductor when designing a PV system
effects the - ANSWERA. ability of the wire to withstand fire
B. ability of the wire to withstand smoke
C. ability of the wire to carry current
D. ability of the wire to withstand physical damag
When a bypass diode kicks in from a leaf on a solar cell, which parameter would you
see reduced on a single string with string level MPPT? - ANSWERA. Current
B. Voltage
C. Ohms
D. Amp hours
Given a PV module with the following characteristics, what would be the expected
output at Standard Test Conditions if the inverter and PV were working perfectly and
sending power to the grid? 20 in series 1 PV source circuit Voc = 44V Vmp = 35.2V
Power = 305W Isc = 9.27A - ANSWERA. 704V and 8.66A
B. 600V and 8A
C. 1000V and 8.2A
D. 700V and 9.27A
Which is the best and safest way to determine current in a PV output circuit? -
ANSWERClamp on ammeter
A remote cabin uses the loads below per day, how much total energy is used per day?
1000W toaster for 6 minutes 1.2kW hot water heating element for 3 hours per day
Three 17W LED lights for 3 hours per day iPhone 100 charger at 20W for 3 hours per
day - ANSWER3.9 kWh
What is "blocking" used for? - ANSWERAttaching to a roof in a place where there is no
rafter
If you are going to work on the roof to fix a ground fault and the dc disconnect is on the
ground level, which of the following is the best safety procedure? - ANSWERe roof
B. Removing the GFCI fuse before going on the roof
C. Leaving the disconnect in the on position
, D. Lockout Tagout
Who makes requirements for electrical safety for employees? - ANSWEROSHA
Typical utility interactive systems in the US will - ANSWERExport to the utility extra
power for credit
What is the shape of a typical monocrystalline solar wafer? - ANSWERSquare with
rounded corners
What is the largest array size of the following if you are using a 24V battery bank and a
20A charge controller? - ANSWER280W
Which of the following is able to change dc power into ac power with a predetermined
specific frequency and voltage? - ANSWERInverter
What color wires can be used for equipment grounding (earthing is international term)
wires in the US? - ANSWERGreen, bare or green with yellow stripe
What does MPPT stand for? - ANSWERMaximum power point tracking
Which is the best solution of the following for multiple orientations when designing a PV
system? - ANSWERMicroinverter
If you want to use modules that are dissimilar and in multiple orientations, what is the
best type of system to use? - ANSWERDc-to-dc converter (power optimizer) system
In the western part of the USA and Canada, what direction does the north arrow of a
magnetic compass point? - ANSWEREast of north
You are rebuilding an old battery system for a PV museum and everything is in amps
and amp hours. You are told that the system needs to have 33% more PV production
on average than what the loads require. The loads will require 20Ah per day and the
insolation will be 5PSH. If the module current at STC is 8A at Imp and 9A at Isc, how
many PV source circuits would be needed to meet the minimum requirements stated
here? - ANSWER1
Which tilt angle from horizontal would get the best annual production from a location in
Toronto at 43 degrees north? - ANSWER42 degrees
A multimodal inverter that has an internal automatic transfer switch would have to
monitor what in order to transfer to backup power? - ANSWERPrimary power source
voltage
ANSWERS(RATED A+)
If an array is facing south at equinox at noon, what must the tilt angle be in order for the
array to face directly at the sun at latitude 30? - ANSWERA. 33 degrees
B. 48 degrees
C. 18 degrees
D. 30 degrees
The temperature rating of the insulation of a conductor when designing a PV system
effects the - ANSWERA. ability of the wire to withstand fire
B. ability of the wire to withstand smoke
C. ability of the wire to carry current
D. ability of the wire to withstand physical damag
When a bypass diode kicks in from a leaf on a solar cell, which parameter would you
see reduced on a single string with string level MPPT? - ANSWERA. Current
B. Voltage
C. Ohms
D. Amp hours
Given a PV module with the following characteristics, what would be the expected
output at Standard Test Conditions if the inverter and PV were working perfectly and
sending power to the grid? 20 in series 1 PV source circuit Voc = 44V Vmp = 35.2V
Power = 305W Isc = 9.27A - ANSWERA. 704V and 8.66A
B. 600V and 8A
C. 1000V and 8.2A
D. 700V and 9.27A
Which is the best and safest way to determine current in a PV output circuit? -
ANSWERClamp on ammeter
A remote cabin uses the loads below per day, how much total energy is used per day?
1000W toaster for 6 minutes 1.2kW hot water heating element for 3 hours per day
Three 17W LED lights for 3 hours per day iPhone 100 charger at 20W for 3 hours per
day - ANSWER3.9 kWh
What is "blocking" used for? - ANSWERAttaching to a roof in a place where there is no
rafter
If you are going to work on the roof to fix a ground fault and the dc disconnect is on the
ground level, which of the following is the best safety procedure? - ANSWERe roof
B. Removing the GFCI fuse before going on the roof
C. Leaving the disconnect in the on position
, D. Lockout Tagout
Who makes requirements for electrical safety for employees? - ANSWEROSHA
Typical utility interactive systems in the US will - ANSWERExport to the utility extra
power for credit
What is the shape of a typical monocrystalline solar wafer? - ANSWERSquare with
rounded corners
What is the largest array size of the following if you are using a 24V battery bank and a
20A charge controller? - ANSWER280W
Which of the following is able to change dc power into ac power with a predetermined
specific frequency and voltage? - ANSWERInverter
What color wires can be used for equipment grounding (earthing is international term)
wires in the US? - ANSWERGreen, bare or green with yellow stripe
What does MPPT stand for? - ANSWERMaximum power point tracking
Which is the best solution of the following for multiple orientations when designing a PV
system? - ANSWERMicroinverter
If you want to use modules that are dissimilar and in multiple orientations, what is the
best type of system to use? - ANSWERDc-to-dc converter (power optimizer) system
In the western part of the USA and Canada, what direction does the north arrow of a
magnetic compass point? - ANSWEREast of north
You are rebuilding an old battery system for a PV museum and everything is in amps
and amp hours. You are told that the system needs to have 33% more PV production
on average than what the loads require. The loads will require 20Ah per day and the
insolation will be 5PSH. If the module current at STC is 8A at Imp and 9A at Isc, how
many PV source circuits would be needed to meet the minimum requirements stated
here? - ANSWER1
Which tilt angle from horizontal would get the best annual production from a location in
Toronto at 43 degrees north? - ANSWER42 degrees
A multimodal inverter that has an internal automatic transfer switch would have to
monitor what in order to transfer to backup power? - ANSWERPrimary power source
voltage
