NABCEP PV ASSOCIATE QUESTIONS
& ANSWERS(RATED A+)
Voltmeter (and how to use?) - ANSWER A device used to measure voltage, or electrical
potential energy difference.
To use: turn the voltmeter to a higher setting than the maximum expected voltage.
Touch the black to negative and the red to positive.
Ohmmeter - ANSWER A device used to measure resistance. Multimeters can function
as ohmmeters.
Apparent Power - ANSWER In AC transmission, the measure of Volts times Amperes:
Voltamperes (VA).
Current at which body's muscles contract? - ANSWER 10 Milliamperes (aA)
STC, PTC, NOCT, and CEC - ANSWER STC - 1000 w/m^2, 25 degree module temp,
1.5 atmospheres
PTC - 1000 w/m^2, 20 degree ambient temp, 1.5 atmospheres, 1 m/s wind speed (this
results in a module temp of about 50 degrees)
NOCT - 800 w/m^2, 20 degrees ambient, 1 m/s wind speed
CEC - Same as PTC
Voltage Drop (what does length/diameter of cable do to voltage drop?) - ANSWER A
decrease in voltage along a conductor through which current is flowing. As the length of
the cable increases, so does its resistance. To decrease voltage drop in a circuit, you
can increase the diameter of the conductors.
NEC - ANSWER National Electric Code. It is a federal regulation, but enforcement is
typically at the local level.
diversion load - ANSWER An auxiliary load that is not a critical system load, but is
always available to utilize the full array power in a useful way to protect a battery from
overcharge.
NRTL - ANSWER National Recognized Testing Laboratory
Maximum voltage on storage batteries for dwellings? - ANSWER Storage batteries for
dwellings shall have the cells connected so as to operate at less than 100 volts.
DSIRE - ANSWER Database of state incentives for renewables
IREC - ANSWER Interstate REC Standard Foudation
& ANSWERS(RATED A+)
Voltmeter (and how to use?) - ANSWER A device used to measure voltage, or electrical
potential energy difference.
To use: turn the voltmeter to a higher setting than the maximum expected voltage.
Touch the black to negative and the red to positive.
Ohmmeter - ANSWER A device used to measure resistance. Multimeters can function
as ohmmeters.
Apparent Power - ANSWER In AC transmission, the measure of Volts times Amperes:
Voltamperes (VA).
Current at which body's muscles contract? - ANSWER 10 Milliamperes (aA)
STC, PTC, NOCT, and CEC - ANSWER STC - 1000 w/m^2, 25 degree module temp,
1.5 atmospheres
PTC - 1000 w/m^2, 20 degree ambient temp, 1.5 atmospheres, 1 m/s wind speed (this
results in a module temp of about 50 degrees)
NOCT - 800 w/m^2, 20 degrees ambient, 1 m/s wind speed
CEC - Same as PTC
Voltage Drop (what does length/diameter of cable do to voltage drop?) - ANSWER A
decrease in voltage along a conductor through which current is flowing. As the length of
the cable increases, so does its resistance. To decrease voltage drop in a circuit, you
can increase the diameter of the conductors.
NEC - ANSWER National Electric Code. It is a federal regulation, but enforcement is
typically at the local level.
diversion load - ANSWER An auxiliary load that is not a critical system load, but is
always available to utilize the full array power in a useful way to protect a battery from
overcharge.
NRTL - ANSWER National Recognized Testing Laboratory
Maximum voltage on storage batteries for dwellings? - ANSWER Storage batteries for
dwellings shall have the cells connected so as to operate at less than 100 volts.
DSIRE - ANSWER Database of state incentives for renewables
IREC - ANSWER Interstate REC Standard Foudation
