NABCEP PV Associate - Questions With Complete
Solutions
Voltmeter (and how to use?) Right Ans - 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 Right Ans - A device used to measure resistance. Multimeters
can function as ohmmeters.
Apparent Power Right Ans - In AC transmission, the measure of Volts times
Amperes: Voltamperes (VA).
Current at which body's muscles contract? Right Ans - 10 Milliamperes
(aA)
STC, PTC, NOCT, and CEC Right Ans - 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?)
Right Ans - 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 Right Ans - National Electric Code. It is a federal regulation, but
enforcement is typically at the local level.
diversion load Right Ans - 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 Right Ans - National Recognized Testing Laboratory
Solutions
Voltmeter (and how to use?) Right Ans - 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 Right Ans - A device used to measure resistance. Multimeters
can function as ohmmeters.
Apparent Power Right Ans - In AC transmission, the measure of Volts times
Amperes: Voltamperes (VA).
Current at which body's muscles contract? Right Ans - 10 Milliamperes
(aA)
STC, PTC, NOCT, and CEC Right Ans - 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?)
Right Ans - 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 Right Ans - National Electric Code. It is a federal regulation, but
enforcement is typically at the local level.
diversion load Right Ans - 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 Right Ans - National Recognized Testing Laboratory
