NABCEP STUDY GUIDE Questions with Correct
Answers
Balance of System Compontents Correct Answer-Used to conduct,
distribute and control flow of power in the system. (Everything besides
modules and inverters).
Power Conditioning Components Correct Answer-Inverters, Charge
Controllers, Maximum Power Point Trackers
Stand Alone PV Systems Correct Answer-Operate independently of
other electrical systems (ie the Grid)
Interactive PV Systems Correct Answer-Operate in parallel and are
interconnected and synchronized with the electrical grid.
Power Correct Answer-Power is the RATE of transferring energy.
Expressed in Watts.
*Think of an hourly wage**
Energy (definition) Correct Answer-The TOTAL amount of power used
over time
**Think Total Income**
Energy (Equation) Correct Answer-Energy (Wh) = Avg. Power (W) x
Time (hr)
,1 Megawatt = ? Correct Answer-1,000,000 Watts
(Myyyyyyyyyyyy..........KingHenrysDrunkenUncleDrinksChocolateMilk
Power Density (Define) Correct Answer-Power per area of measurement
(Watts/Square Foot)
Power Density (Equation) Correct Answer-Power Density of Module =
Watts of Module / Square Footage of Module
Ex:
175 W module that is 14.4 Square Feet has power density of 12.2 W/sf
Solar Azimuth Angle Correct Answer-Defines the direction of the sun's
horizontal projection relative to a point on Earth.
Solar Altitude Angle Correct Answer-Defines the Suns elevation above
the horizon.
Zenith Angle Correct Answer-Angle of the sun in comparison to the
zenith (90 degrees)
Opposite of Altitude Angle (added together the two should be 90)
,Sun Path Diagram Correct Answer-A graphical representation of the
Sun's altitude and Azimuth angles over a given day of the year (for a
specific latitude)
Solar Noon Correct Answer-The local time when the Sun is at it's
highest point in the sky and crossing the local meridian (line of
Longitude).
It's rarely noon.
Best way to find it is to find the projected sunset and sunrise time and
then determine the midway point.
Summer Solstice Correct Answer-First Day of Summer (June 21st)
Winter Solstice Correct Answer-First Day of Winter (December 21st)
Fall Equinox Correct Answer-First Day of Fall (September 21st)
Spring Equinox Correct Answer-First Day of Spring (March 21st)
Declination Correct Answer-The angular distance of a point north or
south of the celestial equator.
*The sun varies + or - 23.45 degrees throughout the year
, Determine Solar Altitude Angles for Region Correct Answer-Maximum
and Minimum Solar Altitude Angles are determined by the Winter and
Summer Solstice.
The equation is as follows:
90 - (Latitude) + Solar Declination
Example:
At Latitude 40 the range would be determined as follows
SUMMER SOLSTICE
90 - 40 + 23.45 = 73.45
WINTER SOLSTICE
90 - 40 + (-23.45) = 26.55
ALTITUDE ANGLE RANGE FOR 40 Deg LAT
73.45 to 26.55
Solar Window Correct Answer-The range of Sun paths for a specific
latitude between Winter and Summer solstices.
Answers
Balance of System Compontents Correct Answer-Used to conduct,
distribute and control flow of power in the system. (Everything besides
modules and inverters).
Power Conditioning Components Correct Answer-Inverters, Charge
Controllers, Maximum Power Point Trackers
Stand Alone PV Systems Correct Answer-Operate independently of
other electrical systems (ie the Grid)
Interactive PV Systems Correct Answer-Operate in parallel and are
interconnected and synchronized with the electrical grid.
Power Correct Answer-Power is the RATE of transferring energy.
Expressed in Watts.
*Think of an hourly wage**
Energy (definition) Correct Answer-The TOTAL amount of power used
over time
**Think Total Income**
Energy (Equation) Correct Answer-Energy (Wh) = Avg. Power (W) x
Time (hr)
,1 Megawatt = ? Correct Answer-1,000,000 Watts
(Myyyyyyyyyyyy..........KingHenrysDrunkenUncleDrinksChocolateMilk
Power Density (Define) Correct Answer-Power per area of measurement
(Watts/Square Foot)
Power Density (Equation) Correct Answer-Power Density of Module =
Watts of Module / Square Footage of Module
Ex:
175 W module that is 14.4 Square Feet has power density of 12.2 W/sf
Solar Azimuth Angle Correct Answer-Defines the direction of the sun's
horizontal projection relative to a point on Earth.
Solar Altitude Angle Correct Answer-Defines the Suns elevation above
the horizon.
Zenith Angle Correct Answer-Angle of the sun in comparison to the
zenith (90 degrees)
Opposite of Altitude Angle (added together the two should be 90)
,Sun Path Diagram Correct Answer-A graphical representation of the
Sun's altitude and Azimuth angles over a given day of the year (for a
specific latitude)
Solar Noon Correct Answer-The local time when the Sun is at it's
highest point in the sky and crossing the local meridian (line of
Longitude).
It's rarely noon.
Best way to find it is to find the projected sunset and sunrise time and
then determine the midway point.
Summer Solstice Correct Answer-First Day of Summer (June 21st)
Winter Solstice Correct Answer-First Day of Winter (December 21st)
Fall Equinox Correct Answer-First Day of Fall (September 21st)
Spring Equinox Correct Answer-First Day of Spring (March 21st)
Declination Correct Answer-The angular distance of a point north or
south of the celestial equator.
*The sun varies + or - 23.45 degrees throughout the year
, Determine Solar Altitude Angles for Region Correct Answer-Maximum
and Minimum Solar Altitude Angles are determined by the Winter and
Summer Solstice.
The equation is as follows:
90 - (Latitude) + Solar Declination
Example:
At Latitude 40 the range would be determined as follows
SUMMER SOLSTICE
90 - 40 + 23.45 = 73.45
WINTER SOLSTICE
90 - 40 + (-23.45) = 26.55
ALTITUDE ANGLE RANGE FOR 40 Deg LAT
73.45 to 26.55
Solar Window Correct Answer-The range of Sun paths for a specific
latitude between Winter and Summer solstices.
