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NABCEP STUDY GUIDE QUESTIONS AND 100% CORRECT ANSWERS
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NABCEP STUDY GUIDE QUESTIONS AND 100%CORRECT ANSWERS
Balance of System Compontents - ANSWER Used to conduct, distribute and control flow
of power in the system. (Everything besides modules and inverters).
Power Conditioning Components - ANSWER Inverters, Charge Controllers, Maximum
Power Point Trackers
Stand Alone PV Systems - ANSWER Operate independently of other electrical systems
(ie the Grid)
Interactive PV Systems - ANSWER Operate in parallel and are interconnected and
synchronized with the electrical grid.
Power - ANSWER Power is the RATE of transferring energy. Expressed in Watts. *\
Think of an hourly wage**
Energy (definition) - ANSWER The TOTAL amount of power used over time
**Think Total Income**
Energy (Equation) - ANSWER Energy (Wh) = Avg. Power (W) x Time (hr)
1 Megawatt = ? - ANSWER 1,000,000 Watts
(Myyyyyyyyyyyy.KingHenrysDrunkenUncleDrinksChocolateMilk
Power Density (Define) - ANSWER Power per area of measurement (Watts/Square Foot)
,Power Density Equation - ANSWER Watts of Module / Square Footage of Module = Power
Density of Module
Ex:
175 W module that is 14.4 Square Feet has power density of 12.2 W/sf
Solar Azimuth Angle - ANSWER This is the angle that describes the direction of the sun's
horizontal projection relative to a point on Earth.
Solar Altitude Angle - ANSWER This is the Suns elevation above the horizon.
Angle of the sun relative to the zenith (90 degrees)
Opposite of Altitude Angle-added together the two should be 90
Sun Path Diagram - ANSWER A diagram that plots the Sun's altitude and Azimuth angles
for a specific day of the year, for a particular latitude
Solar Noon - ANSWER The local time when the Sun is at it's highest point in the sky and
crossing the local meridian (line of Longitude).
Rarely noon.
Best way to find it is to find the projected sunset and sunrise time and then find the
midway point.
Summer Solstice - ANSWER First Day of Summer (June 21st)
,Winter Solstice - ANSWER First Day of Winter (December 21st)
Fall Equinox - ANSWER First Day of Fall (September 21st)
Spring Equinox - ANSWER First Day of Spring (March 21st)
Declination - 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 - ANSWER Maximum and Minimum Solar
Altitude Angles are determined by the Winter and Summer Solstice.
The formula is as follows:
90 - (Latitude) + Solar Declination
Example:
At Latitude 40 the range would be calculated as
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 - ANSWER The path variations of the Sun for a particular latitude between
Winter and Summer solstices.
What you are seeing on the Suneye
Array Azimuth Angle - ANSWER The direction an array surface faces based on a
compass heading or relative to due south
Array Tilt Angle - ANSWER The array tilt angle is the angle between the array surface
and the horizontal plane
Magnetic Declination - ANSWER The angle between magnetic north and the true
geographic North Pole.
Positive Magnetic Declination - ANSWER When Magnetic North is East of true north.
Magnetic Declination Negative - ANSWER When Magnetic North is West of true north.
Agonic Line - ANSWER Region where magnetic declination is zero
Contour Chart - ANSWER Compares the effects of array orientation on the amount of
Solar energy received.
Peak Sun Hours - ANSWER Average daily amount of solar energy received on a given
surface.
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