A.U.C. 351 PHOTOVOLTAIC (SOLAR PANEL) ELECTRICAL SYSTEMS || VERY FLAWLESS.
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A.U.C. 351 PHOTOVOLTAIC ELECTRICAL S
Institution
A.U.C. 351 PHOTOVOLTAIC ELECTRICAL S
Both residential and commercial solar photovoltaic systems operate on the same principle and both pose similar dangers, the greatest hazard of which is ____? correct answers direct current (DC) shock
The residential system generally is smaller and may contain fewer safety features than the large...
A.U.C. 351 PHOTOVOLTAIC (SOLAR PANEL)
ELECTRICAL SYSTEMS || VERY FLAWLESS.
Both residential and commercial solar photovoltaic systems operate on the same principle and
both pose similar dangers, the greatest hazard of which is ____? correct answers direct current
(DC) shock
The residential system generally is smaller and may contain fewer safety features than the larger
commercial system.
Most photovoltaics are made primarily of ____?, the second most abundant element in the earth's
crust, and the same semiconductor material used for computers. correct answers Silicon
T or F?
PV systems can still produce electricity at night correct answers False:
PV systems can still produce electricity on cloudy days, but not as much as they do on sunny
days. PV systems do not produce electricity at night.
The basic PV or solar cell produces only a small amount of power (1-2 watts). To produce more
power, solar cells (about 40) can be interconnected to form modules (panels). PV modules range
in output from __ to ___ watts.
A) 10 - 300
B) 100 - 350
C) 200 - 300
D) 10 - 250 correct answers A) 10 - 300
If more power is needed, several modules can be installed to form a PV array. About 20 to 30 PV
modules typically will provide enough power for a household.
The photovoltaic cell is the device that converts the sun's light energy into electricity by means
of the photovoltaic effect. The cells convert solar energy into direct current electricity. They are
typically __?-__?% efficient. It is the fundamental component of a PV energy system.
A) 12 - 20
B) 15 - 25
C) 10 - 20
D) 12 - 32 correct answers A) 12 - 20
The modules in a PV array are normally first connected in ____? to obtain the correct voltage for
the system (residential system outputs of 600 volts are common); individual leads are then
connected in _____? to allow the system to add more current (amperage).
A) series, series
B) parallel, parallel
C) parallel, series
D) series, parallel correct answers D) series, parallel
Most PV arrays use an inverter to convert the DC power produced into alternating current (AC)
that can tie into existing infrastructure to power lights and other electrical loads.
, On-grid connected systems utilize grid-tie inverters that are integrated with the public utility. In a
blackout situation does this system shut off automatically to eliminate the hazard of back-
feeding? correct answers YES
For safety reasons, grid-tie inverters should shut off automatically and cease operation during a
blackout situation to eliminate the hazard of back-feeding into a fault and creating a hazardous
condition for utility workers coming into contact with electric lines while working to restore
power in an emergency. Batteries may also be used for these type systems to store power where
the consumer wants to have electricity in the event of a blackout.
Stand-alone systems generally provide 12 or 24 volts DC. An inverter will convert this voltage to
___? volts AC. correct answers 220
The following definition would be correct for what type of roof installation?
Bulky and constructed with a grid-like system of supports (aluminum or steel) that are affixed
directly to roof joists using metal hardware. Also known as a universal mounting because it can
be installed both on rooftops as well as on the ground. These systems atop roofs must be installed
to withstand wind loads. They are typically used with larger solar panel systems.
A) Stand Mounted
B) Flush Mounted
C) Integrated Design
D) Canopy Design correct answers A) Stand Mounted
The following definition would be correct for what type of roof installation?
These PV arrays are achieved by placing a metal end bracket on each side of the module and
elevating it just several inches from the surface to allow for cooling air circulation. The bracket
is then attached to the roof. They are commonly used with small solar arrays and on peaked roofs
because the structural design cannot support large ones.
A) Stand Mounted
B) Flush Mounted
C) Integrated Design
D) Canopy Design correct answers B) Flush Mounted
The following definition would be correct for what type of roof installation?
PV arrays serve as a structural element (roof, wall, canopy or skylight). It thereby reduces
concentrations of added weight and avoids penetrations required for mountings and wiring. It
also reduces the vulnerability of the equipment to high winds. The photovoltaic shingle, made to
look like conventional asphalt shingles, is one such technology.
A) Stand Mounted
B) Flush Mounted
C) Integrated Design
D) Canopy Design correct answers C) Integrated Design
What two types of roof installations may be difficult or impossible to detect during nighttime
hours? correct answers Integrated, as well as flush-mounted arrays, may be difficult or
impossible to detect during nighttime hours.
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