Term
According to code, which items must be grounded in a grid-tied PV system?
a. Panel racks c. Panel frames
b. DC disconnect box d. All of these |
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Definition
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|
Term
On a properly designed system, you can fit more panels on the roof if...
a. the tilt angle is at latitude
b. the tilt angle is less
c. the tilt angle is greater
d. tilt angle does not make a difference on
how many panels you can fit on the roof |
|
Definition
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|
Term
What is STC?
a. 1000 W/m2, 25°C, AM1.5 air mass
b. 1000 W/m2, 70° F
d. 1000 W/m2, 25°c. 1000 W/m2, 25°C, 1 mls wind
C. 1 mls wind |
|
Definition
a. 1000 W/m2, 25°C, 1.5 air mass
Pg 142-Standard test conditions is the most common and internationally accepted set of reference. |
|
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Term
An unacceptable method of connecting a roof rack support to the roof is ...
a. Poly-urethane adhesive
c. large washer supporting bolts through the OSB
b. Spanning or blocking
d. Unirac drywall screws into the rails |
|
Definition
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Term
When determining DC voltage drop, one has to calculate a distance. That distance is ...
a. the distance from the breaker panel to the
c. the distance from the inverter to the PV in inverter multiplied by 2 ft.
b. the distance from the inverter to the PV in d. the distance from the inverter to the PV in
k-ft multiplied by 2 k-ft. |
|
Definition
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|
Term
Of the following sealants used in PV-mounting roof penetrations, the acceptable sealant is ...
a. butyl rubber or polyurethane c. silicone caulk
b. acrylic or latex caulk d. fiberglass epoxy resin |
|
Definition
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|
Term
For stand-alone systems, inverter input depends on ...
a. battery allowable depth of discharge c. battery discharge current
b. array size current d. battery voltage |
|
Definition
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|
Term
OSHA requires that eye protection used in the workplace meet which of the following standards?
a. UL Section 690.5 c. IEEE 1703
b. IEC 1108-14 "d. ANSI Z87.1 |
|
Definition
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|
Term
If the open circuit voltage ofa crystalline silicon PV module is 315 Vat 25°C, then at 40°C, the voltage ofa
series string of 4 modules would be ...
a. somewhat higher than 1260 volts
b. 1260 volts |
|
Definition
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|
Term
. High voltage will trip a circuit breaker ...
a. voltage is not what trips a breaker
b. at the apex of a sine wave
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c. somewhat lower than 1260 volts
d. 315 volts
c. when it is over 600 VDC
d. when it is AC only |
|
Definition
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Term
A fall protection system must be in place for all work done at heights in excess of..
a. 4 ft.
b. 6 ft.
c. 8 ft.
d. 10 ft. |
|
Definition
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|
Term
A commercial "flat roof' ...
a. can not be penetrated so a ballasted
system must be used
b. always has a 0° slope
c. is an excellent application for composition shingles and FastJack mounts
d. is actually a very low slope roof |
|
Definition
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|
Term
According to the sun path diagram above, on a clear day, the sun will shine continuously in February
for ...
a. 4.5 hours
b. 5 hours and 45 min
c. less than 3.5 hours
d. more than 6 hours |
|
Definition
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|
Term
The 120% rule means ...
a. your bus bar fuses should be 120% derated c. The sum of the solar breaker and the main
for ampacity breaker must be 120% less than the busbar
b. your parallel sources of AC power can
never exceed the bus bar rating
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rating
d. you can have 2 sources feeding the panel
busbar that exceed the busbar rating
2
NAME: -------------------------------- DATE: --------
would not affect the array |
|
Definition
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|
Term
The effect of a charge controller installed in a hotter ambient temperature than the battery bank is ...
a. voltage regulation setpoint will be too c. there is no effect on current
high
b. voltage regulation setpoint will be too low d. current to the battery will be measured
excessively |
|
Definition
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|
Term
When installing a grid-tied PV system on a 30-degree south-facing metal roof, which of the following best
describes the safety equipment that should be used when working on the roof?
27.
a. Rappelling gear, safety glasses, steel-toed c. Safety rope & harness, hard hat, insulated
boots metal tools
b. Gloves, hard hat, steel-toed boots d. Safety rope & harness, gloves, non-slip
shoes |
|
Definition
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|
Term
Assuming that ifthe altitude is less 30° when the azimuth is 45° an array will be shaded, the months when the
array will be shaded at any time between 9 a.m and 3 p.m include ...
a. September through March c. none
b. April through August d. November, December, & January |
|
Definition
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Term
The NEC. .. NA'nDNfJt.. £ lecTle.1 ct41.- C'odea.
is a highly enforced national law
b. stands for ,electrical Code"
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c. is published by the National Fire
Protection Association
d. has strict laws about voltage drop
4
NAME: -------------------------------------- DATE: --------- |
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Definition
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|
Term
Blocking diodes main function is ...
a. prevent controller from shorting battery
bank
c. to prevent reverse current flow
b. to pass current around PV cells or
modules
d. minimize power output loss |
|
Definition
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|
Term
. For a 12 volt, 1458.3Ah total capacity system, how many 500Ah 12 volt batteries are needed?
a. 3.0 c. 2.4
b. 2.0 d. 1.0 |
|
Definition
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|
Term
Which of the following does NOT require UL or equivalent listing?
a. charge controllers c. battery cables
b. surge protectors d. lag bolts |
|
Definition
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|
Term
Which of the following statements is true regarding temperature effects on PV modules?
a. Lower temp increases I & increases V c. Higher temp increases V & increases I
b. Lower temp increases V & decreases I d. Higher temp decreases V & decreases P |
|
Definition
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|
Term
An equinox is when ...
a. solar declination is at maximum
c. solar declination equals zero
b. solar declination is at minimum
d. the daytime is the longest |
|
Definition
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|
Term
Assume the STC max-power voltage of a crystalline silicon PV array is 68.4V. If the irradiance is 800 W/m2 and
the module temp is 50°C, assuming the inverter is tracking maximum power with a 1.6% voltage drop between
modules and inverter input, the inverter input voltage should be closest to ...
a. 47.1 VDC c. 54.7 VDC
b. 58.9 VDC d. 68.4 VDC |
|
Definition
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|
Term
A billboard uses 2000 Wh/day with a 12V system for lighting. The system requires 7-days of autonomy and the
batteries selected specify an 80% DOD. What is the system battery capacity required?
a. 1166.7 V c. 1458.3 Ah
b. 1166.7 Ah d. 1458.3 W |
|
Definition
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|
Term
Installers should always be aware that...
a. There is voltage in the inverter when the
pv array is in the sun
b. Panels connected in series make more
voltage than one panel
c. All of these are true
d. Some types of panel wires contain rodent
repellent & they should wash their hands
after handling |
|
Definition
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|
Term
The charge controller that simulates a variable charging current by switching a series element on and off at high
frequency and for variable lengths of time is the ...
a. diversionary charge controller c. series-interrupting PWM charge controller
b. MPPT charge controller d. series-linear charge controller |
|
Definition
|
|
Term
A 12-volt lead-acid battery has ...
a. 6 cells c. 12 cells
b. depends on the type of battery d. 2 cells |
|
Definition
|
|
Term
Of all the available alternative energy technologies in use today, which is the oldest?
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6
NAME: __________________________ _ DATE: -------
a. under-current c. over-current
b. over-voltage d. under-voltage |
|
Definition
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|
Term
9 Mitsubishi modules are configured in series strings of 3. Which best describes the output values?
52.
MITSUBISHI MODULE
Vpmax = 50 V
Ipmax = 4A
Voc = 52V
Isc = 5A
a. 156VDCI5A
b. 156VDCI15A
-""9-
~o 1 -;;:--.. -.-.-.. -.. -----.-.----"--.-' ---~ .. -~~. ~.-\ ::r ' |
|
Definition
|
|
Term
Which point represents the maximum power?
a. Point " A"
b. Point "B"
c. 150VDC/12A
d. 150VAC/4A
c. Point "C"
d. It cannot be determined from this graph |
|
Definition
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|
Term
. In July, a particular PV system is producing 50% of what it should have. The likely cause is ...
a. homeowner using too much power c. irradiance levels lower than normal
b. it was hotter than normal in July d. one of the combiner box fuses is blown |
|
Definition
|
|
Term
. Irradiance is a measure of solar power per unit of.. ..
a. time c. area
b. heat d. distance |
|
Definition
|
|
Term
What is the most common cause of voltage sag?
a. Use of solid conductors c. Conductor distance to main panel
b. Undersized inverter d. Inverter variance |
|
Definition
|
|
Term
Which of the following battery types require no electrolyte maintenance ...
a. Gel cell c. VRLA
b. all of these d. AGM |
|
Definition
|
|
Term
What color ladder would be appropriate for light commercial applications?
a. wood/aluminum c. greenlblue
b. black/white d. red/yellow |
|
Definition
|
|
Term
When one connects PV modules in series on a hot day ...
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NAME: __________________________ _ DATE: -------
b. shunt-interrupting charge controller d. series charge controller |
|
Definition
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|
Term
Charge controllers normally require adjustments for ...
a. max input power c. max input current
b. battery type d. voltage drop |
|
Definition
|
|
Term
What is a photon?
a. A component of a solar panel c. An element not used in PV
b. A basic unit of light energy d. A form of PV |
|
Definition
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|
Term
A hydrometer reading of 1.00 indicates
a. a VRLA battery c. a fully discharged battery
b. a fully charged battery d. a primary battery |
|
Definition
|
|
Term
. A concern with 12-V PV systems that use large wire sizes to minimize voltage drop is ...
a. the difficulty in obtaining DC-rated c. the possibility of using junction boxes or
disconnects with adequate current ratings switch boxes that are too small to house
the large wires
b. the possibility of animals chewing on the d. the difficulty in obtaining wire with DCwires
rated insulation |
|
Definition
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Term
If the inverter in a utility-interactive PV system begins to hum quietly about S minutes after closing the
connection to the utility, then it is most likely ...
a. connected to a motor load on the utility c. working
side
b. overloaded d. not working |
|
Definition
|
|
Term
When using a voltmeter, what is the first thing you should do?
a. Tum meter to "zero" c. Check condition of the leads
b. Put gloves on d. Tum meter to "off" |
|
Definition
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Term
A wire in a higher temperature location ...
a. can carry more current c. can carry less current
b. can carry less voltage d. can carry more voltage |
|
Definition
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|
Term
The critical design month is the worst case scenario where the load and the _____ ,are used to size the PV
system.
a. duty cycle c. insolation data
b. total power demand d. peak demand |
|
Definition
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|
Term
A transformer with a 1:2 turns ratio having 120VAC and 4A on its primary would have __ VAC and __ A
on its secondary.
a. 120VAC and O.SA c. 120VAC and 2A
b. 240V AC and 2A d. 240V AC and O.SA |
|
Definition
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|
Term
In the event that the utility voltage is lost in a utility-interactive system that has battery backup and an optional
standby system AC distribution panel, and if the inverter is programmed in the "sell" mode, the inverter should ...
a. not supply power to the terminals c. not supply power to the terminals
connected to the optional standby AC connected to utility point-of-connection
distribution panel
b. should no longer take DC power from the d. not supply power to either set of AC
batteries terminals |
|
Definition
|
|
Term
Assume a roof-mounted PV array is to consist of 2 source circuits of 4 modules each. Assume the drawings are to
scale and that the roofis large enough for any of the configurations shown. Which of these configurations can be
expected to result in the coolest operation of the modules? (Assume wind direction from west to east.)
a. d c. c
b. b d. a |
|
Definition
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|
Term
An array of Sharp modules is configured with a total of 8 panels, using series strings of 4. Which best describes
the output of the array?
SHARP MODULE
V pm ax = 43.2 volts
Ipmax = 4.6 amps
Voe = 51.4 volts
Ise = 5.2 amps
a. 205.6V / lOAA
b. I72.8V /4.6A
c. 345.6V /4.6A
d. I72.8V / 9.2A |
|
Definition
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|
Term
The minimum depth of the working space in front of a charge controller for which the input voltage never exceeds60 VDC is ...
a. 36" c. 30"
b. 42" d. negotiable |
|
Definition
|
|
Term
The newest type of charge controller that operates the array for optimum system performance under a range of
conditions is the ...
a. Series-interrupting PWM charge c. Shunt charge controller
controller
b. MPPT charge controller d. Diversionary charge controller |
|
Definition
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|
Term
Temporarily shorting the output terminals of a PV module will...
a. cause damage only if the module is c. have no effect on the module
connected in series with other modules
b. destroy the insulation on the module d. destroy the module if there is no PV
wiring if the short is not immediately breaker installed
cleared |
|
Definition
|
|
Term
The purpose of an inverter is to ...
a. convert AC at one voltage to DC at
another voltage
b. convert AC at one voltage to DC at the
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c. convert DC at one voltage to DC at
another voltage
d. convert DC at one voltage to AC at the
12 |
|
Definition
|
|
Term
. What is one of the factors that inhibit higher voltages in PV?
a. Increased irradiance c. Cold weather
b. Hot weather d. Cloud cover |
|
Definition
|
|
Term
The further north you are, the better it is to ...
a. increase your tilt angle c. decrease your azimuth
b. decrease your tilt angle d. wash your array |
|
Definition
|
|
Term
Which wires have the largest conductor and smallest conductor?
a. 4/0 6 c. 00 12
b. 2/0 4 d. 12 0000 |
|
Definition
|
|
Term
Ladders should extend above the structure for which it is used by ...
a. 3 ft. c. 4 ft.
b. 2 ft. d. As needed |
|
Definition
|
|
Term
A system has 8 of R EC modules configured in series strings of 4. Which best describes the output values?
RECMODULES
Voc = S3.8V
Vpmax = 4S.7V
Isc = S.IA
Ipmax= 4.8A
a. 215.2VIlO.2A
b. 182.8V/9.6W
c. 215.2V14.8A
d. 182.8V 14.8A |
|
Definition
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|
Term
If a proposed PV installation site has an unobstructed south-facing roof area of 80 square meters, and if thin-film
modules with 6W per square foot power output at STC are to be installed on 50% of the roof, then the maximum
available PV array output power at STC will be closest to ...
a. 4500 W c. 1960 W
b. 3600 W d. 2614 W |
|
Definition
|
|
Term
Which curve best represents a higher temperature & irradiance?
VOLTAGE (V)
a. curve "a" c. curve "c"
b. curve "b" d. None of these |
|
Definition
|
|
Term
Using the sun-path chart above, the minimum annual sun altitude between the hours of 8 a.m and 1 p.m sun time
is closest to ...
a. 400 c. 30°
b. 20° d. 10°
121. Modules connected in parallel increase ...
a. voltage c. current & total power
b. current d. voltage & total power |
|
Definition
|
|
Term
Which situation would provide a summer bias for a latitude of 44° north latitude where minimum ambient
temperature is _20° C?
a. Latitude + east declination of 14 °
b. Latitude + 10° higher tilt |
|
Definition
|
|
Term
What is the max power rating for the following module?
YINGLI MODULE a. the voltage that a conductor can carry
without exceeding its temperature rating
b. battery capacity
c. the number of modules that are used in
series in a system
d. the number of parallel module strings that
are used in a system
Vpmax = 50V
Ipmax = 4A
Voc = 52V
Isc = 5A
a. 200W
b. 200A
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c. 260W
d. 208W |
|
Definition
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|
Term
When specitying a grid-tied inverter the following parameter must be verified:
a. AC output watts, waveform type, battery c. output power, AC input voltage, DC
charge voltage, & frequency output voltage, harmonic distortion level
b. DC output watts, input voltage, output d. AC output watts, input voltage, output
voltage, & frequency voltage, & frequency |
|
Definition
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|
Term
If the maximum AC output rating of an inverter with 120VAC output is 1550W, the rating of the circuit breaker at
the utility point-of-connection should be ...
a. 20 A c. 25 A
b. 12.5A d. 15A |
|
Definition
|
|
Term
A 2500W inverter with an input voltage of22V to 32V has an efficiency of88% at full output. This means the
maximum inverter input current at full rating will be closest to ...
a. 69A c. 129A
b. 100 A d. 89 A |
|
Definition
|
|
Term
A circuit breaker performs the same function as ...
a. all of these
c. a switch
b. over-current protection d. a fuse |
|
Definition
|
|
Term
In order to provide adequate cooling, panels must be mounted ...
a. at latitude
b. a minimum of 3" above a roof
c. in a shady area
d. in "landscape" configuration
136. Irradiance proportionally affects ...
a. voltage c. NOCT
b. amperage d. air mass |
|
Definition
| b. a minimum of 3" above a roof |
|
|
Term
25 to 10 77 to 50 1.06
9 to 0 49 to 32 1.10
-1 to -10 31 to 14 1.13
-11 to -20 13 to-4 1.17
-21 to -40 -5 to -40 1.25
* from NEe Table 690-7
A crystalline silicon PV array that has bipolar outputs of +200V and -200V with a common grounded conductor
under STC is selected for a large single-family residence. The lowest ambient temperature in which the system
can be installed at a single-family dwelling is ...
a. -40°C c. -10°C
b. -20°C d. 0 °c |
|
Definition
|
|
Term
Equinox ...
a.is the same everyshere in the world at the same time
b. is always on the 21st.
c. means the sun is directly overhead at the tropic of Capricorn
d. happens once a year |
|
Definition
|
|
Term
The most common inverters in use today are ...
a. square wave inverters with very low
harmonic distortion
b. modified square wave inverters
c. pulse-width modulation sine wave
inverters
d. frequency-regulated stand-alone inverters |
|
Definition
|
|
Term
If the maximum power voltage ofa crystalline silicon PV module is 17.1 Vat STC, then at 60°C (module temp)
and 1000 W/m2 incident on the module, the maximum power voltage of the module will be closest to ...
a. 20.1 V c. 14.1 V
b. 17.1 V d. 12.0 V |
|
Definition
|
|
Term
The NEC article dedicated to PV is ...
a. 690 c. not of these answers
b. 360 d. 720 |
|
Definition
|
|
Term
In a PV system, the purpose of grounding is to ...
a. draw lightning away from components c. Provide a means to disconnect & isolate
b. Permit current to flow in branch circuits
only |
|
Definition
|
|
Term
Which conductor has the lowest resistance?
a. 14 AWG
b. 8AWG
all source circuits
d. Prevent unwanted currents from flowing
through the system
c. 24AWG
d. OOOOAWG |
|
Definition
|
|
Term
A 4.2 kW stand-alone system operating at 48 volts will draw ...
a. 48 volts c. 87.5A
b. current depending on the latitude d. 4200A |
|
Definition
|
|
Term
Adding new batteries.to an older existing battery bank is ...
a. recommended as needed c. not advisable because it degrades
performance of the new batteries
b. only done with parallel batteries d. allowed only if Ah & capacity ratings
match the existing batteries |
|
Definition
|
|
Term
The charge controller battery temperature sensor should be connected to ...
a. the side of a battery between 2 batteries c. the side of the battery compartment
b. to bottom of any battery d. the top of a battery that is the end of the
row of batteries |
|
Definition
|
|
Term
. 90° C rated wire ...
a. has the same ampacity for all temperatures c.
under 90°C
is wire that should never get hotter than
90° C if you did everything right
b. is not used in PV systems d. is always black |
|
Definition
|
|
Term
The first step in designing an off-grid system is to ...
a. detennine the customer's budget c. detennine the load requirements
b. locate the utility disconnect d. detennine battery requirements |
|
Definition
|
|
Term
Who is credited with the discovery of the "photovoltaic effect"?
a. Edmund Becquerel
b. Alessandro Volta |
|
Definition
|
|
Term
Linear current boosters ...
a. are commonly used in direct pumping
applications
b. are commonly used in grid-tied systems
c. Albert Einstein
d. Buckminster Fuller
c. don't work well in the morning
d. decrease ohms per kilo-feet in wire sizing
applications |
|
Definition
|
|
Term
a. 1= 0.5VR
b. I=VR
PARAMETER
Watts STC
Watts PTe
Voc
Vpmax
Isc
Ipmax
Series fuse rating (amps)
Max system voltage
Dimensions - L x W x D (in.) |
|
Definition
|
|
Term
If V = IR then
c. IR=A
d. VII =R |
|
Definition
|
|
Term
A 4 k W (STC) crystalline silicon PV array is operated in a utility-interactive mode with no battery backup. The
inverter tracks maximum power & the array is operating at 50°C with a 900 W/sq. m. incident on the array.
There is a 2% power loss in the wiring & the inverter efficiency is 94%. On a typical PV system the inverter
output will be closest to ...
a. 2.6 kW c. 2985 W
b. 1492 W d. 3.3 kW
181. What is 1 horsepower?
a. 1.27 Langleys c. 746 W
b. lkWh d. 1250 Joules |
|
Definition
|
|
Term
a. you have to increase the wire size
b. you should increase the amperage by
120%
c. you increase the voltage drop percentage
d. you decrease the voltage drop percentage |
|
Definition
|
|
Term
An insolation measurement takes into account these factors:
a. solar power, unit area c. solar energy, unit area
b. solar power, time, area d. solar efficiency, unit area |
|
Definition
|
|
Term
Which applications represent small stand-alone PV direct motor applications
a. Cattle fence & cell phone tower c. Electric scooter & solar calculator
b. Anti-icing bubbler & remote light d. Water trough pump & fly fan |
|
Definition
|
|
Term
A series string of 8 panels producing 36V each at 6A with an insolation of7 hrs. will produce ...
a. 12.1 kWh c. 12.96 kWh
b. 288 watts d. 1.7 kWh |
|
Definition
|
|
Term
A PV array with 4 series strings, each outputting 350VDC @ 5A is paralled in a fused combiner box.
The fuses should be rated at. ..
a. 20 A c. 6.25 A
b. 8 A d. 350 VDC |
|
Definition
|
|
Term
. Is the open circuit voltage of a crystalline silicon PV array is 315 Vat 25°Cl then, according to NEC Table 690-7
found on question # 124, if the array is operated at -20°C, maximum system voltage must be corrected to ...
a. 369 V c. 315 V
b. 269 V d. 394 V |
|
Definition
|
|
Term
Utility disconnection is done in this order ...
a. PV, charge controller, battery, inverter, c. PV, DC disconnect, AC disconnect,
grid inverter, grid
b. PV, charge controller, battery, main panel, d. PV, inverter, meter, breaker
inverter |
|
Definition
|
|
Term
What is the azimuth of the sun relative to true north at solar noon in Billings, Montana on April 1st?
a. 180°
b. 90°
c. 0°
d. 56°C |
|
Definition
|
|
Term
A 2500-W inverter is used to supply a 120 V AC load of 1500-W. This means that the ampacity of the wire at the
inverter output must be at least...
0' / pry AC-"fICE -rE· sv-r \ ,0 d 1 \ _ l '-1 . ~ . ,1 v./ . OC
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from the vertical line from the ground to
where the ladder touches the roof
b. The horizontal distance should be 114 the
distance ofthe vertical line measured from
the ground to where the ladder touches the
roof
d. While standing straight in front of the
ladder with feet touching the bottom of the
ladder, you should be at arm's length from
the rails |
|
Definition
|
|
Term
After analyzing a particular system design that utilized 10 A WG copper conductors, an engineer calculated the
voltage drop to be not acceptable. To remedy the problem, it was suggested that the system ...
a. use 12 A WG aluminum conductors c. use 8 A WG copper conductors
b. use 12 A WG copper conductors d. use a larger inverter |
|
Definition
|
|
Term
Irradiance is ...
a. irradiation multiplied by time c. measured in watts per square meter
b. measured in sun-hours per day d. measured in watts |
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Term
Popular adoption of residential PV is due in part to the development of...
a. Advancement in battery technology c. Thin Film Technology
b. Pure sine-wave inverters d. Controllers |
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Term
The current-carrying ability ofa wire is referred to as ...
a. ampacity c. capacity
b. wire gauge d. resistance |
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An array of Evergreen modules is configured with a total of 8 panels, using series strings of 4. Which best
describes the output values?
EVEGREEN MODULE
Vpmax = 43.2 volts
Ipmax = 4.6 amps
Voc = 51.4 volts
Isc = 5.2 amps
a. 205.6V /4.6 A
b. In.8V / 4.6A
c. 345.6volts /4.6 amps
d. 205.6 V 110A A |
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Term
On a certain PV system installed in a location with an ambient temperature of 34°C, a 3/4" conduit laying on the
rooftop will contain 4 "USE" 90 °C-rated conductors, each carrying 20A. The derating factor for 4-6 conductors
in a conduit is 80%. The ampacity correction factor for an ambient temp of 34°C with the ambient temp
adjustment adder of 33°C is 0.58. What current should the conductors be sized for?
a. 20A c. 25A
b. 24A d. 43A |
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Term
A common mistake in grid-tie system design is ...
a. disregarding module specifications c. over-sizing the inverter
b. using 12" conduit d. overlooking shading from vegetation growth |
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Term
. Where is the GFCI located in a PV system?
a. in the inverterc. in the charge controller since the GFCl's are only
required in battery systems
d. between the inverter & the AC disconnect
b. between the DC disconnect & the
inverter |
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Term
A PV system in Connecticut has 4 days of consecutive & consistently lower-than-normal irradiance
levels. The module temperature is remotely monitored and appears to be far below normal levels.
The likely cause is ...
a. the system pyranometer is bad c. there is snow deposited on the modules
b. there is excess cloud coverage d. the modules cannot handle the system voltage |
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Term
Assuming the same PV system at the same temperature conditions, more power would be provided at ...
a. sea level c. a coastal area
b. 1O,OOO-ft. elevation d. a windy valley |
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Term
Wire ampacity is determined from ...
a. the molecular structure of copper c. ampacity charts
b. the amount of system voltage d. the length & cross-sectional area |
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Term
The hydraulic analogy of voltage is ...
a. flow
b. pressure
c. density
d. volume |
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