SOLAR PV PRACTICE TEST
The inverter went over voltage in Kalamazoo one cold winter. The warranty was voided
and the installer was responsible for buying the new inverter. The maximum input
voltage of the inverter was 1000V. The PV module specifications at STC were: power =
245W, Vmp = 30.1V, Imp = 8.2A, Voc = 37.7V, Isc = 8.7A. The temperature coefficient
for the panel was -0.121. There were 24 modules per PV source circuit. How cold did it
get when the inverter got to be 1000V dc? - Correct Answers --8C
Which type of PV system can dissimilar PV module types be used with little or no
system loss? - Correct Answers -A system that uses Ac PV modules that are coupled
only to the Ac system
Which of the following is MOST often overlooked when analyzing the lifecycle costs of a
PV system? - Correct Answers -Interest rates on financing loans
Which is the best way to determine the state of charge of a typical flooded lead acid
battery? - Correct Answers -Hydrometer testing
Which of the following is true regarding a grid-tied battery backup system? - Correct
Answers -It provides power when there is a grid outage
Wiring solar panel in series___. - Correct Answers -Does not affect the amperage but
increases the voltage
The peak sun hours for a site receiving 1,000 W/m2 for two hours and 600 W/m2 for 5
hours is___. - Correct Answers -5 hours
A 80 Ah battery from which 32 Ah have been withdrawn has undergone a DOD of ____.
- Correct Answers -40 percent
For maximum power out in winter in the northern hemisphere, the tilt angle should
equal____. - Correct Answers -Local latitude +15 degrees
What is the maximum possible system voltage for a PV system that has 5 modules in
series, Voc of 30V, with a voltage correction factor of 1.10. - Correct Answers -165
Which of the following is continually monitored by an automatic transfer switch? -
Correct Answers -Primary power source
, What is the minimum working clearance around the inverter? - Correct Answers -36 in.
directly in front, 30 in. side to side, and 80 in. of height
What is the MINIMUM number of modules that you can put in series for proper
performance with a high solar cell temperature of 65 degrees, a Vmp of 31V, a
temperature coefficient of -0.45%/C and inverter voltage of 215V? - Correct Answers -9
A 16A interactive inverter output circuit will require a circuit breaker of how many amps?
- Correct Answers -20A
Of the following, which is worst for stand-alone lead-acid batteries? - Correct Answers -
Undersized PV array
What is a standalone PV system considered under NEC labeling requirements? -
Correct Answers -Power source
What is the OSHA - regulated MAXIMUM distance to an eyewash station when working
on flooded lead-acid batteries? - Correct Answers -25 ft
The temperature rating of the insulation of a conductor when designing a PV system
effects the____. - Correct Answers -ability of the wire to carry current
Which is the best and safest way to determine current in a PV output circuit? - Correct
Answers -Clamp on ammeter
A remote cabin uses the loads below per day, 1000W toaster for 6 minutes, 1.2 kw hot
water heating element for 3 hours, 3 17W LED lights for 3 hours per day, phone charger
at 20W for 3 hours per day, how much total energy is used per day? - Correct Answers -
3.9 kWh
What is the largest array size if you are using a 24V battery bank and 20A charge
controller? - Correct Answers -280W
What is the MAXIMUM number of modules in series given that Voc = 44V, Vmp = 38V,
cold temperature = -22, Temperature coefficient Voc = -0.3%/C, Inverter Maximum input
voltage = 550V? - Correct Answers -10
A 50 kw interactive PV system has 15% system losses in a location getting 5.4 peak
sun hours per day average throughout the year. What would be the expected annual
energy putout? - Correct Answers -83,768 kWh
What is the highest angle which the sun can be anywhere in the world? - Correct
Answers -90 degrees
When sizing a stand-alone PV system, we often have to consider the critical design
month, which would have the - Correct Answers -Worst insolation and most load usage
The inverter went over voltage in Kalamazoo one cold winter. The warranty was voided
and the installer was responsible for buying the new inverter. The maximum input
voltage of the inverter was 1000V. The PV module specifications at STC were: power =
245W, Vmp = 30.1V, Imp = 8.2A, Voc = 37.7V, Isc = 8.7A. The temperature coefficient
for the panel was -0.121. There were 24 modules per PV source circuit. How cold did it
get when the inverter got to be 1000V dc? - Correct Answers --8C
Which type of PV system can dissimilar PV module types be used with little or no
system loss? - Correct Answers -A system that uses Ac PV modules that are coupled
only to the Ac system
Which of the following is MOST often overlooked when analyzing the lifecycle costs of a
PV system? - Correct Answers -Interest rates on financing loans
Which is the best way to determine the state of charge of a typical flooded lead acid
battery? - Correct Answers -Hydrometer testing
Which of the following is true regarding a grid-tied battery backup system? - Correct
Answers -It provides power when there is a grid outage
Wiring solar panel in series___. - Correct Answers -Does not affect the amperage but
increases the voltage
The peak sun hours for a site receiving 1,000 W/m2 for two hours and 600 W/m2 for 5
hours is___. - Correct Answers -5 hours
A 80 Ah battery from which 32 Ah have been withdrawn has undergone a DOD of ____.
- Correct Answers -40 percent
For maximum power out in winter in the northern hemisphere, the tilt angle should
equal____. - Correct Answers -Local latitude +15 degrees
What is the maximum possible system voltage for a PV system that has 5 modules in
series, Voc of 30V, with a voltage correction factor of 1.10. - Correct Answers -165
Which of the following is continually monitored by an automatic transfer switch? -
Correct Answers -Primary power source
, What is the minimum working clearance around the inverter? - Correct Answers -36 in.
directly in front, 30 in. side to side, and 80 in. of height
What is the MINIMUM number of modules that you can put in series for proper
performance with a high solar cell temperature of 65 degrees, a Vmp of 31V, a
temperature coefficient of -0.45%/C and inverter voltage of 215V? - Correct Answers -9
A 16A interactive inverter output circuit will require a circuit breaker of how many amps?
- Correct Answers -20A
Of the following, which is worst for stand-alone lead-acid batteries? - Correct Answers -
Undersized PV array
What is a standalone PV system considered under NEC labeling requirements? -
Correct Answers -Power source
What is the OSHA - regulated MAXIMUM distance to an eyewash station when working
on flooded lead-acid batteries? - Correct Answers -25 ft
The temperature rating of the insulation of a conductor when designing a PV system
effects the____. - Correct Answers -ability of the wire to carry current
Which is the best and safest way to determine current in a PV output circuit? - Correct
Answers -Clamp on ammeter
A remote cabin uses the loads below per day, 1000W toaster for 6 minutes, 1.2 kw hot
water heating element for 3 hours, 3 17W LED lights for 3 hours per day, phone charger
at 20W for 3 hours per day, how much total energy is used per day? - Correct Answers -
3.9 kWh
What is the largest array size if you are using a 24V battery bank and 20A charge
controller? - Correct Answers -280W
What is the MAXIMUM number of modules in series given that Voc = 44V, Vmp = 38V,
cold temperature = -22, Temperature coefficient Voc = -0.3%/C, Inverter Maximum input
voltage = 550V? - Correct Answers -10
A 50 kw interactive PV system has 15% system losses in a location getting 5.4 peak
sun hours per day average throughout the year. What would be the expected annual
energy putout? - Correct Answers -83,768 kWh
What is the highest angle which the sun can be anywhere in the world? - Correct
Answers -90 degrees
When sizing a stand-alone PV system, we often have to consider the critical design
month, which would have the - Correct Answers -Worst insolation and most load usage
