PV System Sizing Principles Flashcards
Use this deck to learn about all of the PV system sizing aspects of a PV system installation.
A crystalline silicon PV array that has bipolar outputs of +252V and -252V with a common grounded conductor under STC is selected for a large single-family residence. For this system, if the maximum system voltage is close to 605V, what is the lowest expected temperature at the installation site?
-25 degrees Fahrenheit
Subpart E of OSHA PART 1926 describes regulations regarding…
OSHA Rules for personal protection and life-saving equipment
What should be connected on the side of a battery between two batteries?
The charge controller battery temperature sensor
What does a transformer do?
Transforms radio waveforms in frequency applications; transforms amperage; transforms voltage, and/or transforms current
System availability is the percentage of what?
Average time percentage per year a stand-alone PV system meets its load requirements
Are 110 volts, 120 volts, and 240 volts, two phase?
No
True or False: Ohm’s law states that an increase in current is inversely proportional to an increase in voltage.
FALSE
Ampacity is determined by what?
Wire width
What are the only inverters that have low harmonic distortion?
Sine waves inverters, since they are required for connection to utility lines
What electrical property increases on a hot day?
Voltage drop
If a cold front moves in, what will increase?
The voltage of a PV system
Where are the OSHA Rules for personal protection and life-saving equipment found in OSHA PART 1926?
Subpart E
If the output of the inverter is connected to the optional standby system panel through a 30 A circuit breaker, what is the appropriate size of the equipment grounding conductor between the inverter and the emergency panel?
10 AWG copper
What starts at the load size and ends at the array?
System sizing
According to the NEC, if flooded lead-acid batteries are selected for energy storage for a PV system, the battery enclosure must have what?
Provisions for sufficient diffusion and ventilation of the gases from the battery to prevent the accumulation of an explosive mixture, and if a tray is used it shall be resistant to deteriorating action by the electrolyte.