Deck 10: Sizing Pv Systems

Question 1

The duty cycle is the amount of time that a specific electrical load operates.

Answer 1

True

Question 2

Sizing the wire from the inverter to the AC loadcenter in a grid-tie PV system is sized the same way as sizing the wire run from a(n) ___________________ to an AC loadcenter in a stand-alone PV system.

Answer 2

inverter

Question 3

In a standard charge controller, all of the system components have the same voltage.

Answer 3

True

Question 4

Explain how output power rating is used to determine the number of inverters needed in a grid-tie PV system.

Question 5

Load ____________________ is the process of changing large electrical loads in a building to another form of power such as natural gas or propane.

Question 6

Explain the Energy Star label, where it originated, and what it means.

Question 7

Sizing a(n) ____________________ PV system is simpler than sizing a stand-alone PV system primarily because there are not as many system components to determine.

Question 8

Where do you start when sizing a PV system?

Question 9

What is the overall process for determining inverter size for a stand-alone PV system?

Question 10

The use of an MPPT and/or step down charge controller in a stand-alone PV system requires the array to be sized a little differently than when using a(n) ____________________ charge controller.

Question 11

For the lowest temperature termination rating, assume that all terminations are rated ___________________°C unless you know for sure that there are 60°C or 90°C terminations in the circuit.

Question 12

Why should a grid-tie PV system not be sized larger than needed for the building's average annual electrical load?

Question 13

The ____________________ electric energy usage can be found on a building's electric utility bill, or the building owner can contact the local electric utility.

Question 14

A(n) ____________________ PV system needs to be sized so that it can supply the total electrical load of the building it serves.

Question 15

The rule of thumb often used to calculate the surge load is to simply multiply the required watts of a load by ____________________.

Question 16

A phantom load is a load type that draws a large amount of current, even when the load is "OFF".

Question 17

If the building's loads change significantly over the course of a year, it is acceptable to use the month with lowest insolation as the design month.

Question 18

What is the one major difference between a bimodal PV system and a stand-alone PV system?

Question 19

A common assumption in most stand-alone PV system installations is that the wiring from module to module and from the array modules to the combiner box is the same size as the wire leads that were installed on the PV modules by the manufacturer.

Question 20

The system loss ___________________ factor takes into account the types of losses that occur when converting the PV array produced DC electricity to AC electricity.