WorksheetsSOLAR MOD. 9: System Sizing
Total questions: 10
Worksheet time: 5mins
If a stand-alone system is not sized correctly, what happens?
Nothing
Power can go out early into the night
Batteries are damaged
Current goes out but voltage continues at night
Would you do a load analysis for a grid-tied system?
Yes, if you needed to downsize the main breaker
No, you can always use the utility bill
Yes, if the utility company asks you to do so
Doesn't really matter if you do or not
Assume a system derating factor 0.82. If you need 4kW of AC, what size should your array be?
4000 W
4.9 kW
3.3 kW
5.6 kW
For a critical design analysis, what would you compare?
how critical the design was to the house
peak sun hours and number of loads
irradiance and Wh needed per month
Insolation and Wh needed per month
Why would you typically not design a 12V stand-alone system for a residence?
If you needed more power
To keep conductor AWG reasonable
To add more solar panels
To keep conductor sizes large
For a typical PV battery bank using lead-acid batteries, the allowable depth-of-discharge should be...
0.80
23.5 degrees
equal to the latitude
the same as the tilt angle
1. Similar to PV panels, batteries are configured in __________ and __________ in order to get the desired voltage and current for the system.
positive and negative
60 and 72
current and voltage
series and parallel
The best way to size a grid-tied system is to calculate a home’s power usage by looking at the...
home owners
load capacity
utility bill
utility meter for 10 minute then multiply by 6
1. In designing a system, one also has to look at the _________ and __________ voltages of the inverter.
minimum and maximum
current and high
brand and input
warranty and average
What weather factors need to be considered in designing a system so that the system stays within the operating range of the inverter?
Latitude of the area of the install
Maximum speed of seasonal winds
Historical high & low temps in the area of the install
Weather factors don't really matter
