Topic: Photovoltaic systems load calculations. component selection

PV systems Integration powerpoint

Load Calculations spreadsheet:
Load calculations.pdf

by page in .jpg
Load analysis page 38
Load analysis page 39
Load analysis page 40
Load chart page 41
Load analysis page 42
Load analysis page 43
Load analysis page 44

Blank load chart for MAC (excel worksheet)
Blank load chart for PC (excel worksheet)

Inverter Size: Peak KW determines the inverter size. Keep in mind you will never run everything at once. Use a good guess, and often it comes down to what you can afford.
<2500W = 12V
>2500W = 24V or 48V
>4000W = 48V

PV Panels: Average KWH/day = PV panel array size x hours/day of sunlight (Use 4.3 hrs.)
or Average KWH/day / 4.3 = PV array size
example:
10KWH/day /4.3hrs = 2326W
2326 KW~2500W of PV panels would be 25 100watt panels. (about $12,500)

Charge Controller:
First determine voltage by inverter size.
Divide PV Panel wattage by voltage to get current
example:
10KW = 10,000W/24V = 416 amps
Find one or more controllers to handle 416 amps

Batteries: AVE KWH/day x days of storage = size of battery bank
10KWH/day x 3days of storage = 30KWH storage needed
Example: using 12V 105AH batteries = 1260 WH or 1.26KWH
30/1.26 = 24 batteries
or 30KWH = 30,000 WH
30,000WH/12V = 2500amp-hours
2500/105AH = 24 batteries
NOTE: TRY TO AVOID WIRING BATTERIES IN PARALLEL
Use 2V or 6V batteries in single string. No 12V batteries in RE systems.

After doing this you can see the benefit of reducing your needs. Electric driers aren't recommended unless you have stock in electric utility.

HOMEWORK for Nov. 22

1) LOAD CALCULATION FOR YOUR BUILDING
2) Prepare a presentation by group on photovoltaic system components: panels (single crystal, poly/multi crystal, thin film/amorphous), inverters, controllers, batteries, trackers.
Please explain the technology and list all the companies that make them and comparison between competing products.