Battery Lab

Laboratory Activity-Batteries

Load  Off-grid solar power systems (Links to an external site.) :

Part 1:

· Watch the Video. https://www.youtube.com/watch?v=P2XSbDRi6wo (Links to an external site.) 

Part 2:

· Scroll to the section titled “Designing/sizing an off-grid solar power system”

Step 1 : Work out your power needs

· Refer to your electric bill and determine your power needs. The electric bill should include a Kwh/day or Kwh/month rating. Convert to watt-hours/day and move on to  step 2.   Only use the spreadsheet if you do not have access to your electric bill.

Step 2 : Sizing Battery Bank

Determine the capacity of the needed battery bank in Amp-Hours for each of the nine (9) scenarios listed below.  Include  three different bar graphs in your Lab Report. One for each group of scenarios (e.g., Days without Sun, Depth of Discharge, Temperature) plotting the Amp-Hours.

· Days without Sun scenarios:

Sun #1	Sun #2	Sun #3
Insert Wh/day from part 1	Insert Wh/day from part 1	Insert Wh/day from part 1
Battery Bank Voltage: 12	Battery Bank Voltage: 12	Battery Bank Voltage: 12
Days without Sun: 2	Days without Sun: 3	Days without Sun: 5
Depth of Discharge: 50	Depth of Discharge: 50	Depth of Discharge: 50
Temperature Multiplier: 1.04	Temperature Multiplier: 1.04	Temperature Multiplier: 1.04
Amp-Hours????	Amp-Hours????	Amp-Hours????

· Depth of Discharge scenarios:

DoD #1	DoD #2	DoD #3
Insert Wh/day from part 1	Insert Wh/day from part 1	Insert Wh/day from part 1
Battery Bank Voltage: 12	Battery Bank Voltage: 12	Battery Bank Voltage: 12
Days without Sun: 3	Days without Sun: 3	Days without Sun: 3
Depth of Discharge:20	Depth of Discharge:45	Depth of Discharge:70
Temperature Multiplier:1.04	Temperature Multiplier:1.04	Temperature Multiplier:1.04
Amp-Hours????	Amp-Hours????	Amp-Hours????

· Temperature multiplier scenarios:

Temp #1	Temp #2	Temp #3
Insert Wh/day from part 1	Insert Wh/day from part 1	Insert Wh/day from part 1
Battery Bank Voltage: 12	Battery Bank Voltage: 12	Battery Bank Voltage: 12
Days without Sun: 3	Days without Sun: 3	Days without Sun: 3
Depth of Discharge: 50	Depth of Discharge: 50	Depth of Discharge: 50
Temperature Multiplier:1.00	Temperature Multiplier:1.19	Temperature Multiplier:1.59
Amp-Hours????	Amp-Hours????	Amp-Hours????

 

***Discuss the results in your lab report.***

 

Batteries Group Discussion Questions

 Use these questions to guide your data summary.  Please do not just  answer the questions numerically 

1. What is a lead-acid battery and how does it work?

2. What are the most widely used types of batteries for solar and/or backup systems?

3. What is the difference between connecting in parallel and series strings of wiring?

4. How does depth of discharge influence the capacity of the needed battery bank?

5. How does weather influence the capacity of the needed battery bank?

6. How does the location of battery storage (e.g., temperature controlled or outside) influence the capacity of the needed battery bank?

7. Discuss some practical ways you can reduce the capacity of the needed battery bank if you were living in an off-the-grid scenarios.  Remember you entered the Watt hours needed based on your current energy usage.

8. How does this laboratory exercise fit within the context of our environmental science and sustainability course?

 

 

 

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