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Analyzing the School's Solar Energy System

posted Apr 11, 2016, 10:41 AM by Tony Farley   [ updated Apr 14, 2016, 12:44 PM ]
You will be looking at SLHS's solar energy systems today. Answer the questions on this document as you follow the directions.

Go to

Login with Username
and Password: I'll tell you what it is.

You will see this when you login

1. You will see that we can monitor SLHS's solar system as well as John Muir's. How much energy was created today by each system?

2. Double-click San Leandro or click it and then click "Open in new window."  At the top right, you will see the Power coming from the system right now, today's total power, Temp, Wind speed, and Irradiance. 

What is your reading for all of these for when you logged on?

3. What does kW stand for? (don't just answer kilowatt-hour. Explain what a kilowatt-hour is.)
4. What does kWh stand for?
5. What does Irradiance mean?
6. What does W/m2 mean?

7. Reload the page. What has changed with date, time, Power, Today, This month, temp, wind, irradiance?

8. The next part of the screen shows you the power generation and energy production by each inverter. Find out what an inverter is and explain it.

9. The first column of data is Inverter SN. This stands for Inverter Serial Number. Each inverter has a serial number on it's side. The one pictured is 191212519 Here is a picture of one of the inverters along with a picture of its serial number.

Find the inverter pictured and list what it's Nameplate Capacity is, its peak power generation today, its energy production today, and its lifetime energy production is.

10. Next is the graph area.

The top right has tabs that will show one day of data (1d), 3 days (3d), all the way up to a year. Take a screenshot of the last seven days of data.

11. Placing the mouse pointer over a data point in the graph will show you the information being plotted. Find the date and time for the maximum power produced. What was the maximum power produced?
12. You can change what's graphed by using the drop down menus on the left. The colored text shows what is being graphed and if you select something and hit "graph now" it will be added to the graph. Look at today's (1d) Interval Energy Produced and delete everything else.

Screenshot the graph and describe what happened between 9am and noon. What could have caused this?

13. Find MET Station ACP2407 and select Avg POA Irradiance (W/m2) and add this to the graph. Find out what a MET station is and explain what this is showing.

14. Screenshot your graph and explain what is being shown and why it's happening.

15. Add Ambient Temperature to your graph, switch to viewing the last seven days, and take a screenshot of the graph.

16. You can also download the data to analyze yourself. Click the button on the right that says downloads and download the .CSV file.
What does .CSV stand for?

18. Open your .CSV with Sheets by opening a sheet and then File > Import. Be sure to check the box that says it is Comma Separated (.CSV remember?). Select all the data and create a graph. Take a screenshot of the graph and put it in your document.

Turn your document in by filling out this form.