1. Red Rocks Community College ENY 130 Fall 2009 Module 3: Solar Resource

2. The Solar Resource

3. Where/when does the sun shine?

4. Summer Solstice (June 21)

5. December 21

6. Longitude and Latitude

7. Where are we? (March,Sept 21)

8. Another view…. During Equinox’s

9. Azimuth / Altitude (height) Source: NOAA

10. Solar Path

11. Window

12. Sun Path Chart

13. Determine Your Solar Window

14. Sun site selector

15. Solar site selector

16. Wiley - Asset

17. Solmetric Sun Eye

18. A Solar Pathfinder

19. Using the Pathfinder

20. Under the dome….

21. Can also be done wrong

22. Magnetic Declination

23. Mag Dec and direction

24. World Magnetic Declination

25. Best tilt angle for panels?

26. Denver Solar Data (Insolation) MonthJanFebMarAprMayJunJulAugSepOctNovDecAvg. kWh/sq meter/day 5.075.546.806.656.696.676.846.667.06.55.04.86.20 kWh/sq ft / day.185.203.249.243.245.244.250.244.26.24.19.18.227 Btu / sq ft/ day 1700

27. Orientation and tilt Efficiency

28. What are our numbers? Denver Latitude? Panel tilt for winter gain Panel tilt for year around Panel tilt for summer Why tilt for summer here in Denver? Why tilt for electricity in winter?

29. Watts per square meter

30. Where does the light go? Source: NREL

31. Distance through atmosphere matters

32. Direct Light vs. Tilt

33. Insolation

34. Insolation around the world

35. Site Assesments Tools for site evaluation Compass Solar Access finder Digital Camera Tape Measure Protractor Note Pad Ladder Pencil/Pen

36. Conducting a Site Assessment Observing proposed panel locations Establish location of electrical equipment Roof or site orientation Shading problems Conduct solar assessment (Pathfinder) Fill out form

37. Using the Solar Pathfinder Set up in proposed location of panels Orient for true south Level the unit Take digital picture above level bubble and about 15” above dome (higher with zoom) Download picture into computer Start Pathfinder software and follow directions

38. Using the Pathfinder

39. Pathfinder results