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Shade Measurement Overview
- 1. Shade Measurement Topics Who is Solmetric? Why measure shade? Important terms and concepts The Solmetric SunEye Resources for more information
- 2. Founded in 2005 Headquarters in Sebastopol, CA Mission: Improve the effectiveness of solar systems and those who install them by providing high quality, easy-to-use, accurate tools with embedded technical know-how. Solmetric Corporation
- 4. Why measure shade? Choose optimum location for panels Predict energy production accurately Ensure optimum financials Shading has a disproportionate impact on energy production
- 5. What’s Happening Electrically? Photovoltaic I-V Curve Current Voltage Isc Voc Max power point Vmp Imp I-V curve
- 6. Array of Cells, Cell Strings or Modules
- 7. PV Module with Bypass Diodes Typical 72-cell PV Module (bypass diodes shown) +
- 8. Shade 2 cells in the same cell-string Single module with 72 cells and 3 bypass diodes
- 9. Shade 2 cells in adjacent cell-strings Single module with 72 cells and 3 bypass diodes
- 10. Shade Effects Example: 1 Business Card on a string of 15 modules
- 12. Solar Resource Terms Insolation: Solar Energy over time per unit area in kWh/m 2 Solar Access: % insolation available compared to no shading Tilt and Orientation Factor (TOF): % insolation available at actual panel orientation compared to optimum orientation Total Solar Resource Fraction (TSRF): % insolation available, accounting for both shading and orientation (TOF) TSRF = Solar Access x TOF
- 13. Insolation – Solar energy over time per unit area in kWh/m 2 1 kW/m 2 of irradiance for 6 hours: = 1 kW/m 2 x 6 hr = 6 kWh/m 2 of insolation Irradiance: incident solar radiation per unit area ≈ 1000 W/m 2 (1kW/m 2 ) at earth’s surface
- 15. Sun Trajectories Summer Winter Noon Sunrise Sunset
- 16. Annual Sunpath
- 17. Horizon View SunPath View Solar Access
- 18. Solar Resource Terms Optimum Annual Insolation TOF TSRF Solar Access Loss due to sub-optimal tilt/azimuth Loss due to shading
- 19. Solar Resource Example Optimum Annual Insolation TOF TSRF Solar Access Loss due to sub-optimal tilt/azimuth Loss due to shading
- 20. Solmetric SunEye Electronic hand-held tool that measures solar access and shading with the press of a button.
- 21. Solmetric SunEye 100 Series Introduced in 2006 Established new standard in shade measurements No longer in production Model 210 Introduced in Feb 2010 Integrated design GPS option
- 22. Operating the SunEye 1) Create a Session Create a new session for each site visit Enter a name and a location 2) Capture Skylines Enter panel azimuth and tilt - Make multiple measurements
- 23. Capturing Skylines A) Point South B) Hold Level C) Press “Snap” Site Survey Mode Capture a skyline… Every 10 to 15 feet At the height of a module At the corners of the design area At worst case scenario locations
- 24. Annual Sunpath View View Solar Access View TOF & TSRF
- 25. Editing a Skyline Simulate… Tree trimming Tree removal Tree growth New building construction
- 26. Monthly Solar Access Single Skyline Session Average
- 28. SunEye GPS Add-On Integrated internally on SunEye 210 Automatic Session location Records location of each skyline Reports include file for Google Earth™
- 29. SunEye Extension Kit Trigger measurements by rotating the pole Automatic correction for azimuth and tilt Ready for the next measurement in a few seconds Make measurements up to 18ft from the ground
- 30. Transfer data to computer via USB View the data in the same forms as the device Easier skyline editing Share Sessions with colleagues Create reports Export files to design tools Launch Solmetric PV Designer
- 31. Solar Access and Shade Report
- 32. Shade adjusted PV design
- 34. Compare Designs
- 35. For more information… Visit our website: Product details Training videos Free webinars Free online tools Search our knowledge base Call or email Email: [email_address] Phone: (707) 823-4600 Toll-free: 1-877-263-5026
Editor's Notes
- #21: The SunEye is engineered for simplicity. A compass and bubble level are built-in. Just point toward the south, hold it level, and press the button. The “Skyline” is captured and ready for analysis.
- #22: This part of the presentation will show how the Solmetric SunEye is making shade analysis easy for solar energy and green building professionals.