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8/9/2019 Shade Measurements Aug 2010
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Solar Site Evaluation
Tips and Techniques
Peter Hoberg
VP Sales and Marketing
Solmetric Corporation
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Shade Measurement Topics
• Site analysis considerations – Why measure shade?
– Terminology
– Shade measurement strategies
• Using the SunEye
– Live demo
– Common problems and solutions
– State rebate requirements• Resources, Questions and Answers
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• Founded in 2005• 25 employees• Headquarters in Sebastopol, CA• Mission: to improve the effectiveness of solar systems
and those who install them by providing high quality,easy-to-use, accurate tools with embedded technicalknow-how.
Solmetric Corporation
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Solmetric Solutions
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Why measure shade?
• Choose optimum location for panels
• Identify issues early in the process
• Predict energy production accurately
• Ensure optimum financials – State rebate
– Feed in tariff
– Renewable Energy Credits
Note: Shading can have disproportionate
impact on energy production
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Hemisphere view (Skyline)
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Irradiance
Incident solar radiation (power) per unitarea in kW/m2
Approximately 1 kW/m2 at the earth’ssurface.
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San Diego insolation
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Azimuth and tilt
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Roof Azimuth Tool
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Solmetric Compound Angle Tool
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Solar Resource Terms
• Insolation. Incident Solar Radiation, kWh/m2
• Solar Access. Insolation compared to no shading, in field of view of the panel.
• Tilt and Orientation Factor (TOF). TOF is the solar insolationat the actual tilt and orientation divided by the insolation atthe optimum tilt and orientation, expressed in percent.
• Total Solar Resource Fraction (TSRF). TSRF is the ratio of insolation available accounting for both shading and TOF,compared to the total insolation available at a given location
at the optimum tilt and orientation and with no shading.TSRF is also expressed in percent, according to the followingequation: TSRF = Solar Access * TOF.
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Solar Resource Terms
Optimum AnnualInsolation
TOF
TSRF
Solar Access Loss due to sub-optimal tilt/azimuth
Loss due toshading
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Solar Resource Example
Optimum AnnualInsolation
TOF
TSRF
SolarAccess
Loss due to sub-optimal tilt/azimuth
Loss due toshading
Good Solar Accessmeans little shade,but not necessarilythe best solarproduction.
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Solar access and TOF/TSRF examples
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Annual sun path example
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Obstruction Geometry
• D/H as high as possible
• D/H > 2 is California Minimal Shading ~26 degrees
• D/H > 3+ is “shade free 9-3”
r = TAN-1( (H/D)
H/D = TAN ( r)
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Obstruction Elevation example
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Steps for measuring solar access
1. Point south*
* Point south in the northern hemisphere; point north
in the southern hemisphere.
2. Hold Level
3. Press the button
Electronic
Bubble Level ElectronicCompass
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Shade measurement strategies
• Take multiple point readings – Spacing between readings
• Look for worst case
– Array corners – Points closest to obstructions
• Average solar access readings
• Obstruction elevation angles
Note: Be sure you meet the requirements of your state program and rebate calculators
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Using the Solmetric SunEyeTM
Copyright SolmetricCorporation, 2008
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Introducing the Solmetric SunEyeTM 210
• What’s New? – Easy one-handed operation
– Brighter, higher Res. Display (4x)
– Electronic compass & inclinometer
– Dynamic Site-survey mode
– Large capacity battery
– Integrated stylus holder
– Integrated GPS option
– Impact resistant molded case
– 2 year warranty
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Comparing to the original SunEye
• What’s the same? – Easy to use and navigate user interface
– Powerful shade analysis software
– On-board editing tools for “What-if”
– Results viewable right on the SunEye
• Solar Acess, Solar Resource
• Sunpaths, Monthly Solar Access
• Obstruction Elevation Angles
– Desktop Companion Software included
( Proven after shipping thousands of Model 110 SunEyes )
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SunEye Comparison
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Navigation, Select
Power
Orientation (Compass,Inclinometer, GPS)
Preview/QuickLaunch(like Menu/Skyline/New)
HomeSession Properties
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Built-in Inclinometer
• Measure Tilt and Azimuth
• Set SunEye on plane of solar array to measure tilt
• Point arrow toward arrayheading to read azimuth
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Site-Survey Mode
• Survey site• Sunpaths adapt as you
move device
• See how obstructions and
sunpaths overlap
If metal on oof affects the compass
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If metal on roof affects the compass: “Align to Target”
T i h di i th/ti i d l
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To view shading in a month/time window only:
“Windowed Access”
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SunEye’s Key Benefits
• Accuracy and repeatability – Calibrated fisheye lens
– Multiple users, different situations, same results
• Speed and convenience
– Full Sky Preview mode – One shot for the entire skyline
– Point and shoot capability
• Data transfer
– Solmetric PV Designer
– Other Programs
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SunEye GPS Add-On
• GPS option integrated into 210
• Detects latitude/longitude forsession location and automaticsunpath generation
• Records location of each skylinedata set collected
• Reports include file for GoogleEarth™
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SunEye GPS output to Google Earth™
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Data transfer to computer via USB
• SunEye stores more than100 Skylines in memory
• Transfer data to PC forfurther analysis
• View and edit data in sameway as on hand-held
• Create reports and exportfiles to design tools
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Solar Access and Shade Report
• All session data is combinedinto a single hypertext
document• Converts to MS-Word™
• View, Email, or print
Client
Information
Installer businessinformation/logo
A d t fil
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Access raw data files
• Import data files into design software – Excel spread sheet, OnGrid,
PVOptimize, PV*SOL, T*SOL, PVSyst,QuickQuotes, CPF Tools
Month
Day Jan Feb Mar
1 54.17 54.99 67.64
2 54.17 54.99 67.643 54.17 54.99 67.64
4 54.17 54.99 67.64
5 56.63 54.66 67.77
6 56.63 54.66 67.77
7 56.63 54.66 67.77
8 56.63 54.66 67.77
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Updated Software and Accessories
• New software updatesavailable from:www.solmetric.com
– Includes handheld and PCupdates
– Set for auto-update
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Resources
• User’s Guide accessible via desktop software – Help>Solmetric SunEye User’s Guide…
• Knowledge base at:
– http://www.solmetric.com/knowledgebase.html
• Technical Support – 1-877-263-5026, opt 2
– support@solmetric.com
Dec-Jan issue:“Solar Site Evaluation”
www.solarprofessional.comphoberg
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PV String Simulation Model
Irradiance, shade, temperature, wind speed
Module bypass diode configuration
Sun position, panel tilt/Azimuth
Module parameters
Inverter parameters
String wiring AC KWh
S l i PV D i
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Solmetric PV Designer
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SunEye Desktop and PV Designer
SunEye Desktop Software PV Designer SoftwareIncluded with SunEye $400 per year per user
www.solmetric.com/support.html www.solmetric.com/support.html
Transfer data from SunEye device PV layout and estimation of kWh
SunEye device features, views, editing, etc. Advanced hourly weather data, including TMY4
Solar Access, Solar Resource, Windowed Access,
Obstruction Elevation, etc.
Database of modules, including dimensions
Maintain session data on computer Database of inverters, including limits
Export reports and access shade images and
shade data files
String definition and sizing
Print shade reports and use images for proposals Limit checking for voltage, current, power
Compare up to four designs
Import SunEye Skylines as icons onto roof surfaceShade adjusted energy calculations
Data display of monthly and annual totals
Summary pdf report and hourly csv output files
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Questions?
Solmetric Corporation
www.solmetric.com
1-877-263-5026
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