Wiley Electronics ASSET-Windows Acme Solar Site Evaluation Tool - Windows Version


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ASSET-Windows Acme Solar Site Evaluation Tool - Windows Version

Wiley Electronics ASSET-Windows Acme Solar Site Evaluation Tool - Windows Version

Acme Solar Site Evaluation Tool (ASSET)

The ASSET is a patent pending system for evaluating shading at a site. The ASSET allows the user to efficiently analyze and document installation sites. In use, the ASSET is positioned to take a series of pictures at the intended site. The software assembles the pictures into a panorama with the path of the sun superimposed. One can easily see the times when the sun will be shaded.

The complete survey can be done much more quickly than with past methods, so it is easy to optimize installations. In addition, the software incorporates the PVWatts program, written by Bill Marion of the National Renewal Energy Laboratory (NREL) under contract to the Department of Energy (DOE). The program uses hourly historical data from the TMY2 data set to calculate energy captured by the array. All information is available for editing in an Excel spreadsheet.

How does the ASSET work?

The ASSET consists of a precise positioning system, a digital camera, and software.

The above image shows the ASSET in an upright position, as if mounted on a camera tripod. Note the bull's-eye type bubble level for leveling the positioning system. The compass is used to point the system towards the equator (south in the northern hemisphere) because the path of the sun appears in that portion of the sky. The compass has an inner ring which may be used to correct for local magnetic declination. The camera is facing east in the picture and set to an angle of 22.5 degrees. The system may be positioned to take a series of 7 pictures from east to west.

The pictures below are a set of digital photographs taken at the seven positions. Note that the array will not be mounted on this building, this building represents a possible obstruction for the pole mounted array (which was eventually installed on the other side of the parking lot from this building).

ASSET east pictureASSET east southeast pictureASSET south southeast pictureASSET south pictureASSET south southwest pictureASSET west southwest pictureASSET west picture

The following image shows a composite panorama assembled from the seven photographs. Superimposed on the panorama is the path of the sun averaged over each month of the year. The yellow numbers on the grid represent the hours of the day, 6am to 6pm, reading left to right. The months of the year are also indicated in yellow on the lower left of the panorama. As can be seen, the site has some morning and evening shading, especially during winter, but midday is mostly unobstructed. Exposure is excellent during the summer.

ASSET Example panorama

The ASSET comes packed in a foam-padded hard shell case and includes:

  • Camera to computer USB cable
  • Precision positioning assembly
  • Kodak C300 Digital camera
  • CD-ROM with software
  • Camera documentation
  • Charger for camera

ASSET Software Requirements

The ASSET software currently has two versions. The PC version is designed to run on IBM compatible computers with Microsoft Windows operating systems, Windows 2000 or newer. Installation for Windows Vista is slightly modified as noted below. Java is required to be installed for all Windows systems.

The Mac version is designed to run on Macintosh computers with the Mac OS X operating system. The Mac version is not compatible with Intel Mac. Please let us know if you would prefer a Linux platform. We may port the code if there is sufficient interest.

300 MBytes of disk space is required; 512 MBytes of RAM is recommended. The computer must have a USB port or adapter for transferring files from the camera.

Also Known As:
ASSET.Windows
ASSET Windows
ASSET_Windows
ASSETWindows

Note: Specifications and pricing of the Wiley Electronics ASSET-Windows Acme Solar Site Evaluation Tool - Windows Version subject to change without notice. Illustrations and descriptions of the Wiley Electronics ASSET-Windows do not claim to be complete or exhaustive.
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