Abstract: The invention provides systems and methods for provisioning a site with an energy system such as a solar energy system. A system according to an embodiment of the invention comprises a user interface module providing a graphical user interface for receiving information from a user, for example a potential purchaser. The information includes location information for the site to be provisioned. An image retrieval module is coupled to the user interface module and to a source of geographical information. The image retrieval module retrieves at least one image of the site corresponding to the location provided by the user. A sizing module is configured to enable a user to measure an installation surface represented in the image. Energy system components are selected based on the measurements.

Abstract: The invention provides consumers, private enterprises, government agencies, contractors and third party vendors with tools and resources for gathering site specific information related to purchase and installation of energy systems. A system according to one embodiment of the invention remotely determines the measurements of a roof. An exemplary system comprises a computer including an input means, a display means and a working memory. An aerial image file database contains a plurality of aerial images of roofs of buildings in a selected region. A roof estimating software program receives location information of a building in the selected region and then presents the aerial image files showing roof sections of building located at the location information. Some embodiments of the system include a sizing tool for determining the size, geometry, and pitch of the roof sections of a building being displayed.