The HP Power Advisor is a tool provided by HP to assist in the estimation of power consumption and proper selection of components including power supplies at a system, rack, and multi-rack level.
A variety of additional features are also provided including a condensed bill of materials, a cost of ownership calculator, and a power report.

HP Power Advisor is a downloadable Windows based application that operates on your desktop. Instructions on how to download and use the tool, as well as other helpful links, are located in the sections below.
Download it here: http://h18004.www1.hp.com/products/solutions/power/index.html