Preparation of this standard was done by a group of volunteers representing users, design engineers, manufacturers, scientists, and the federal government. Work sponsored by the U.S. Department of Energy and the Electric Power Research Institute in the solar and off-peak energy programs at government laboratories and universities has been especially helpful. Particular thanks go to Roger Cole of Argonne National Laboratory for his definitive work in creating and preparing this revised standard. James Martin of Oak Ridge National Laboratory and Professor M.W. Wildin of the University of New Mexico made significant contributions.

Units: Dual