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PREFACEPhotovoltaic (PV) generation of electricity marks the dawn of a new energy e r a In total silence, W systems remarkably and simply convert sunlight directly into electricity. This electricity powers the tools of civilization from the mountain tops to the seas and into the far reaches of outer space. It is now possible to build a home anywhere you desire or even to travel to the moon and have the conveniences of a secure and reliable W power supply. In recognition of the energy savings potential of PV systems for terrestrial applications, the Department of Energy in conjunction with the U.S. PV industry has conducted research and development to continue improving the PV technology. This effort has succeeded brilliantly, bringing this space age dream down to earth so that in many applications, PV is now the costeffective and most reliable choice.A major obstacle to the widespread use of W was a lack of information on how PV operates and the types of PV products available. In response to this need, the Pacific Northwest Laboratory under contract to the Department of Energy prepared the Photovoltaic Product Dfrectory a n d Buyers Guide in 1981. Thousands of copies have been purchased and its distribution is worldwide.Since publication of the first edition in 198 1, the PV industry has grown tremendously. This growth has not only occurred in kilowatts of PV sold annually, but also in terms of the variety and range of products and services offered. Therefore, a revised edition is required to reflect these changes.Photovoltaics are providing energy for an ever-growing number of applications worldwide. More than ten thousand residences, including vacation chalets and remote residences, enjoy the advantages of simple and easily maintained PV power supplies to provide daily electrical needs. More than ten thousand navigational beacons and warning lights, using stored PV power, provide safe passage for ships and aircraft. Photovoltaics are also used in utility applications in southern California The list of viable applications continues to grow as inventive thinkers ponder the possibilities of PV technology.The information presented in this directory should be of interest to a wide audience because it describes products and appliances that have use for the home, farm, or factory as well as on the road or seas and in remote areas of the great outdoors. Reliable and cost-effective W-powered products are available for those who are willing to apply them. This directory is intended to help you decide if currently marketed PVproducts are appropriate for your needs.

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This report was prepared as an account of work sponsored by the United States Government. Neither the United S t a t a nor thc Department of Energy, nor any of their employets, nor any of their contractors, subcontractors, or their employces, makes any warranty, expras or implied, w w m e s any kgal liability or responsibility for the accuracy, completeness or usefulness of any information. apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. The views, opinions and conclusions contained in this repon are those of the contractor and do not necessarily represent those of the United Stata Government or t k United States Deplrtment of Energy.