reduce the process electrical energy requirements to a low level, so that about three months of operation of the SSPS will generate the amount of energy utilized. This can be accomplished by developing new processes and new equipment that will provide energy efficiencies in the follbwing areas: 1. Production of metallurgical-grade silicon, 2. Production of high-purity silicon metal, 3. Formation of large area silicon crystals, 4. Formation of P-N junctions in cells, 5. Attachment of metal contacts on cells, 6. Deposition of antireflection coatings, 7. Interconnection techniques, 8. Blanket-lamination techniques, 9. Concentrator minor formation, 10. Concentrator filter deposition, and 11. Selection of materials used in all of these areas. The energy requirements for all the conventional processes have to be assessed to determine areas where substantial reductions in energy use will be significant. Theoretical energy-requirement limits for performing each reaction or operation can then be determined so that the potential and objectives are known. New processes and equipment will then be designed that meet these objectives. h. Key Issue No. 8 — High-Voltage, High-Power Switching Multi-megawatt solar power generation will require switching protection and control systems capable of reliable operation at a high level. The objective of this program is to determine the best type or types of switching devices for this application and to develop and test representative modules. Specific objectives are: 1. A switch capable of connecting a solar panel submodule of nominally 40,000 volts and 500-ampere capacity to a 40,000 V-dc collector bus; with potential to achieve 60,000 V-dc.
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