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to 64%. The slight drop in performance late in the program can be traced to varia bles in operating conditions rather than to any inherent changes in the battery stack. Once all parameters affecting energy efficiency (electrolyte formulation, pH, chlo rine concentration, temperatures, pressures, flow rates, etc.) are optimized, the systemcanbeexpectedtocyclecontinuouslywithgreatconsistency. Logicchanges were incorporated into the microprocessor, the heart of the automatic controller, late in December. These apparently have corrected many control problems and the system is now performing according to specification. It is intended that this system should continue to cycle automatically and unattended for some time to come. Experience indicates that this objective would be more easily reached if reliability improvements can be made to the peripheral equipment. It is recommended that each auxiliary component be examined and, as time permits, modified to this end. It has been suggested that some testing with this system be done more closely approximating the current peak-shaving duty sequence. This would incorporate extended "stand" times between charge and discharge. There is a need to examine the physical and electrochemical characteristics of zinc plates after 3 to 7 hours of inactivity. Also to be evaluated would be effect of stand time on evolution rates and efficiency. REFERENCE 25-1 Development of High-Efficiency, Cost-Effective, Zinc-Chlorine Batteries for Utility Peak-Shaving — 1976. Palo Alto, Calif.: Electric Power Research Institute, March 1978. EM-711. 25-15PDF Image | Development of the Zinc-Chlorine Battery for Utility
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