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mechanically damaged. This prevented further testing even though there was no evi dence to suggest that the electrode was not functioning routinely when destroyed. Table 27-1 ELECTROCHEMICAL OPERATIONAL TIME ACCUMULATED THROUGH PHASE I Cell Designation Ampere hours/cm * Present Charge Discharge Status PCS-MH-2 101.6 71.1 on test PCS-HB 119.3 82.1 retired *Note that low coulombic efficiency calculated using these values is due to zinc-on-zinc cycling mode, and as such does not reflect that achievable under the complete dis charge type of cycle planned for peak-shaving. CONCLUSIONS AND RECOMMENDATIONS The one remaining single cell continues to cycle under control of relatively un sophisticated equipment. As a result it is being cycled in the zinc-on-zinc mode with considerable manual attention being required. On the other hand, the 1.7kWh battery system described in Section 25 of this report is now cycling 96 chlorine electrodes in a complete load-leveling test regime under fully-automatic control. This later system has, to date, nearly surpassed the accumulated cycles of the single-cell test systems. The larger battery, designed more like a peak-shaving stack, together with its developed auxiliaries and the microprocessor-based controller, provides a superior and more cost-effective method of testing porous- graphite chlorine electrodes. It is recommended that the single-cell testing pro gram be terminated until such time as a meaningful accelerated life test can be developed. In the meantime, the aging of porous-graphite electrodes will continue to be monitored in the 1.7kWh battery system. REFERENCES 27-1 Development of High-Efficiency, Cost-Effective, Zinc-Chlorine Batteries for Utility Peak-Shaving — 1976. Palo Alto, Calif.: Electric Power Research Institute, 1978, EM-711, Part II, Section 4. 27-2PDF Image | Development of the Zinc-Chlorine Battery for Utility
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