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There were 46 failures during this 100 cycles (Table 26-1). Of these, 22 were maintenance-related. Eight were due to store failure; the store, motor, and agi tator assembly were replaced. Four were due to fluid exchange (at least one and possibly all caused by frozen store inlet tube), the system was replumbed hopefully to assure that this would not reoccur. Four were due to the controller skipping cleanout (it reoccurred after cycle 300 and is discussed in section on cycles 300- 323); two were due to miscellaneous controller problems (they never reoccurred); six were due to indeterminate reasons; two did not reoccur (sump temperature and low Cl^ rate); and four discharge undervoltage failures reoccurred after cycle 300 (see section on cycles 301-323). Sixty-six cycling days were lost. This 100 cy cles took over four months to complete...................................... There were seven electrolyte changes: after 36 cycles (187-222) due to iron conta mination of electrolyte, after no cycles due to liquid exchange between store and battery, after 63 cycles (223-285) due to iron contamination of electrolyte, after eight cycles (286-293) due to fluid exchange, after no cycles due to loss of electro lyte from seal failure on the main electrolyte pump, after no cycles due to elec trolyte contamination. Cycles 301-323 The average energy efficiency of these cycles was 70.7%. The standard deviation was 4.3 (this is due to the 4 cycles preceding 305). By examination of Figure 26-5, it is apparent that the overall efficiency has increased significantly and that most of this gain has been in coulombic efficiency. From cycle 305 on there was a signifi cant change in performance. There is no apparent reason for this increase, the elec trolyte was changed but it was of the same composition as had been in previous use. The system filter was also cleaned. The improved performance has been maintained since then even after prolonged stand times and changes of electrolyte. There were 22 failures (Table 26-1) during these 23 cycles. Eleven failures were maintenance related (normal mechanical problems), one store failure (new type store put on), one occurrence of fluid exchange between store and battery, six were due to the controller skipping cleanout (this was repaired by the electrical depart ment) , one due to contamination of electrolyte, two more were due to occurrences of discharge undervoltage (there is still no explanation for this). Seventy-nine cycle days were lost (Figure 26-6). These 23 cycles took approximately three months to complete.PDF Image | Development of the Zinc-Chlorine Battery for Utility
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