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- Q536 - Electrical, Electronic, & Control Engineering
312. Suppose a cargo vessel of 1600 gross tons or more is fitted with emergency storage batteries for the purpose of supplying emergency lighting and power. According to 46 CFR, Subchapter J (Electrical Engineering), the capacity of the storage batteries is such that they should be able to successfully power the emergency loads for a period of 18 hours. Beginning with fully charged batteries, what is the minimum allowable percentage of the voltage rating of the batteries after the 18 hour discharge period assuming a nominal voltage rating of 24 VDC and operating at rated capacity.
46 CFR Subchapter J requires emergency storage batteries on vessels of 1600 gross tons or more to maintain power for 18 hours. The regulations specify a minimum allowable voltage of approximately 88% of the battery's nominal voltage after this discharge period.
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