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. What is the maximum initial voltage of the batteries allowable at the beginning of the 18 hour discharge period assuming a nominal voltage rating of 24 VDC.
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