ANSI/IEEE 485:1978

- Superseded.
Although the storage battery is of primary importance in assuring the satisfactory operation of
generating stations and substations, no single up-to-date guide exists to aid engineers in sizing the battery for a particular installation. This Recommended Practice is based on commonly accepted
methods used to define the load and to ensure adequate battery capacity. The method described is
applicable to all installations and battery sizes. The installations considered herein are designed for "full float" operation with a battery charger
serving to maintain the battery in a charged condition as well as to supply the normal dc load.

This Recommended Practice describes methods for defining the dc load in a generating station or a substation and for sizing a lead storage battery to supply that load. Some factors relating to cell selection are provided for consideration. Installation, maintenance, qualification, testing procedures, and consideration of battery types other than lead storage are beyond the scope of this Recommended Practice. Design of the dc system and sizing of the battery charger(s) are also beyond the scope of this Recommended Practice.