IEEE Std 485:2020 pdf download.IEEE Recommended Practice for Sizing Lead-Acid Batteries for Stationary Applications.
Methods are described for defining the dc load and for sizing a lead-acid battery to supply that load for stationary battery applications in float service. Some factors relating to cell selection are provided for consideration. Installation, maintenance, qualification, testing procedures, and consideration of battery types other than lead acid are beyond the scope of this recommended practice. The design of the dc system and sizing of the battery charger(s) are also beyond the scope of this recommended practice.
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they shall be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
IEEE Std 45O, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead- Acid Batteries for Stationary Applications.
IEEE Std 484TM, IEEE Recommended Practice for Installation Design and Installation of Vented Lead-Acid Batteries for Stationary Applications.
IEEE Std 1184-2OO6, IEEE Guide for Batteries for Uninterruptible Power Supply Systems.
IEEE Std 1187TM, IEEE Recommended Practice for Installation Design and Installation of Valve-Regulated Lead-Acid Storage Batteries for Stationary Applications.
IEEE Std 1188TM, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications.
IEEE Std 1881TM, IEEE Standard Glossary of Stationary Battery Terminology.
3. Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary Online’, or IEEE Std 188 1TM, IEEE Standard Glossary of Stationary Battery Terminology, should be consulted for terms not defined in this clause.
cell size: The rated capacity of a cell or the number of positive plates in a cell.
continuous load: Loads that are energized throughout the duty cycle.
coup de fouet: Initial voltage drop and recovery experienced when discharging a lead-acid battery. duty cycle: The sequence of loads a battery is expected to supply for specified time periods.
equalizing charge: A charge, at a level higher than the normal float voltage, applied for a limited period of time, to correct inequalities of voltage, specific gravity, or state of charge that may have developed between the cells during service.
float service: Operation of a dc system in which the battery spends the majority of the time on float charge with infrequent discharge. Sm: stand by service.
momentary load: loads that can occur one or more times during the duty cycle, but are of short duration, not to exceed one minute during any occurrence.
non-continuous load: loads energized only during a portion of the duty cycle.IEEE Std 485 pdf download.