IEEE 1679-2020 pdf free.IEEE Recommended Practice for the Characterization and Evaluation of Energy Storage Technologies in Stationary Applications.
An energy rating expresses usable energy storage capacity of the device. For energy ratings to be meaningful. all limiting parameters such as rate. temperature. state of charge ISOC), and cnd-of-dischargc voltage should be specified. Energy ratings should be expressed in watt-hours (Wh). It is also recommended to know the coulombic storage capability for a given discharge rate. This is usually tcmicd capacity and is expressed in ampere-hours(Ah). If the capacity is given in watt-hours, then the nominal voltage should also be specified to allow calculation of the capacity in ampere-hours. The nameplate rating of thc devicc in watt-hours or kilowatt-hours should be accompanied by the rate of discharge in watts or kilowatts or the time over which the rated energy can be discharged.
Other rating methods may also be provided, such as specific energy (watt-hours/kilogram [Whkg]), energy density (watt-hours.litcr [WhLJ). etc. If these parameters are specified, the configurations and conditions under which the rating is valid should he included.
Energy ratings are normally based on products at the beginning of life. Thc manufacturer should state how available energy from the device may amy over service life (see also 32).
Power ratings for energy storage devices arc specified in a number of ways. In order to provide a rating that is useful for comparison of technologies, the rating should include all limiting parameters, such as the following:
The duration of the discharge;The operating voltage range.
NOTE In addition to power limitations in charge or disehargc due to initial operating temperature, operation may also be re.trictcd by temperalure rise due to Joule hcating
The SOC for which the poser rating is specified
Power ratings should be specified in watts W) over a defined period of time.
Other rating methods may also be provided, such as specific power(wattskilogram IW’kgj). power density (wattsliter [W/Lj), etc. If these parameters are specified, the conditions under which the rating is valid (rate, temperature. SOC. discharge time. etc.) should be included, and the ratings should be valid for a complete system.
Power ratings are normally based on products at the beginning of life. The manufacturer should state how the available power from the device may vary over time see also 3.2).IEEE 1679 pdf download.