nominal energy capacity divided by the nominal active power during discharging
Note 1 to entry: The second (s) is the base unit of the nominal discharging duration; other units can also be chosen for convenience (e.g. h). Note 2 to entry: With reference to an EES system based on secondary batteries and to the definition of "discharge rate", the nominal discharging duration tND is the minimum duration for which the secondary batteries' rated capacity should be declared (this rated capacity should be also compatible with PDN).
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