| Definition: | useful energy output at the primary POC divided by the requested energy input by the EES system, including all parasitic and auxiliary energy needed to run the EES system and evaluated during EES system operation with the same final state of charge as the initial state of charge
Note 1 to entry: The parasitic and auxiliary energy needed to run the EES system includes energy losses, self-discharge, heating, cooling, etc. Note 2 to entry: Energy efficiency is generally expressed in per cent.
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