| Definition: | EES system duty cycle comprising four controlled phases: a charge phase, then a pause, then a discharge phase and then another pause
Note 1 to entry: The patterns of the charge and discharge phases are generally linear (constant active power); however, different patterns are also possible. In the figure, energy losses and self-discharge are not considered. E2 = 0 (so it is not represented in the figure), E4 = 0 (so it is not represented in the figure). t2 = 0 or t4 = 0 are possible options.
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Key
| t1 | duration of the charge phase |
| E1 | energy measured at the primary POC during the charge phase |
| t2 | duration of the pause after charge |
| t3 | duration of the discharge phase |
| E3 | energy measured at the primary POC during the discharge phase |
| t4 | duration of the pause after the discharge |
| E0 | initial state of charge |
Figure 1 – Illustrative example of charging/discharging cycle
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