MA-5191A
21-10-2021
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10.1.1.2
BATTERY CONSUMPTION:
In these systems, batteries are used as elements in which energy is stored during the periods
in which power is available from the electrical grid. When there is a failure in this supply, the
batteries are responsible for providing energy to the connected elements, providing autonomy
to the system until they are exhausted.
From an ideal point of view, it could be said that the battery should not consume energy in the
idle states (fully charged when floating or when the equipment is completely off).
However, several operating states can be established for the batteries in which they will be
consuming or supplying energy:
11.
STATE OF CHARGE:
With the presence of AC input, the battery can be considered as another energy-consuming
piece of equipment. During the constant voltage charging phase, the battery will be
charged up to its nominal capacity, while in float mode the internal losses due to self-
discharge will be compensated.
-During constant voltage charging (fast charging) the maximum charging current is
limited to the value set in the charger. The time and consumption during this charging
period will depend on the level of discharge the battery has undergone.
-The battery will be considered charged when the charge current drops below a
threshold parameterised in the charger. The batteries will then be kept at float voltage.
-Sometimes batteries nearing the end of their useful life see their internal leakage
current increase above the threshold value for going into float. To prevent the constant
voltage charging from lasting for an unlimited time, a maximum constant voltage
charging time is defined in the charger, after which the charger switches to the floating
state.