8 | Product Function
1.4 CHARGING PROCESS
BOOST
The Boost stage maintains a constant current until the battery voltage reaches its Absorption
Voltage. The current in Boost stage may vary during operation in order to maintain safe operating
temperature, or to limit the difference between input and output voltages.
ABSORPTION
The Charger will then move to Absorption stage which maintains a constant voltage level for a
predetermined period of time or until the current being drawn by the output battery drops to less
than 4 A for 30 seconds; after which the Charger will enter Float stage.
FLOAT
Float stage maintains 13.3 V on the output battery, keeping the battery topped up. This counteracts
the battery’s self discharging or loads applied to the battery. When the battery loses charge, the
Charger will automatically move back into the Boost stage.
Figure 1: Charging Process
FloatAbsorptionBoost
The BCDC has automatic Timeouts to protect the battery from being damaged by overcharging. The BCDC will
automatically move from Boost to Absorption or Float according to these timeouts. If a Timeout occurs before
the battery is fully charged, the charge process will begin again from the Boost stage after a brief 'rest-period'.
The Li profile timeouts have been adapted to suit optimal charging for large lithium battery banks.
1.5 BATTERY TEST MODE
The unit features a battery test mode which occurs every 100 seconds. The test mode is designed
to both test that the input conditions are still met and check for the presence of a battery on the
output of the unit. This feature is designed to protect the vehicle battery from over discharge and
protect the vehicle and wiring in the event of damage to the output connection. During low output
current situations (when in Float mode for example) this battery test may take up to 60 seconds to
complete.
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