Product Function | 9
2 PRODUCT FUNCTION
2.1 Charging Stages
BOOST
When the Battery Charger is correctly installed and has a valid power input source it will begin
charging the auxiliary battery in the Boost stage. 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 preset period of time or until the current being drawn by the output battery drops to
a predetermined level for 30 seconds; after which the Charger will enter Float stage.
FLOAT
Float stage maintains 13.3 V (13.6 V for LiFePO
4
) 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 Battery Charger will move back into the Boost stage.
Figure 2.1.2.1:
Charging Stages
Voltage
Float
Absorption
Boost
Current
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 designed to suit optimal charging for large lithium battery banks.
CAUTION
When using the BCDC Core to charge a Lithium Iron Phosphate battery, only batteries that
feature an inbuilt battery management system featuring under and over voltage protection
and cell balancing are suitable.
Summary of Contents for BCDCN1225
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