Chapter 11 Battery Backup/External DC In
OVERVIEW
The BCR REPEATER can be battery backed-up by connecting a 12 Volt deep cycle battery to the
battery backup/Ext DC In terminals. If the AC Line fails, the internal relay will switch to where the
battery can power the unit. When AC power is restored, the internal relay takes the battery out of
the circuit and switches to the internal power supply. For convenience, the BCR REPEATER
provides a maintenance charge to keep the battery at its optimum level. The internal charging
circuit can comfortably provide a charge current up to 1.3 Amps to the battery. As the battery
reaches full charge, the charging circuit provides a maintenance charge of around 200 mA. For
virtually maintenance free operation, it is recommended that a GEL CELL type deep cycle battery
be used.
If it is desired for the BCR REPEATER to be powered from a vehicle or an external 12-13.8V supply,
this can be done by connecting the external source to the BCR REPEATER’s Battery/Ext DC
terminals. When the BCR REPEATER is being powered by an external source other than a battery,
DO NOT turn on the internal power supply. If an external power supply other than a battery is
connected and the internal supply is turned on, the internal supply will attempt to ‘charge’ the
external supply, which could damage the external supply. The internal blocking diode protects the
internal power supply from receiving any unwanted voltages or currents from the external supply
or battery.
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