Battery Charge Controllers

All of the below charge controllers operate on the same principle.

Typically the chassis battery is connected to the engine alternator and the coach battery is connected to a DC converter.

The charge controller monitors battery voltage(s) and controls a solenoid which bridges the positive leads of the coach and chassis batteries.

If a monitored battery voltage rises above 13.3 volts for about 12 seconds the controller closes the solenoid. (cut on)

If all monitored batteries voltages drops below 12.0 volts for about 2 seconds the controller opens the solenoid. (cut off)

IRD (Isolator Relay Delay) modules only monitor one battery (usually the chassis battery). Therefore, the engine alternator charges the coach battery after the chassis battery rises above the cut on voltage. The DC converter can only charge the coach battery.

BIC (Battery Isolator Controller) modules do the same thing but will also automatically close the solenoid to provide an automatic 'jump start' when needed.

BIRD (Bi-directional Isolator Relay Delay) modules monitor both batteries. This allows either the engine alternator or the DC converter to charge both the coach and the chassis batteries.

Putting 12 volts on gen-set inputs (for those modules so equipped) disable the unit to prevent connecting engine alternator output to DC converter output.

Stand Alone Charge Controllers
Part Number	Type	Current	Voltage	Brochure	Service Manual	Notes
00-00629-120	IRD	100	12			Encapsulated
00-00629-240	IRD	100	24			Encapsulated
00-00265-000	IRD	200	12
00-00131-000	BIC	100	12
00-00362-100	BIRD	100	12
00-00366-000 (obsolete use 00-00839-000)	BIRD	200	12			Changes cutoff voltage from 12.0 volts to 12.8 volts when IGN signal present. Gen-Set input.
01-00564-120	Watch	100	12
01-00564-240	Watch	100	24
00-00839-000	BIRD	200	12			Changes cutoff voltage from 12.0 volts to 12.8 volts when IGN signal present. Gen-Set Input.