Xantrex Technology PH1800 manual Figure A-1Three-Stage Charging Process

Specifications

Float Stage	In the Float stage, the constant voltage mode limited to 13.7 Vdc. An 8-
	hour timer is started at this point.
	If, during the 8-hour timer, the current rises to 6 A, the unit transitions
	back to the Bulk Stage and starts over.
	If the unit stays at 4A or less for the 8 hour timer, it will transition to
	Standby Mode.
Standby Mode	In the Standby Mode, the Charger is OFF but monitors the battery
	voltage. If battery voltage drops below 12.5 Vdc, the unit will start a new
	Bulk stage.

	Bulk	Absorption		Standby
	Stage	Stage	Float Stage	(Stop Mode)
				If the voltage drops to 12.5 Vdc
				while in Standby, the Charger
		14.2 Vdc		will start a new Bulk Stage.
Voltage 12.5 Vdc			13.7 Vdc	12.5 Vdc
	40 A or
Current	10 A
	Maximum
	Charge		4 A
	Amps
	Setting
	Time	4 hours	8 hours
		(Maximum)

40 A or

Current

10 A

Maximum

Charge

Amps

Setting

Time

If the current rises to 6A

during the Float period, the Charger will start the whole cycle back at the Bulk Stage.

4 A	6 A
4 hours	8 hours

(Maximum)

Figure A-1Three-Stage Charging Process

A–4 975-0288-01-01