Xantrex Technology TC2 204060 manual Two-Stage Charging

TC2 204060 Series BattChg Owners Guide.book Page 30 Friday, July 8, 2011 11:44 AM

Installing Batteries

Two-Stage Charging

The two-stage charging mode employs the following sequence: Bulk and Absorption. It runs similar to the three-stage sequence except that there is no float stage; after the absorption stage the charger stops providing current to the battery and the charger output drops to 9 V (12 Vdc chargers) or 18V (24 Vdc chargers). In this manner, DC loads draw power supplied by batteries and the charger enters a “rest or standby stage.” Like the three- stage sequence, the charger will restart the charging cycle in the Bulk stage if the lowest battery voltage of the three banks drops below 12.5 V (12 Vdc chargers) or 25 V (24 Vdc chargers) for 15 minutes. After seven days, the charger will automatically restart charging in order to refresh the batteries.

	Vbat = Vabs		lout < 10% lrating
	for 1 minute
			for 1 minute
Battery Voltage
	Vbat = Vgas
	for 1 minute
Vgas voltage
				GO TO BULK when
Charge				Vbat < 12.5 V for
				15 minutes
start
	BULK	ABS	ABS	REST
		CC	CV	(Standby)

Time

ABS CV timeout

		max 5 hrs
Start of			REST (Standby)
			timeout max 7 days
charging cycle
	Total ABS timeout
	max 8 hrs

Figure 10 Two-Stage Charging Process

30 Truecharge2 Series Battery Charger Owner’s Guide