Toshiba 1600XP operation manual Battery Recharging, Model Vmax Vmin Icharge

10.7 Battery Recharging

The illustration below shows a graphical representation of the UPS battery recharge process after a full discharge.

CURRENT	VOLTAGE
		CHARGING	BATTERY
		CURRENT
ICHARGE			CHARGE
	VMAX		VOLTAGE
	VMIN
	DISCHARGE
	SHUT-OFF
	POINT
			FULLY
			CHARGED
0	0		TIME
	PERIOD 1	PERIOD 2	PERIOD 3

The recharge process usually consists of three periods. During the first period, the current is maintained at approximately 1 ampere. This current limit is the maximum value that can be used to charge the batteries (for minimal recharge time) while assuring safety and long battery life. In the second period, constant-voltage control starts and current gradually decreases as the batteries charge to their normal fully charged state. In the third period, a slight trickle current continues to flow into the batteries to keep them fully charged and floating at the normal Vdc level. A full recharge usually requires 24 hours (90% recharge in 12 hours) after a complete discharge.

The following chart shows the rated maximum and minimum battery voltages and the charge current for each of the sizes.

RATED BATTERY VOLTAGES

Model	Vmax	Vmin	Icharge
3.6 kVA	163 V	114 V	1.0 A
6 kVA	245.7 V	170 V	1.0 A
8 kVA	327 V	227 V	1.0 A
10 kVA	327 V	227 V	1.0 A
14 kVA	327 V	227 V	1.0 A
18 kVA	327 V	227 V	1.0 A
22 kVA	327 V	227 V	1.0 A

1600XP Series Installation and Operation Manual 19