06
POWERLINE
SC
SERIES
Charge
Charge
Correct charging is one of the most important
factors to consider when using valve regulated lead
acid batteries. Battery performance and service life
will be directly affected by the efficiency of the
charger selected. The basic charging methods are:
Constant Voltage Charging
Constant Current Charging
Two Stage Constant Voltage Charging
Charging at constant voltage is the most suitable
and commonly used method for charging valve
regulated lead acid batteries. Figures 8 - 13 show
the charging characteristics of Powerline SC when
charged by constant voltage chargers at 2.275
volts/cell, 2.40 volts/cell and 2.50 volts/cell when
the initial charging current is controlled at 0.1C
Amps and 0.25C Amps.
Figure 7 shows one example of a constant voltage
charging circuit. In this circuit, the initial charging
current is limited by the series resistance R1.
The recommended float charge voltage for
Powerline SC at 20 C is 2.275vpc ±0.005v. this
should be the measured average for the total
battery, however when measured within a battery
network or string the allowable tolerances can be
expected between 2.25vpc to 2.30vpc.
●
●
●
Constant Voltage Charging
Note
o
Figure 7. One example of constant voltage
chargeine circuit
AC
T
D
1
C
1
11
12
6
5
R
3
7
IC
10
2
13
C
2
R
4
R
5
R
1
TR
1
R
2
VR
Batt.
D
2
LOAD
4
3
CHARGING TIME (HOUSE)
Figure 8. Charging characteristics
(%) (xCA) (V)
0.1CA-6.825V(13.65V,4.55V)CONSTANT VOLTAGE
CHARGING AT20 C(68 F)
o
o
CHARGED
VOLUME
CHARGING
CURRENT
CHARGE
VOL
T
AGE
FOR
6V
BA
T
T
ER
Y
CHARGED
VOLUME
CHARGE VOLTAGE
CHARGING CURRENT
AFTER 100% DISCHARGE
AFTER 50% DISCHARGE
CHARGE
VOL
T
AGE
FOR
12V
B
A
T
TER
Y
CHARGE
VOL
T
AGE
FOR
4V
BA
T
TER
Y
120
100
80
60
40
20
0
0.02
0.08
0.1
0
5
10
15
20
25
30
35
40
11.0
12.0
13.0
14.0
4.50
4.00
3.50
0
(V)
0.04
0.06
7.50
7.00
6.50
6.00
5.50
140
120
100
80
60
40
20
0
5.00
4.50
4.00
3.50
0
2
4
6
8
10
12
14
16
18
20
CHARGE VOLTAGE
CHARGED
VOLUME
AFTER 50% DISCHARGE
AFTER 100% DISCHARGE
CHARGING TIME (HOURS)
7.50
7.00
6.50
6.00
5.50
CHARGING
CURRENT
11.0
12.0
13.0
14.0
15.0
(V)
0.1CA - 7.20V(14.4V,4.8V) CONSTANT VOLTAGE
CHARGINGAT 20 C (68 F)
o
o
Figure9. Charging characteristics
CHARGED
VOLUME
CHARGING
CURRENT
CHARGE
VOL
T
AGE
FOR
6V
BA
T
T
ER
Y
CHARGE
VOL
T
AGE
FOR
12V
B
A
T
TER
Y
CHARGE
VOL
T
AGE
FOR
4V
BA
T
T
ER
Y
(%) (xCA)
(V)
0.1
0.06
0.04
0
0.08
0.02
140
120
100
80
60
40
20
0
5.00
4.50
4.00
3.50
0
2
4
6
8
10
12
14
16
18
20
CHARGE VOLTAGE
CHARGED
VOLUME
AFTER 50% DISCHARGE
AFTER 100% DISCHARGE
CHARGING TIME (HOURS)
7.50
7.00
6.50
6.00
5.50
CHARGING CURRENT
11.0
12.0
13.0
14.0
15.0
(V)
0.1CA - 7.50V(15.0V,5.0V) CONSTANT VOLTAGE CHARGING
Figure10. Charging characteristics
CHARGED
VOLUME
CHARGING
CURRENT
CHARGE
VOL
T
AGE
FOR
6V
BA
T
TER
Y
CHARGE
VOL
T
AGE
FOR
12V
B
A
T
TER
Y
CHARGE
VOL
T
AGE
FOR
4V
BA
T
T
ER
Y
AT 20 C (68 F)
o
o
(%) (xCA)
(V)
0.1
0.06
0.04
0
0.08
0.02
Figure 11. Charging characteristics
(%)
140
120
100
80
60
40
20
0
0.05
0.10
0.15
0.20
0.25
7.50
7.00
6.50
6.00
5.50
(xCA)
(V)
0.25CA-6.825V(13.65V,4.55V)CONSTANT
VOLTAGE CHARGING AT20 C(68 F)
o
o
CHARGED
VOLUME
CHARGING
CURRENT
CHARGE
VOL
T
AGE
FOR
6V
BA
T
T
ER
Y
CHARGED VOLUME
CHARGE VOLTAGE
CHARGING CURRENT
AFTER 100% DISCHARGE
AFTER 50% DISCHARGE
0
2
4
6
8
10
12
14
16
18
20
11.0
12.0
13.0
14.0
15.0
5.00
4.50
4.00
3.50
CHARGE
VOL
T
AGE
FOR
12V
B
A
T
TER
Y
CHARGE
VOL
T
AGE
FOR
4V
BA
T
T
ER
Y
CHARGING TIME (HOUSE)
0
(V)
INTERNAL
RESISTANCE
(m
)
Ω
TERMINAL
VOLTAGE
(V)
BATTERY:SC12-7
AMBIENT TEMPERATURE:20 C(68 F)
MEASURED WITH 1000H AC BRIDGE
o
o
Z
0
10
20
30
40
50
60
70
80
100
110
120
13.0
12.0
11.0
10.0
9.0
0
2
4
6
8
10
12
14
16
18
20
22
DISCHARGE TIME(HOUSE)
3Hr
5Hr
10Hr
20Hr