Abt Powerline SC6-12 Product Manual - Page 6

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Discharge

Discharge Characteristics
The curves shown in Figure
rates shown in Table 3 illustrate the typical discharge
characteristics of Powerline SC at an ambient
temperature of 20 C. The symbol "C"expresses the
nominal capacity of the battery measured at a 20-Hour
discharge rate. Please refer to General Specifications to
04
determine the nominal capacity rating of specific
Powerline SC models. The standard industry practice to
determine the nominal capacity of a valve regulated
lead acid battery is to discharge the battery under test
at C and 1.75Vpc.
20
Table 3 shows the different currents that can be drawn
at various discharge capacity rates.
Table 4 shows that the rated nominal capacity of a
battery is reduced when it is discharged at a value of
current that exceeds its 20-Hour discharge rate. This
should be taken into consideration when a battery is
being selected for a particular application.
Figure1. Discharge Characteristics
v/6v
v/12v
6.5
13.0
6.0
12.0
5.5
11.0
5.0
10.0
4.5
9.0
4.0
8.0
3.5
7.0
1
2
3
5
Table 1. Discharge current at stipulated discharge
rates
20 Hr.
Capacity
0.05C 0.10C 0.15C 0.20C 0.25C 0.40C 0.60C 1.0C 2.0C 3.0C
7
0.35
0.70 1.05
7.5
0.375
0.75 1.125
8
0.40
0.80 1.20
12
0.60
1.20 1.80
18
0.90
1.80 2.70
1
and the discharge current
o
0.17C 0.019C
0.25C
0.6C
3C 2C
1C
10
20 30
60
2
3
5
10
Hr
Discharge time
Discharge Current(A,20 C)
o
1.4
1.75
2.8
4.2
1.5
1.875 3.0
4.5
1.6
2.0
3.2
4.8
2.4
3.0
4.8
7.2
3.6
4.5
7.2
10.8
Table 2. Discharge capacity at various discharge
rates
20 Hr.
Capacity
7
7
.5
8
12
18
Over Discharge (Deep Discharge)
The dotted line in Figure 1 indicates the lowest
recommended voltage under load, or cut off voltage, for
Powerline SC at various discharge rates. In general, lead
acid batteries are damaged in terms of capacity and
service life if discharged below the recommended cut off
voltages. It is generally recognized that all lead calcium
alloy grid batteries are subject to over discharge damage.
For example, if a lead acid battery were discharged to
zero volts, and left standing in either "on" or "off " load
0 . 0 5 C
conditions for a long period of time, severe sulphation
would occur, raising the internal resistance of the battery
abnormally high. In such an extreme case, the battery
may not accept charge. Powerline SC have been designed
to withstand some levels of over-discharge. However,
whilst this is not the recommended way of operation,
20 30
Powerline SC can recover their capacity when recharged
correctly. Final discharge voltage is shown in Table 3.
Table 3. Final discharge voltage
Discharge current
7.0 14.0 21.0
0.2 C ≤
0
7.5
15 22.5
8
16
24
0.5 C ≤
0
12
24
36
18
36
54
If a battery is to be discharged at a rate in excess of 3C
Amps, please contact us prior to use.
Temperature characteristics
At higher temperatures, the electrical (Ah) capacity of a
battery increases and conversely at lower temperatures,
the electrical (Ah) capacity of a battery decreases.
Discharge Current(A,20 C)
10Hr
5Hr
20Hr
TO 1.75V/C TO 1.75V/C TO 1.75V/C TO 1.70V/C TO 1.60V/C
0.350
0.651
1.180
0.375
0.698
1.287
0.400
0.745
1.374
0.600
1.116
2.057
0.900
1.674
2.978
Final discharge voltage
(Ampere)
I
≤0.2 C
0
20
I<
0.5 C
0
20
20
I<
1.0 C
20
20
1.0C ≤
I
20
o
3Hr
1Hr
1.865
4.410
2.020
4.775
2.128
5.040
3.197
7.560
4.688
11.340
(V/c)
1.75
1.70
1.65
1.60