Abt Powerline SC12-7 Manuel du produit - Page 7

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Figure 2 shows the effects of different temperatures
in relation to battery capacity.
Figure 2. Temperature effects in relation
to battery capacity
(%)
120
100
80
6
40
20
0
o
o
o
o
-20
-10
0
10
o
o
o
o
50
-4
14
32
TEMPERATURE
Storage, self discharge and shelf life
Self discharge
The self discharge rate of Powerline SC is
approximately 3% per month when stored at an
o
ambient temperature of 20 C. The self discharge rate
will vary as a function of ambient storage
temperature. Figure 3 shows the relationship between
storage times at various temperatures and the
remaining capacity.
Figure 3. Self discharge characteristics
(%)100
75
50
o
o
40 C(104 F)
25
0
0
3
6
STORAGE TIME (MONTHS)
Shelf Life
In general, when lead acid batteries of any type are
stored for extended periods of time, lead sulphate is
formed on the negative plates of the batteries. This
phenomenon is referred to as "sulphation". Since the
lead sulphate acts as an insulator, it has a direct
detrimental effect on charge acceptance. The more
advanced the sulphation, the lower the
charge acceptance.
Table 4 below shows the normal storage time or shelf
life at various ambient temperatures.
Table 4. Shelf life at various temperatures
Temperature
o
o
o
o
-20 C(-4 F) to -1 C(-30.2 F)
o
o
o
o
0 C(32 F) to 20 C(68 F)
o
o
o
o
21 C(70 F) to 30 C(86 F)
o
o
o
o
31 C(88 F) to 40 C(104 F)
o
o
o
o
41 C(106 F) to 50 C(122 F)
o
o
o
o
30
40
50
C
20
o
o
o
o
68
86
104
122
F
o
o
0 C(32 F)
o
o
10 C(50 F)
o
o
20 C(68 F)
o
o
30 C(86 F)
9
12
15
18
Shelf Life
15 months
12 months
9 months
5 months
2.5 months
Recharging stored batteries
In general, to optimize performance and service life, it
is recommended that powerline sc which are to be
stored for extended periods of time be given a
supplementary charge, commonly referred to as a "top
charge", periodically. Please refer to the
recommendations listed on page 24 under top
charging.
figure 4. Temperature/Life characteristics of
powerline SC
Years
Floating Voltage:2.27V/cell at 20 C battery temperature
100%
75%
33%
7%
3%
20
30
TEMPERATURE
Figure 4 shows extrapolated service life condition for
powerline sc at different ambient temperatures. As can be
seen from figure 4 higher ambient temperatures will
reduce service life.
Available capacity, measured by open circuit voltage
The approximate depth of discharge, or remaining
capacity, in a powerline sc battery can be empirically
determined by referring to figure 5.
Figure 5. Open circuit voltage
vs remaining capacity
(V)
(V)
FOR 6V
FOR 12v
BATTERY
BATTERY
14.0
7.0
13.0
6.5
12.0
6.0
5.5
11.0
5.0
10.0
2
20
40
Impedance
REMAINING CAPACITY(%)
The internal resistance (impedance) of a battery is
lowest when the battery is in a fully charged state. The
internal resistance increases gradually during
discharge, Figure 6 shows the internal resistance of an
Powerline SC12-7 model measured through a 1,000 Hz
AC bridge.
Figure 6. Internal resistance of SC battery
o
o
40
50
60
C
o
o
AT 20 C(68 F)
60
80
100
05