Abt TM12-160W Producthandleiding - Pagina 12

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Battery Charging

Correct battery charging ensures the maximum
possible service life for the battery.
There are three major methods of charging:
10
Constant Voltage Charging
Constant Current Charging
Two Stage Constant Voltage Charging
1. Constant Voltag Charging
This is the recommended method of charging for VRLA
batteries. It is necessary to closely control the actual
charge voltage to ensure that it is within the limits
advised.
Float Service: 2.25-2.30 Vpc at 20 C
Cycle Service: 2.40-2.50 Vpc at 20 C
Sacredsun suggest that the initial current should be
set within 0.3C Amps for TS/ 0.3 C Amps for TM.
20
It is necessary to charge a greater amount of energy
into the battery than was taken out of the battery on
discharge. The actual current indicating that the
battery is fully charged is approx 2mA/Ah under
charging voltage is 2.30Vpc@20 C.
2. Constant Current Charging
This method of charging is generally not
recommended for VRLA batteries. It is necessary to
understand that if the batteries are not removed from
the charger after reaching a state of full charge,
considerable damage will occur to the batteries due to
overcharging.
3. Two Stage of Constant Voltage Charging
This method should not be used when the battery and
load are connected in parallel. If this method is to be
used, it is suggested that the ABT technical
department is contacted.
4.
Effect of Temperature on Charging Voltage
As temperature rises, electrochemical activity in a
battery increases. Similarly, as temperature falls,
electrochemical activity decreases. Therefore,
conversely, as temperature rises, charging voltage
should be reduced to prevent over charge, and
increased as temperature falls to avoid undercharge.
In general, to assure optimum service life, use of a
temperature compensated charger is recommended.
The recommended compensation factor for TS&TM
batteries is -3mV/ C/Cell (stand by). The standard
center point for temperature compensation is 20 C.
o
o
20
o
o
5.Effect of Voltage on Battery Gassing
Although the batteries are of the recombination
type and the amount of gassing at normal
operating voltages and temperature is negligible, if
the charging voltage is increased, gassing will
occur despite the recombination design of the
product. Gassing does not normally occur while the
battery is operating under float conditions and
normal constant voltage recharge of 2.25-2.30 Vpc
o
at 20 C. Very little gassing occurs when the battery
is recharged under normal cycling recharge
procedures. However, higher voltages especially
under conditions of constant current charging will
substantially increase the volume of gas.

Discharge Characteristic

Battery discharge characteristics
The discharge capacity of a lead acid battery varies
and is dependant on the discharge current,
discharge temperature and end voltage. ABT
TS/TM... use a discharge rate at the 20-hour rate.
i. e. the capacity of the battery at 20 hours
discharged to an end voltage of 1.75Vpc at a
temperature of 20 C.
General Comments
The discharge curves show the minimum design
parameters for each fully charged battery after
installation. Full capacity is reached after some
initial service.
Float Service.
One month after installation and recharging.
Cycle Service.
Within three to five cycles after initial charge and
service entry.
Effect of temperature on capacity:
Rough correction factor of the capacity, according
to the temperature, reference temperature
o
being 20 C.
Characteristic discharge curve for TS/TM...W
Voltage
13.0
12.0
11.0
10.0
9.0
8.0
1
2
o
o
0.1C
0.18C
1C 0.75C
3C
5
10
20
60
5
10
2
Min
H
Discharge time
20