Charging Request - Narada 12NDT26 Operation Manual

35
≥40
Note: If ambient temperature below 5° C or above 40° C, temperature compensate is no
longer go on.
3.4 Ambient Temperature and Life
Temperature raise can destroy battery, and reduce the service life .when the ambient
temperature exceed 25° C，the service life reduce half for each raised 10° C, for
example, the battery design service life is 10 years under 25° C, But if operated under
35° C, the service life can only be 5 years, there is a formulas follows:
（ － ）
＝t
T 25 /10
t × 2
25 T
wherein: T actual ambient temperature；
t design life under T;
T
t design life under 25° Ccondition
25
So that the ambient temperature should be controlled, the heat dispersing of VRLA
battery is not quite good, when the temperature run up to some extent can destroy the
battery and cause heat lose control phenomenon. If the temperature inside reach too
high some measures should taken to control it and the distance should not less than
10mm, and meanwhile adjust the floating voltage and equalization charging voltage
according to the manual request.

4. Charging request

4.1 Equalization charging
Following situation should take equalization charging:
a. There are more than two batteries which voltage is under 13.0V in one group
b. More than three months after floating operation
Equalization charging is recommend as follows: charge the battery group with
constant current not exceed 0.2C
14.1V/block(25° C)，then change into constant voltage of 14.1V/block charging,
Equalization charging time is 24 hours.
4.2 Battery charging
Under following situation the battery group need charged method as equalization
charging:
Operation manual for Acme series V4.2
2.30
2.275
A till the average voltage go up to
10
- 20 -
14.10
13.65