Chapter 6 Battery 47
Liebert APM 90 Integrated Modular UPS User Manual
The battery must be stored in fully charged state. The battery will lose certain capacity because of self
discharge during the transportation or storage. Charge the battery before use. During the storage, ensure that
the ambient temperature shall not exceed the range of -15
°
C
~
+45
°
C, and the optimal temperature is 20
°
C
~
25
°
C. To compensate for the self discharge of the battery during the storage, the battery shall be charged
every 3 months during the storage. The specific time may differ for different batteries. For details, refer to the
requirement of the battery manufacturer.
It is very important to fully charge the battery before carrying out onsite test on the battery backup time. The
test may take several days. Therefore, it should be conducted after the battery has been subject to
uninterrupted float charging for at least one week.
When the battery has been running for several weeks or subject to two to three charge and discharge cycles,
the battery performance will be increased.
To avoid the battery over-charge or under-charge, please set the battery management parameters according
to the equalizing/float charge voltage and temperature compensation factor specified in the manuals
provided by the battery manufacturer. Please charge the battery immediately after discharge.
6.4
Precautions For Installation Design
Note
Precautions for installation, use and maintenance of the battery are described iin the relevant battery manual provided
by the battery manufacturer. The safety precautions described in this section include the important matters that must
be considered during the installation design. The design results may be changed according to the local situations.
6.5
Battery Installation Environment And Number Of Batteries
6.5.1
Installation Environment:
Fresh air volume (EN50272-2001)
The operating environment of the battery must be ventilated. During the operation of the battery, the
following requirement for the fresh air ventilation shall be satisfied:
Q=0.05 x n x Igas x Crt x 10
–
3
[m
3
/h]
Where:
Q
―
The fresh air ventilation volume per hour, the unit is m
3
/h
n
―
Number of cells
Igas
―
The gas evolving current density under battery float charging or equalizing charge conditions, the unit
is mA/Ah
Igas=1, under the float charging condition of 2.27V/cell
Igas=8, under the equalizing charge condition of 2.35V/cell
Crt
―
20hr battery rated capacity
