Chapter 6 Battery 89
Liebert EXM 80kVA ~ 200kVA UPS User Manual
6.4
Precautions For Installation Design
Note
Precautions for installation, use and maintenance of the battery are described in 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 I
gas
x C
rt
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
I
gas
―
The gas evolving current density under battery float charging or boost charge conditions, the unit is
mA/Ah
I
gas
=1, under the float charging condition of 2.27V/cell
I
gas
=8, under the boost charge condition of 2.35V/cell
C
rt
―
20hr battery rated capacity
Temperature
Table 6-1
Range of ambient temperature
Type
Temperature
value
Remark
Recommended
optimal
temperature
20°C ~ 25°C
The ambient temperature for the battery operation shall not be too high or
too low.
If the average operating temperature of the battery rises from 25°C to 35°C,
the service life of the battery will be reduced by 50%. If the operating
temperature of the battery is over 40°C, the service life of the battery will be
reduced exponentially each day
Short time
allowable
temperature
-15°C ~ 45°C
The higher the temperature is, the shorter the battery service life will be. At low temperature, the
charge/discharge performance of the battery will be significantly reduced.
The battery must be installed in cool and dry environment with the humidity less than 90%, and be
protected from the heat source and direct sunshine.
The ambient temperature, ventilation, space, float/boost charge voltage and ripple current will affect the
battery temperature. Uneven temperature among the battery strings will cause uneven voltage
distribution and thus result in problem. Therefore, it is very important to maintain balanced temperature in
the battery string, and the temperature difference between batteries of different layers shall be kept
within 3°C. Valve-regulated battery is very sensitive to the temperature, therefore the valve-regulated
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