7.7 UPS Battery
The UPS generally adopts valve regulated battery. Valve regulated means the sealed type or maintenance free.
The valve regulated battery is not completely sealed, when it is over charged, there is gas escape. The volume of the gas
escape is less than with a water injection battery. However, during the installation design of the battery, temperature rise
should be considered, and enough room must be reserved to ensure good ventilation.
The valve regulated battery is not maintenance free. The valve regulated battery must be kept clean, and inspected regularly
to check for corrosion and that the connection is reliable.
It is recommended to connect no more than 4 strings of batteries in parallel. Batteries of different types, names or newness
must not be used together. Otherwise, the battery inconsistency will cause frequent over discharge or under charge of certain
battery. At last, the battery will have premature failure, and the entire string of battery will have insufficient backup time.
Batteries must be stored in a fully charged state. Batteries will lose some capacity because of self discharge during
transportation or storage. Charge the battery before use. During the storage, ensure that the ambient temperature must not
exceed the range of -15 °C to +45 °C, and the optimal temperature is 20 °C to 25 °C. To compensate for the self discharge of
the battery during the storage, the battery must 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 testing the battery backup time onsite. The test may take several days.
Therefore, it should be conducted after the battery is float charged uninterrupted for at least 1 week.
When the battery is running for several weeks or subject to 2 to 3 charge and discharge cycles, the battery performance will
increase.
To avoid the battery over charge or under charge, 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. Charge
the battery immediately after discharge.
7.8 Precautions for Installation Design
NOTE: 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 precautions that must be
considered during the installation design. The design results may be changed according to the local situations.
7.9 Battery Installation Environment and Number of Batteries
7.9.1 Installation environment
7.9.2 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 must be satisfied:
Q=0.05 x n x I
gas
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
130 Proprietary and Confidential ©2023 Vertiv Group Corp. 7 Battery
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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