7.3 UPS Battery
The UPS adopts valve-regulated battery. At present, 'valve-regulated' means the 'sealed type' or 'maintenance free' mentioned
in the past.
The valve-regulated battery is not completely sealed, especially when it is over-charged, there will be gas escape. The volume
of the gas escape in the valve-regulated battery is less than flooded battery (water injection battery). However, during the
installation design of the battery, temperature rise shall be taken into account, and enough room shall be reserved to ensure
good ventilation.
Besides, the valve-regulated battery is not maintenance free. The valve-regulated battery must be kept clean, and it shall be
inspected regularly to check if the connection is reliable, and if it is corroded. For details, please refer to Battery Maintenance.
It is recommended to connect no more than 4 strings of batteries in parallel. Batteries of different types, names, or newness
shall 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.
The battery must be stored in a 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 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 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.
7.4 Precautions for Installation Design
N O T E: Precautions for installation, use, and maintenan ce of the battery are d escribed in the relevant
battery m anual provided by the battery m anufacturer. T he safety precautions describ ed in this
section include the im portant m atters that m ust be considered durin g the installation d esign. The
desig n results m ay be changed according to the local situations.
7 Battery
114
Vertiv™ Liebert® APM Plus User Manual
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