day
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, valve-regulated battery shall be used in 15°C ~ 25°C. If the battery cabinet is installed near the
UPS, the maximum design ambient temperature shall be determined according to the battery rather than the UPS.
That is, if valve-regulated battery is used, the indoor ambient temperature shall be 15°C ~ 25°C rather than the
operating temperature range of the main equipment. Under the precondition that the average temperature will not
exceed 25°C, it is allowed to have short time temperature deviation.
6.5.2 Number Of Batteries
Set the DC bus voltage and battery float charging voltage, which is usually 490Vdc, according to the rated input/output
voltage of the UPS, to ensure that the expected cell float charging voltage is 2.27V. The number of batteries, EOD
voltage, and float charging voltage under the 380V/400V/415V voltage system are consistent, as shown in Table 6-2.
Table 6-2 Number of batteries
6.6 Battery Protection
The UPS inside has a fuse switch to protect the internal battery. The Emerson BCB (optional) is recommended to
protect the external battery.
The external battery is connected to the UPS through the BCB. The BCB can be manually closed and has the
electronic tripping device controlled by the UPS control circuit. If the battery adopts rack mounting (or is far away from
the UPS cabinet), the BCB shall be installed as close to the battery as possible, and the wiring distance of the power
and signal cables connected to the UPS shall be minimized.
The BCB has the following features:
1) Isolated with the battery, safe and reliable
2) Short circuit protection
3) In case the inverter is locked because of battery under-voltage, the circuit breaker will be disconnected
automatically to avoid battery over-discharge
4) If remote EPO button is installed, the EPO button can be used to disconnect the circuit breaker
5) Mis-operation protection
To obtain the required backup time, the batteries may be connected in parallel. In this situation, the BCB shall be
installed in the after-stage of all the paralleled batteries.
Note
Only trained personnel shall operate and maintain the battery circuit breaker.
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