54 Reserve power
The float and equalization voltages defined in Table 19 are not an exact
requirement as long as voltages do not exceed -56.5 V. See Table 7 in “DC
power description.”
Not all sealed cells require equalization, but the equalization voltage can be
used for fast charging.
Batteries to be used with the SL-1 should be sized by using an end voltage of
4IV.
The noise limitations for a battery string are:
-
20 mV rms maximum ripple
-
32
dBmC
maximum noise
End cells and CEMF cells are not recommended because they are a noise
source.
I.
Other considerations
-Planned growth
-
Backup time required
-
Existing power system capability
-
Space and thermal conditions
-
Other equipment, lights, alarm systems
Power engineering
553-3001-152
s,