23
Appendix
Calculating the battery power requirements
334
Vanderbilt
Installation & Configuration Manual
A6V10276959
01.05.2016
Powering expanders from the auxiliary power terminals
1 SPC controller
2 Battery
3 Auxiliary 12 V power terminals
4 Keypad
5 Keypad
6 I/O expander
23.4
Calculating the battery power requirements
It is important that adequate stand-by power is available to supply all devices in the
event of a mains supply failure. To ensure that enough power is available, always
connect the appropriate back-up battery and PSU.
The table below gives an approximation of the maximum load current that can be
drawn from each type of battery over the given stand-by periods.
The approximations below assume that the SPC controller PCB is drawing its
maximum load (all wired inputs have their EOL resistors fitted) and that the usable
output power from the battery is 85 % of its maximum capacity.
0.85 x battery size (Ah)
-
(Icont + Ibell)
=
Imax
Time (hours)
Battery size = Capacity, in Ah, depending upon SPC enclosure chosen
Time = backup time, in hours, depending upon Security grade
JP9
+
–
1
3
4
5
6
2
Содержание SPCK620
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