Powering expanders from the auxiliary power terminals
1 SPC controller
2 Battery
3 Auxiliary 12V 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 following tables give 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 housing chosen
SPC4xxx/5xxx/6xxx – Installation & Configuration Manual Appendix
© Vanderbilt 2018 364 A6V10276959-d
11.2018
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