Calculating the battery power requirements
Installation & Configuration Manual
Powering expanders from the auxiliary power terminals
Auxiliary 12 V power terminals
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.
Battery size = Capacity, in Ah, depending upon SPC enclosure chosen
Time = backup time, in hours, depending upon Security grade
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