Total Power Load; Battery Backup - semaphore KINGFISHER PLUS+ Hardware Reference Manual

IO Module 5 V Rail current consumption (mA from 5 V
Module
AI-1
AI-10
AO-2
AO-3
DI-5
DI-10
DO-1
DO-2
DO-5/6
IO-2
IO-3
IO-4
IO-5

3.4.3 Total Power Load

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The total current required to power the RTU is as follows:
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Total Power load is therefore:
• The Total Current Load for a PS-12/22 should not exceed 4.5 A.
• The Total Current Load for a PC-1 should not exceed 4 A. Loads greater than 4 A will
require a PS-12/22 supply to be installed.
• Users should be mindful of the current draw on the 5 V
Overload Check" chapter for more details.

3.4.4 Battery Backup

To maximise the service life of the battery, the depth of its discharge should not exceed 50%
of available capacity. E.g. for a 7 Ah battery, there is 3.5 Ah of backup power. Therefore the
battery can supply 3.5 Amps for 1 hour or 1 Amp for 3.5 hours etc.
The size of the backup battery required depends on how long the RTU needs to be able to
run without mains power. In addition to the Total Current Load above, a backup battery will
also need to power the PS-12/22 if present (not applicable if using a PC-1 processor).
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Kingfisher Plus+ Hardware Manual
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Page 60