Appendix A: System calculations
EST3X Technical Reference Manual 251
mode. Multiply the total amount of standby current by the number of hours that
the panel is required to operate in standby mode while on battery power.
Determine the total amount of current in milliamps required by all of the
components that derive power from the battery while the panel is in alarm mode.
Multiply the total amount of alarm current by the number of minutes that the
panel is required to operate in alarm mode while on battery power. Divide the
result by 60 to convert minutes to hours.
Add the total amount of standby current and the total amount of alarm current
then divide the result by 1000 to convert to ampere-hours. Multiply this number
by 1.2 to add a 20% safety factor to the calculations.
Battery calculations
Battery capacity worksheet
Instructions: Enter the standby and alarm currents from the other worksheets, and then calculate the size of standby
batteries you need based on your operating time requirements.
Standby
current (mA)
Alarm
current (mA)
Total control panel current (from Worksheet A)
Total NAC current (from Worksheet B)
0
Total AUX current (from Worksheet C)
Smoke power [1]
Total current
Operating time required
× h × min
÷ 60
+ = mAh
× 1.2
mAh
÷ 1,000
Battery capacity
Ah
[1] A maximum of fifteen SIGA-UM or SIGA-MAB modules per signaling line circuit can be configured to support two-
wire smoke detectors (personality codes 13, 14, 20, and 21). For standby current, enter 2.0 mA for each smoke power
circuit used. For alarm current, enter 17.0 mA for each smoke power circuit used.
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