IDR-2P, -2A & -6A Repeaters User Manual
Appendix 2 - Batter
y Calculations
A2 - 1
997-411-000-9, Issue 9
March 2008
Appendix 2 - Battery Calculations
During the quiescent period it is reasonable to assume that
the minimum voltage from the battery will be 24V for the vast
majority of the time. On this premise the 24V supply figure
can be used for all systems during this period.
In alarm the final battery voltage may fall to 19V. Allowing up
to 1V for cable and other losses, the worst-case supply voltage
for non-boosted systems may be as low as 18V. This results
in higher currents in alarm for these systems.
At present, Notifier Panels/PSUs fall into the following groups:
Boosted: ID2000, ID2008, ID/NF3000, NF300
Non-Boosted: ID50, ID1000, PS2, PS2/CMX
A non-boosted panel/PSU will require the following battery
capacity to support the IDR Repeater:
C = (T x Iq + Ia) x 1.25
where:
C is the calculated battery capacity in Ampere-Hours
T is the required battery backup time in Hours
lq is the IDR repeater quiescent current in Amperes
la is the IDR repeater alarm current in Amperes
1.25 is a multiplying constant to comply with LPS1014
If connected to the auxiliary output of a boosted panel the
efficiency of the panel’s booster must be allowed for. Notifier
recommend using the Loop and Battery Calculator Tool to
calculate the total battery capacity required. An approximation
can be obtained by multiplying the currents given below by
1.7.
The currents (excluding Isolated RS232 Board) at the above
voltages are:
IDR-2A/-2P
@18V
@24V
Quiescent
90mA
80mA
Alarm
120mA
100mA
IDR-6A
@18V
@24V
Quiescent
90mA
80mA
Alarm
155mA
125mA
If an Isolated RS232 Board is fitted, add 5mA to these values.
When calculating the battery requirements it is recommended
that the 18V alarm current and the 24V quiescent current be
used.
