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FA-262 Installation & Operator’s Manual
7
2.8 Calculation for Standby Battery Requirement
Step
Device
Current per
device (mA)
Number
of device
Total
Standby
Current (mA)
Total Alarm
Current
(mA)
1
FA-262
Standby:
90
x 1
= 90
Alarm:
365
x 1
=
2
Zone 1
Standby:
x
=
Alarm:
69
x 1
=
69
Zone 2
Standby:
x
=
Alarm:
69
x 1
=
3
NAC 1
Alarm:
x
NAC 2
Alarm:
x
4
RTI-265
Standby:
15
x
Alarm:
15
x
RAM-265
Standby:
15
x
Alarm:
25
x
UDACT-286
Standby:
45
x
Alarm:
60
x
RM-263
Standby:
0
x
=
Alarm:
24
x
5
AUX+
Standby:
x
=
Alarm:
x
=
6
Total ‘standby’ and ‘alarm’ current:
mA
mA
7
Divide ‘standby’ mA and ‘alarm’ mA by 1000:
Amp
Amp
8
Select ‘standby’ time required (24 or 60 Hr.):
Hr.
9
Standby Amp-Hr. - multiply 8 × 7 = (Amps × Hr.):
Amp-Hr.
10
Select ‘alarm’ time required
(0.08 or 0.5)
:
Hr.
11
Alarm Amp-Hr. - multiply 7 × 10 = (Amps × Hr.):
Amp-Hr.
12
Total Amp-Hr = standby Amp-Hr (9) + alarm Amp-Hr. (11):
Amp-Hr.
13
Multiply the total Amp-Hr. by the safety margin:
1.20
14
Total battery Amp-Hr required to support the system:
Amp-Hr.
Note:
Select a battery with an Amp-Hr. rating that is equal to or larger than the calculated minimum Amp-
Hr. battery required.