P/N RE - 102 / 104 Rev. No. 0
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Chapter 6: Battery Calculation
Normal Condition :
X = S (Amps) x ____ Hrs. (Backup time
required)
Alarm Condition
:
Y = F (Amps) x ____ Hrs. (Backup time
required)
Battery Ah required :
AH = (X + Y) x 1.2 (Derating Factor).
Note: Refer specification (Page 10) for Quiescent, standby, alarm
currents
System current (S) = Quiescent C
(Standby current X No. of zone)
Fire current (F) = (Alarm Current x no. of zones) +
(Hooter Current x No. of Hooter).
Example: (4 Zone with 48 Hrs in normal condition & 1 Hr in Alarm condition)
S = 0.060A + (0.0068A X 4) = 0.0872A
F = (0.035A X 4) + [0.2 X 4(no. of sounder)] = 0.94A
X = S (0.0872A) x 48 Hrs. = 4.1856
Y = F (0.94A) x 1 Hrs. = 0.94
AH = X+ Y = (4.1856 + 0.94) X 1.2 = 6.15072 Ah
