Determining The Battery - Siemens FC2025 Manual

Determining the Battery

9.3
CALCULATING BATTERY CAPACITY
K = (I
Batt
K Battery capacity in [Ah]
Batt
I Total operating current of all consumers in quiescent condition [A]
R total
1 Total operating current of all consumers in alarm status [A]
A total
t Emergency power time desired in quiescent condition [h]
R
t Emergency power time desired in alarm status [h] (standard 0.5 h)
A
Correction coefficient for discharge
K
dis
K
dis
longer emergency power times.
Correction co-efficient for aging
K
age
EXAMPLE
K = (I
Batt
For 12 h emergency power time:
= ((0.9 A * 12h) * 1.1 * 1.25) + ((3.5 A * 0.5 H) * 1.1 * 1.25) = 17.2 Ah
For 24 h emergency power time:
= ((0.9 A * 24h) * 1.25) + ((3.5 A * 0.5 H) * 1.25) = 29.2 Ah
For 72 h emergency power time:
=(0.9 A * 72h) + (3.5 A * 0.5H) = 66.5 Ah
NOTE: Refer to the Section 10 and 11 (Periboard) for Power Supply and Battery parameter settings
and connections.
Siemens Industry, Inc.
Building Technologies Division
* t + 1 * t ) * K
R total R A total A
= 1.1 with emergency power time ≤ 12 hours. The coefficient can be ignored for
K = 1.25 if the emergency power time desired is ≤ 24 h. In all other cases,
age
the co-efficient can be ignored.
* t + 1 * t ) * K
R total R A total A
FS20 Marine Fire Detection Control Panel
* K
dis age
* K
dis age
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