Calculating Current Draw And Standby Battery - Honeywell ECS Series Installation And Operation Manual

ECS Series Emergency Communication System Installation Manual
4.8.12

Calculating Current Draw and Standby Battery

This section helps you determine the current draw and standby battery needs for your installation (18
Ampere Hours maximum will fit in cabinet). Complete the remaining instructions in Table 4-8.
Batteries larger than 18 AH will not fit in the main control cabinet, and must be housed in the RBB
Accessory Battery Cabinet. Maximum of 35 amp hr for the system.
Device
ECS-DUAL50W 25V
ECS-DUAL50W 70.7V
ECS-50WBU
A
Notification Devices
B
C Total current rating of all devices in system (Line B) X 0.001
D Number of standby hours (24 or 60 for NFPA 72)
E Multiply line C (standby current) and D:Total standby AH
F Alarm sounding period in hours (For example, 5 minutes = 0.0833 hours):
G Multiply line C (alarm current) and F:Total alarm AH
H Add lines E and G (AH = Ampere Hours):Total AH required
Table 4-8: Current Draw ECS-DUAL50W
No. of
Devices
1 Standby:
Alarm:
1 Standby:
Alarm:
1 Standby:
Alarm:
Refer to device manual for number of devices and current ratings.
4-56
Current Per Device
110 mA
1.2 A
110 mA
1.4 A
40 mA
110 mA
Current Subtotals:
Current Subtotals:
151455
Standby Alarm
Current Current
110 mA
1.2 A
110 mA
1.4 A
40 mA
110 MA
mA mA
mA mA
A A
H
AH
H
AH
AH