ECS Series Manual — P/N 151455:H 2/15/2022 35
Installing the ECS-125W ECS Device Installation
4.5.6 Calculating Current Draw and Standby Battery
This section helps to determine the current draw and standby battery needs for your installation. These capacities have a built-in 20% derat-
ing factor. Complete the remaining instructions in Table 4.2.
Batteries larger than 18 AH will not fit in the main control cabinet, and must be housed in the RBB Accessory Battery Cabinet. The system
supports a maximum of 33 AH batteries.
4.6 Installing the ECS-125W
This section provides information on how to install the ECS-125W for use with ECS series products.
Device
No. of
Devices
Current Per Device
Standby
Current
Alarm
Current
ECS-INT50W 25V 1 Standby: 52 mA 52mA
Alarm: 275 mA 275mA
ECS-INT50W 70V 1 Standby: 52 mA 52mA
Alarm: 310 mA 310mA
A Current Subtotals: mA mA
Notification Devices Refer to device manual for number of devices and current ratings.
B Current Subtotals: mA mA
C Total current rating of all devices in system (Line B) X 0.001 A A
D Number of standby hours (24 or 60 for NFPA 72) H
E Multiply line C (standby current) and D: Total standby AH AH
F Alarm sounding period in hours (For example, 5 minutes = 0.0833 hours): H
G Multiply line C (alarm current) and F: Total alarm AH
AH
H Add lines E and G (AH = Ampere Hours): Total AH required AH
Table 4.2 Current Draw Calculations
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