SilentKnight EVS - Manual (Page 57)

EVS Device Installation
LS10062-001-SK-E 4-35
4.6.9 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 4-4.
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.
Table 4-4: Current Draw Calculations
Device
No. of
Devices
Current Per Device
Standby
Current
Alarm
Current
EVS-125W 1
Standby: 375 mA 375 mA
Alarm: 700 mA 700 mA
EVS-CE4 0 or 1
Standby: 20 mA
Alarm (All Channels): 180 mA
mA
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