SilentKnight 5820XL - Manual (Page 25)

LS10061-001SK-E Before You Begin Installation
3-6
3.6 Calculating Current Draw and Standby Battery
This section is for helping you determine the current draw and standby battery needs if you are using SK
addressable devices (Table 3-2) or SD addressable devices (Table 3-3).
3.6.1 Current Draw Worksheet Requirements
The following steps must be taken when determining 5820XL/5820XL-EVS current draw and standby battery
requirements.
1. You will use the Current Draw Worksheet to determine current draw and standby battery requirements. Use
Table 3-2 if installing SK SLC Devices and Table 3-3 if installing SD SLC Devices. For the 5820XL /
5820XL-EVS, the worst case current draw is listed for the panel, addressable devices, and all SBUS expand-
ers. Fill in the number of addressable devices and expanders that will be used in the system and compute the
current draw requirements for alarm and standby. Record this information in the Current Draw Worksheet on
Line A.
2. Add up the current draw for all auxiliary devices and record in the table on Line B.
3. Add up the current draw for all notification appliances and record in the table on Line C.
4. For notification appliances and auxiliary devices not mentioned in the manual, refer to the device manual for
the current ratings.
5. Make sure that the total alarm current you calculated, including current for the panel itself, does not exceed
6.0 A. This is the maximum alarm current for the 5820XL / 5820XL-EVS control panel.
If the current is above 6.0 A you will need to use a notification power expander(s) such as the Silent Knight
5495 or the 5895XL intelligent power expander, to distribute the power loads so that the 5820XL / 5820XL-
EVS or the power expanders do not exceed their power ratings. Refer to the current draw worksheets pro-
vided with the 5495 or the 5895XL manuals so you do not exceed their power ratings.
6. Complete the remaining instructions in the appropriate Current Draw Worksheet for determining battery size
requirements.
3.6.2 Current Draw Worksheet for SK SLC Devices
Use to determine current requirements during alarm/battery standby operation SK
SLC devices are installed. when SD SLC devices are installed. You can install up 99 SK detectors SD per loop
(396 points max per panel) and 99 SK modules per loop (396 points max per panel). Copy this section if
additional space is required.
Table 3-2 Current Draw Worksheet for SK SLC Devices
Device # of Devices Current per Device
Standby
Current
Alarm
Current
For each device use this formula: This column X This column = Current per number of devices.
Fire Panel (battery current draw) 1 Standby: 275 mA 275 mA
Alarm: 440 mA 440 mA