Maximum Battery Standby Load - Honeywell 6820EVS Installation And Optimization Manual

LS10144-001SK-E
Device
H Alarm sounding period in hours. (For example, 5 minutes = .0833 hours)
I Multiply lines E and H.
J 4
Add lines G and I.
Multiply by the Derating Factor
1. The FACP can only support 5 devices w/LED's on. This current draw has been added to the panels alarm current.
2. If using 24 VDC aux power only. No standby or alarm current for battery calculation if using 24 VAC, 120 VAC or 240 VAC.
3. If using door holders, you do not need to consider door holder current for alarm/battery standby, because power is removed during
that time. However, during normal operation, door holders draw current and must be included in the 6.0A total current that can be
drawn from the panel.
4. Use next size battery with capacity greater than required.
5. Total does not include isolator devices or accessory bases.
3.7.4

Maximum Battery Standby Load

Table 3-4 and Table 3-5 show the standby load calculations for the 6820 / 6820EVS based on 24 and 90 hours of
standby. The standby load calculations of line D in the Current Draw Calculation Worksheet must be less than
the number shown in Table 3-4 and Table 3-5 for the selected battery size, standby hour and alarm time. The
numbers below have a built in 20% derating factor for the battery amp-hour capacity.
Table 3-4: Maximum Battery Standby Loads for 24 Hour Standby
Rechargeable
Battery Size
Table 3-5: Maximum Battery Standby Loads for 90 Hour Standby*
Rechargeable
Battery Size
33 AH
40 AH
55 AH
Honeywell Silent Knight does not support the use of batteries smaller than those listed in Table 3-4 and Table 3-5. If you
use a battery too small for the installation, the system could overload the battery resulting in the installation having less
than the required 24 hours standby power. Use Table 3-4 and Table 3-5 to calculate the correct battery amp hour rating
needed for your installation. It is recommended that you replace batteries every five years.
*For FM Installation only
Table 3-3: Current Draw Worksheet for SD SLC Devices
# of Devices
24 hr Standby,
5 mins. Alarm
17AH
18AH
24AH
33AH
35AH
40AH
55AH
90 hr Standby,
5 min alarm
N/A
347 mA
480 mA
Current per Device
Total alarm AH
Total ampere hours
24 hr Standby,
15 min alarm
90 hr Standby,
15 min alarm
N/A
331 mA
464 mA
Warning
3-12
Before You Begin Installation
Standby
Current
AH
x 1.25
required
24 hr Standby,
20 min alarm
90 hr Standby,
20 min alarm
N/A
322 mA
456 mA
Alarm
Current
H
AH