4: Maximum Battery Standby Load - Honeywell 6820 Manual

Calculating Current Draw and Standby Battery
1 The FACP can only support 5 devices with LEDs on. The current draw has been added to the panels alarm current.
2 Total does not include isolator devices or accessory bases
3 If using 24 VDC aux power only. No standby or alarm current is needed for battery calculation if using 24 VAC, 120 VAC, or 240 VAC.
4 Maximum SBUS address capacity is determined by the amount of SBUS bandwidth consumed by each SBUS module. Refer to
Section 4.6.2 for SBUS limitations.
5 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 1.0A total current that can be drawn from
the panel.
6 Use next size battery with capacity greater than required.
3.5.4 Maximum Battery Standby Load
Tables 3.4 and 3.5 show the standby load calculations for the 6820 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 Tables 3.4 and 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 3.5 Maximum Battery Standby Loads for 90 Hour Standby (FM applications only)
WARNING: BATTERY SIZE
!
SILENT KNIGHT DOES NOT SUPPORT THE USE OF BATTERIES SMALLER THAN THOSE LISTED IN TABLES 3.4 AND
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.
6820/EVS Manual — P/N LS10144-001SK-E:E 4/6/2022
Rechargeable 24 hr Standby,
Battery Size 5 mins. Alarm
17AH 535 mA
18AH 569 mA
24AH 769 mA
33AH 1.07A
35AH 1.14A
40AH 1.30A
55AH 1.80A
Table 3.4 Maximum Battery Standby Loads for 24 Hour Standby
Rechargeable 90 hr Standby,
Battery Size 5 min alarm
33 AH N/A
40 AH 347 mA
55 AH 480 mA
24 hr Standby, 24 hr Standby,
15 min alarm 20 min alarm
473 mA 442 mA
506 mA 475 mA
706 mA 675 mA
1.01A 975 mA
1.07A
1.24A
1.74A
90 hr Standby, 90 hr Standby,
15 min alarm 20 min alarm
N/A
331 mA 322 mA
464 mA 456 mA
Before You Begin Installation
1.04A
1.21A
1.71A
N/A
25