Power Supply Calculations
Battery Calculations
34
ACPS-2406 PN 51304:B 09/02/2003
5.2 Battery Calculations
Table 5.6 sums the standby and alarm loads to arrive at the battery size, in Ampere Hours (AH),
required to support the ACPS-2406. The ACPS-2406 can charge batteries from 7 to 25 AH. Select
batteries that meet or exceed the total AH calculated in Table 5.6.
Table 5.6 Ampere Hour Calculations
Note:
1. Battery size is limited to 7.0 AH minimum to 25.00 AH maximum using the internal ACPS-2406 battery charger.
2. For battery sizes greater than 25.0 AH, disable internal charger by setting SW3.7 to OFF and use an external battery
charger.
L
OAD
T
OTALS
M
ULTIPLY
B
Y
T
IME
E
QUALS
S
ECONDARY
A
MP
H
OUR
T
OTALS
Enter Standby Current
(Amps) Total from
Column A
X
Enter Required
Secondary Standby
Time in Hours
=
(1) Secondary
Standby Amp
Hour Requirement
Enter Alarm Current
(Amps) Total from
Column B
X
Enter Required Fire
Alarm Time in Decimal
Form*
=
(2) Secondary
Fire Alarm Amp
Hour
Requirement
Add (1) and (2) Secondary Standby and Alarm Totals
Multiply by the Derating Factor of 1.2
X 1.2
=
Total Ampere
Hours (AH)
Required
* Following are decimal conversions for standard numbers of minutes:
5 minutes
10 minutes
15 minutes
60 minutes
120 minutes
0.084
0.167
0.250
1.0
2.0
