Battery Capacity Calculations
P/N 06-236716-001 A-3 August 2007
A-4 BATTERY CAPACITY CALCULATIONS
Based on the “Duration” for which battery backup is required (refer to Paragraph A-1) and the
Total Standby Power and Total Alarm Power values (refer to Paragraph A-3), the next step
is to calculate the battery capacity in Ampere-Hours (AH) using Table A-4.
Note: 1. The above battery capacity calculation and subsequent selection assumes that the
battery is installed in ambient room temperatures. If installed in below ambient, consult
the battery manufacturer for requirement of additional deration factors not considered
above.
2. 5 minutes = 0.083 hours
10 minutes = 0.167 hours
Table A-4. Battery Capacity Calculations
Total Power Required (Amps)
Multiply
By
Duration
(Hours)
Equals Ampere-Hour (AH)
Total Standby Current (Amps) = x =
Total Alarm Current (Amps) = x =
Total Calculated AH (column sum) =
Required Battery AH using 110% Deration Factor
(multiply Total Calculated AH by 1.1)
=
Selected Battery Capacity
(must be greater than or equal to required battery AH and lower than 68 AH)
=
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