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Chapter 11: Battery Backup Calculation Worksheet
SP40S BATTERY CALCULATION SHEET
STANBY CURRENT CALCULATIONS
1. The Standby Current for the SP40S is 0.130 Amps.
______________Amps
2. Enter Auxiliary Current (If Applicable)
______________Amps
3. Add Steps 1 and 2. Multiply by the number of hours required.
24 Hours – Multiply by 24
TOTAL STANDBY CAPACITY IN AMP HOURS
______________Hrs
______________Ah
ALARM CURRENT CALCULATIONS
NOTE: DO NOT EXCEED 40 WATTS.
Good engineering practices call for amplifier to operate at 85% Max wattage.
1. List the speaker and strobe requirements.
NOTIFICATION
SPEAKER
STROBE
APPLIANCE
WATTAGE
CURRENT
2. Calculate total Strobe current. (2. Amps Max.)
3. Calculate total speaker wattage. (40 Watts Max.)
______________Amps
____________
4. Multiply the total speaker wattage on line 3 by 0.054.
______________Amps
5 Add Auxiliary Current (if applicable)
______________Amps
6. Add Steps 2,4 and 5 together. (4.66 Amps Max.)
______________Amps
7. Multiply Step 6 by 0.25 (This represents 15 minutes of alarm.)
______________ Hrs
8 Total Alarm Capacity in Amps-Hours.
______________ Ah
BACKUP BATTERY REQUIREMENS
1. Enter Standby Capacity.
______________ Ah
2. Enter Alarm Capacity.
______________ Ah
3. Add Steps 1 and 2 together.
______________ Ah
Multiply Step 3 by 1.1 for minimum Backup Battery Requirements
______________Ah
NOTE: THE UL LISTED BACKUP BATTERIES FOR THIS PANEL ARE TWO 12 VOLT,
12 Ah.
SP40S Multi-Function Facility Communication System Manual, Revision D
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