Chapter 11 - Battery Backup Calculation Work Sheet - Wheelock SAFEPATH4 Application, Installation, Operation, And Maintenance Manual

BATTERY BACKUP CALCULATION WORKSHEET
STANDBY CALCULATIONS
1. Standby Current for the SPB is 0.120 Amps.
2. Auxiliary (DC OUT) Current (if applicable). 0.5A Max.
3. Total Standby Current Required. Add Steps 1 and 2.
4. Standby Time Required. 24 Hours or 60 Hours.
5. Total STANDBY Required. Multiply Steps 3 and 4.
ALARM CALCULATIONS
Good engineering practices call for each amplifier section to operate at 80% Max wattage.
6. Audio Output Power for AUD1 OUT. 80W Max.
7. Audio Output Power for AUD2 OUT. 80W Max. (SPB-160)
8. Total Audio Output Power. Add Steps 6 and 7.
9. Conversion Factor for Audio Power to DC Amps.
10. Total Audio Current Required. Multiply Steps 8 and 9.
11. Auxiliary (EXP OUT) Current (if applicable). 0.5A Max.
12. Strobe Output Current for STB1 OUT. 2A Max. (SPB-80/4)
13. Strobe Output Current for STB2 OUT. 2A Max. (SPB-80/4)
14. Total ALARM Current. Add Steps 10, 11, 12 and 13.
15. Alarm Time In Hours. 15Min = 0.25Hrs, 5Min = 0.083Hrs
16. Total Alarm Required. Multiply Steps 14 and 15.
BACKUP BATTERY REQUIREMENT
17. Total STANDBY and ALARM Required. Add Steps 5 and 16.
18. Safety Factor Multiplier.
19. Minimum Backup Battery Requirement. Multiply Steps 17 and 18.
NOTE: The Battery Charger In The Audio Booster Can Provide A Maximum Current of 0.5Amps.
0.120 A
A
A
X Hrs
W
W
W
X 0.054
A
A
A
A
A
X Hrs
AH
AH
AH
X 1.1
AH
Ampere Hours
63