Installation manual

Installation Manual

150933 / Rev. 9/96 9

Table 4-2. Battery Calculation Worksheet

Device Number

Devices

Current per Device Standby

Current

Alarm

Current

For each device use this formula: This column X This column = Current per number of devices.

5395 Distributed Power Module 1 Standby: 75 mA 75 mA

(Current draw from battery) Alarm: 100 mA 100 mA

5395 Current

75 mA 100 mA

Auxiliary Devices Refer to device manual for current ratings.

Alarm/Standby mA mA mA

Auxiliary Devices Current

mA mA

Notification appliances Refer to device manual for current ratings.

Alarm: mA 0 mA mA

Notification Appliances Current

0 mA mA

D Total current ratings of all devices in system (line A + line B + line C) mA mA

E Total current ratings converted to amperes (line D x .001): A A

F Number of standby hours (24 or 60 for NFPA 72, Chapter 1, 1-5.2.5). H

G Multiply lines E and F. Total standby AH AH

H Alarm sounding period in hours.

(For example, 5 minutes = .0833 hours.)

I Multiply lines E and H. Total alarm AH AH

J Add lines G and I. Total standby and alarm AH AH

K Multiply line J by 1.20. (20% extra insurance to meet desired performance)

Total ampere-hours required