Safety Bus Manual — P/N LS10177-000HI-E:B 02/21/2019 18
Local Power Supplies Introduction
2.8.2 Calculating Battery Capacity
In accordance with European and US standards, the operation time without a primary power is:
• Standby = 24 hrs.
• Alarm* = 5 minutes (0.083 hrs.)
*Note: If releasing service is employed by the panel, one (1) additional minute of alarm in addition to the releasing loads must be taken into
consideration.
Use the table below to calculate the battery capacity to use.
• Calculate the battery capacity in standby (A4)[Ah]=(A3) x 24 [Hours].
• Calculate the battery capacity in alarm (B4)[Ah]=(B3) x 0,083 [Hours].
• Calculate the total battery capacity [Ah]=A4+B4.
• Multiply the total capacity by a derating factor of 1.2.
• The product of the multiplication indicates the minimum required battery capacity.
• Select a type of battery with a capacity that is equal to or greater than the one calculated.
Total System Standby Current= (A3) A
x Standby Time 24 Hours
Standby Battery Capacity= (A4) Ah
Total Alarm Current= (B3) A
x Alarm Time 0.083 Hours
Alarm Battery Capacity= (B4) Ah
Total Calculated Battery Capacity= A4+B4 Ah
x Derating Factor= 1.2
Battery Size Needed= C Ah
Table 2.3 Calculating Battery Size
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