Matrix 832 / 832+ / 424
Page 4 RINS428-5
1.2 Battery Capacity Calculations
Maximum Battery recharge time must not exceed 72 hours to satisfy EN50131-6.
1.2.1 UK Requirements
In the event of mains failure BS4737 Part 1, Section 7.2.1, specifies that a stand-by battery should be able to
power the system for a non-alarmed period of 8 hours. The typical Local Authority specified maximum bell
alarm period is 20 minutes.
Example Calculation
Non-alarmed condition 7 hrs 40mins = 7.67Hrs:
Control panel 0.130A
Keypad 0.015A
Detectors (8 detectors at 15mA each) 0.120A
External sounder 0.050A
External strobe 0.000A
Total current 0.315A
Amp/hour capacity 0.315A x 7.67h = 2.41Ah
Alarmed condition 20mins = 0.33Hrs:
Control panel 0.130A
Keypad 0.015A
Detectors (8 detectors at 15mA each) 0.120A
External sounder 0.350A
External strobe 0.150A
Total current 0.765A
Amp/hour capacity 0.765A x 0.33h = 0.25Ah
Minimum battery capacity = 2.41A + 0.25A 2.66Ah
WARNING: Consult each product’s instructions for the actual current values.
1.2.2 Norwegian & Danish Requirements
Required capacity = (18 x A) + (0.5 x B)
Where:
A = Maximum non-alarmed total system current.
B = Maximum alarmed total system current.
1.2.3 Swedish Requirements
Required capacity = 12 x A
Where:
A = Maximum total system current.
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