Instruction manual

3-21
Standby Current
The standby current consumes the largest part of the storage battery capacity. The standby
current of the SP40/2
panel is 0.125 Amp-hours. Multiply this value by the number of standby
hours required. Normally this is 24 or 60 hours. This represents the total Standby current in amp-
hours for the panel.
Alarm Current
The maximum alarm current for the SP40/2 panel is 4.30 Amps (1.6 Amps for audio, 2.0 Amps for
strobe, and 0.5 Amps for auxiliary power).
1. Calculate strobe circuit output current by adding the current draw of all strobes. Current draw
will be in amp-hours.
2. Calculate speaker output circuit current by totaling all the speaker wattage settings. Multiply
the sum by .040. The result will be the current draw in Amps-hours.
3. Add the strobe circuit output current and the speaker output circuit current together. The
results will be the total alarm current in amp-hours.
Alarm circuits are required to operate for 15 minutes on battery power. Multiply Step 3 by 0.25.
The result is the total alarm current in amp-hours.
Battery Calculations
Good engineering practices recommend the total Amp-hours required for backup should
not exceed 80% of the Backup Battery capacity. The SP40/2 has been UL approved for
12Ah batteries.
1. Add the total Standby Current to the total Alarm Current.
2. Multiply Step 1 by 1.25. This is the minimum Backup Battery requirement for this panel.
3. Record results on worksheet.
Section 3-9 - AC Power and Battery Installation Procedures
NOTE: Power limited and non-power limited wiring must be separated. Non-power limited
wiring (AC power and battery) shall be wired to the left of the motherboard. Power limited
wiring shall be wired to the right of the motherboard.
WARNING: TWO DIFFERENT SOURCES OF POWER MAY BE CONNECTED TO THIS
UNIT. DISCONNECT BOTH SOURCES OF POWER BEFORE SERVICING. FAILURE TO
DISCONNECT BOTH POWER SOURCES BEFORE SERVICING COULD RESULT IN
PROPERTY DAMAGE, SERIOUS INJURY, OR DEATH TO YOU AND/OR OTHERS.
WARNING: OBSERVE CORRECT POLARITY REQUIREMENTS ON ALL CONNECTIONS.
FAILURE TO DO SO MAY DAMAGE THE EQUIPMENT.
WARNING: ALWAYS APPLY AC VOLTAGE BEFORE APPLYING BATTERY BACKUP
VOLTAGE. FAILURE TO DO SO MAY CAUSE DAMAGE TO THE SP40/2 PANEL.