Determining the correct battery size for your POTTER FFT-1000 Fire Fighter Telephone Panel is crucial for reliable operation. Follow these steps, referencing the battery calculation worksheet in Appendix A of the installation manual, to ensure you select the right battery: 1. Identify Standby and Alarm Currents: Find the standby and alarm current draw in milliamps (mA) for each component connected to the panel, including the FFT-1000, FSB-8, FSB-24, and FFT-EXP. These values are detailed in the manual. 2. Calculate Total Standby and Alarm Currents: Sum the standby currents to find the total standby current and add the alarm currents to find the total alarm current. 3. Convert Currents to Amps: Convert the total standby and alarm currents from milliamps to amps by multiplying each value by 0.001. 4. Determine Standby and Alarm Times: Establish the required standby and alarm durations for your system. Calculate the total standby Ampere-hours (AH) by multiplying the standby current in amps by the standby hours and dividing by 60 (minutes per hour). Similarly, calculate the total alarm AH using the alarm current and the alarm time. 5. Consider Efficiency Factor: Apply an efficiency factor by dividing the total AH by 0.80. This accounts for battery performance characteristics. 6. Check Maximum Allowable Standby Current: Consult the manual for the maximum allowable standby current values based on the AH rating. Ensure the total current does not surpass the power supply's 5.0A rating. 7. Select Battery Size: Based on the calculated AH requirement, choose a listed or recognized sealed lead acid battery or equivalent. The battery capacity should meet or exceed the calculated AH value. Remember that the panel cabinet can accommodate up to two 18 AH batteries. This process, using the manual's worksheet, ensures you select a battery that meets the specific standby and alarm time requirements of your POTTER FFT-1000 Fire Fighter Telephone Panel.
