Comments on: Alarm system (Battery backup problem)? http://www.batterybackupguide.com/blog/alarm-system-battery-backup-problem/ Thu, 17 May 2012 20:56:27 +0000 http://wordpress.org/?v=2.7 hourly 1 By: Brad http://www.batterybackupguide.com/blog/alarm-system-battery-backup-problem/comment-page-1/#comment-2436 Brad Mon, 14 Dec 2009 08:38:08 +0000 http://www.batterybackupguide.com/blog/alarm-system-battery-backup-problem/#comment-2436 It's not possible to answer your question without a lot more detail (age of the battery, current draw for each device, etc...). But I can give you some generalizations. If the battery is older than 3 years, I doubt its capacity is anywhere near what it was when it was new. That many powered sensors will put a heavy drain on a system (the outside beams are the real killer). Also depending on how many keypads you have, if they are set to backlight all the time, etc... I wouldn't expect your backup time to be very long under these conditions (maybe 30 to 60 minutes) - if battery is in OK shape. Batteries are fairly cheap. If it will fit in the enclosure, I would get at least a 12V/18AH battery w/.250 terminals. If you have the room and don't mind changing the terminals out, you could get a 12V/35AH battery that uses nut & bolts. Although the recharge time from your alarm panel might become quite long itself. Another thing I would consider is powering those outside beams with thier own power supply. That will allow your internal security to stay up and running all day if it needed to.<a href="http://www.premierhomestyle.com/birdhouses-feeders-1591"> Brad</a> It’s not possible to answer your question without a lot more detail (age of the battery, current draw for each device, etc…).
But I can give you some generalizations. If the battery is older than 3 years, I doubt its capacity is anywhere near what it was when it was new. That many powered sensors will put a heavy drain on a system (the outside beams are the real killer). Also depending on how many keypads you have, if they are set to backlight all the time, etc…
I wouldn’t expect your backup time to be very long under these conditions (maybe 30 to 60 minutes) - if battery is in OK shape.

Batteries are fairly cheap. If it will fit in the enclosure, I would get at least a 12V/18AH battery w/.250 terminals. If you have the room and don’t mind changing the terminals out, you could get a 12V/35AH battery that uses nut & bolts. Although the recharge time from your alarm panel might become quite long itself.
Another thing I would consider is powering those outside beams with thier own power supply. That will allow your internal security to stay up and running all day if it needed to. Brad

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