can anyone give me a simple calculation (not an app) for calculating what size battery i require, taking in quiescent, in alarm and time of back up needed...ta
ive got some out there, and on the whole they are very good.
the only issue i have found is if your sab signal is low, it will drop in and out, causing it to continually poll, which the kills the batteries.
if you can hard wire the bell i would. apart from that no dramas