On 07/10/2019 05:30, Andy Burns wrote:
Just had a power cut (70 minutes not too bad a fix time for an 11kV
fault I suppose)

OK, I did have to get up to silence the UPS (also shut down a couple of
unnecessary PCs while at it to extend runtime)

But most annoying is the 15 minutes of alarms sounding due to failed
batteries, then sounding again for another 15 minutes when the power
comes back ...

People seem to think this is normal/acceptable ...

Some alarms use capacitors these days, others still use rechargeable
batteries, which decline with age. Alarms going off once in a while for
power-cuts are probably better than every housholder testing their alarm
and whether the battery has enough power to run the siren for the
alloted time, all on different days and times.

SteveW