"John G" wrote in message
...

I have a mains powered timer in Aus (230v 50hz) which has an internal
battery and keeps time without the mains so the electronics does not
require 50hz.
Relay operation may another thing, I have never tried to see if it would
operate without the mains available.

I assume you know there are a bunch of electronics distributors in Sydney
and Melbourne who may have a 12 VDC unit you can use? Maybe even Dick Smith
or Tandy?