Alarm issue

[KLWinton]

I have a 2021 Elddis Encore 255. When on hook up and the alarm is set there is no issues. However if it’s not on hook up, after about 3 or 4 hours the alarm can go off. Siren goes, lights flash and difficult to reset. Any ideas what could be causing this?

TIA

 

[meanders]

Depends on the specific alarm but possibly the voltage falls away and it detects it as someone cutting the power. That's how our house alarm works, as indeed does the external sounder if you inadvertently drill through the cables from the control box. Don't ask how I know.