In a recent Camping and Caravanning Club mag there is an article where many motorhomes have a built in alarm that when the 240v is unplugged or a power cut it sounds to warn of the fridge (and beer) is warming up. The writer uses this also as a security alarm by threading the hook up cable through bikes chairs etc at night. Anyone attempting to take anything would have to unplug the cable setting off his alarm!
Clever idea!
I have just bought a “power cut” alarm on ebay for £3.
Hope any non CCC member may find this useful as well
a collection of top tips, tricks and ideas, DIY improvements and motorhome modifications that can also be made to caravans, campervans and RVs. Many of these modifications I have made and used on our own motorhome but I have also listed other tips, advice and product reviews that I have found on the Internet including ideas for day trips and visits.
My Motorhome Mods .Online 
This is a pic of the device:-
When plugged in and switched on then if the power off then the alarm will sound.
LikeLike