Goodaye all
Had to replace the battery in my garage alarm today and thought l should pass it on.
l have in my garage a modified car alarm that runs on 12v from a car battery.
Covers all the doors and windows.
Being a car alarm l have remotes that l use to arm and disarm it, l also have a keyed master switch in a wall that also can switch it off.
The battery is usally one that is on the way out, having 4 cars it gets swaped out regulary and every month or so l throw the charger on it.
Seems to last well.
Being detached from the house l turn the power off as l finish for the day.
You could use a 12v power pack but this could set the alarm off. if the power goes out.
A solar charger is also no good as it also will trip most alarms.
Its only a basic alarm you need, think it cost me $80, l wont tell the brand if you dont mind.
Now for a hanger you could use a car alarm that has a sim card and ring you when it goes off, once again you dont need mains power.
This would be a more upmarket setup, but would be cheap and reliable.
Or you could use the cheaper setup that would just make noise to scare them off.
l have had it for over 10 years protecting my cars and now my plane build.
If people are interested l get do a general diagram.
PS Ff any body has old Cobra car alarm bits l would be interested in them.
regards Bruce