PeterJames

Very, just under the higher tax bracket, makes me wonder wtf I am not selling carrots and stuff

Funny you mention that I popped into my local Aldi today and they had signs everywhere You're not that far from us if you need sponsoring Id be happy to help

It depends on the panel not the detector its the panel instructions you need to read not the detectors.The panel is looking for a resistance coming back and it depends on which panel as to what resistance

Does it matter? cutting the wire would set the alarm off its a DIY system at the end of the day.

Grandfather rights still apply, our engineers are still obtaining ECS without formal qualifications.

LOL an alarm went of on our industrial estate and we were the only people interested, when we saw it wasnt one of ours we went back indoors.

And you're a water servant or p taker

back on topic I'm ltd

That would be your Chimp getting excited, personally I find it quite funny.

No I tink dats de way de yout talk inda smoke geez innit

Its more "innit tho"

Many people further south of London have cockney accents, nowadays. Most people I know that live and work in London sound sort of Jamaican with a bit of Greek ........innit.

QFA

https://www.grapheine.com/bombaytv/identity-en-8c1acdda2eb4bdbff3e28f994f9f489b.html

For a one off its cheaper to buy a new dvr as the kit will only reset the recorder if you can prove you own it. We always put an installer user and password on the recorders when we install them, it makes it easier when we come to service it, if the main user is not there, we dont have to make lots of phone calls to find out what the pw is, and often the customer forgets the pw so we can come and reset it for them, sometimes an employee leaves and he was the only one that new the pw so can we come and reset it. It just makes sooo much sense to have an installer password in the recorder.

Something like this would be better, its mains https://www.screwfix.com/p/nightwatcher-nw760b-16w-hd-cctv-wi-fi-camera-led-light-pir-black-8gb/4519T?kpid=4519T&ds_rl=1249481&ds_rl=1245250&gclid=EAIaIQobChMIia337LLS2AIVzLftCh10VAveEAQYAyABEgIP-PD_BwE&gclsrc=aw.ds&dclid=CMn19_Oy0tgCFeynUQodMuoPGA

Risco will also tell you that a battery in a wireless detector will last up to 3 years I have never known them last more than 18 months. I would never put a 7Ah battery in a panel with a 1amp PSU yep it will charge it, yep the battery will last far longer than a smaller one in a power cut, but those figures do not state the current needed to charge a flat 7Ah battery

You wouldnt really need the bells and whistles to ring for 12 hrs now would you

ie 200mA x 10 = 2Ah

Its hard to test the battery without a proper battery discharge tester. The best way to work out the battery size needed is to see what current the system draws and x that by 10 that will give you the minimum battery size required to last for 12 hrs, if you want need it to last longer add another PSU and battery rather than expecting the smaller panel PSU to cope.

Of course a transformer will wear out, they wear out in normal use let alone when they are being overloaded. Transformers are a moving part in your panel that's the bit that hums, they are vibrating the more they hum the more they are vibrating which is wear. But it also puts a strain on the components the bridge rectifier and diodes that go into making the charging circuit

As James says a flat 7Ah will draw more power than the PSU is designed to supply, therefore putting unnecessary strain on the transformer, eventually wearing it out. Its like using a Nissan Micra (Your PSU) to tow a fully loaded truck up a hill (Your battery) People often think that bigger is better without taking into account that the current required to charge it when its fully discharged.

Just another point I would not recommend installing a battery bigger than 3.4Ah the PSU is only about 1amp the current draw on a flat 7Ah will knacker the psu

Sounds like the panel is knackered then battery should have been replaced over ten years ago, in 2007 which is probably the reason the panel failed. As the battery dies it starts to pull more and more power, it eventually kills the charging circuit. New panel and battery, and as your bell did not ring when you down powered the panel, I would guess a new bell.

Whats the age of the battery? Have you tried powering up mains only?