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How long do the batteries really last in the wirefree components?
The cost of the batteries can mount up if you quite a few components cant they?, how much do the batteries cost?
Are batteries normally included in the annual maintenance or they charged for as an extra?
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The detector battery's vary between systems. Some use alakaline AA or AAA size which are cheap to replace, others use lithium 3v batteries like a CR2 which seem to be about £4 each. But often last longer than a year so it averages out to a similar annual/monthly fee. I charge on average £20 per year extra for a wireless system but obviously this depends on the size of the system to get an exact figure.
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If batteries need replacing between services, can these be changed by anyone or does it require an engineer to do and re-programme? Is the extra cost of batteries still make it more feasible to go for wirefree compared to wired?
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If we install and maintain a system we guarantee that the detector batteries last until the next service. If they need changing in between that would class as a free callout from us although other companies may differ. Most systems these days require an engineer reset following a tamper fault. A tamper fault would occur if you tried to change the batteries (including the rechargeable control panel battery) on all systems including wired ones.
If you intend to have a system professionally installed, expect to have a maintinence plan. This will often be a small print clause in your home insurance policy anyway.
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You stated that it depends on the right equipment, which equipment is good? I have been quoted for a wirefree system manufactured by Risco, are they any good? In my house i will have about 9 PIR's and the quote given also included 3 wirefree vibration detectors. ( in total 12 components not including the keypad/siren which is better wired).
What issues are generally common to wirefree systems if any?
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Risco is okay, not my favourite but acceptable/good in some instances, it depends more on which Risco product as they have 4 or 5 different ways of doing wireless and one I wouldn't touch.
Keypad and siren being wired is quite common even on a wireless system. Wireless siren's have recently become available and are a good problem solver for difficult installs but not essential. Wireless keypads are also available as are remote setting devices (keyfobs).
I always try to sit down with my customers and prompt them with ideas of what we can achieve to suit them best (and conform with standards) and then pick the most suitable wired/wirefree/hybrid option for the property and the requirement.
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What issues are generally common to wirefree systems if any?
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The systems are pretty reliable if installed correctly. There are many installation pitfallls for the uninitiated/inexperienced (I have learn't the hard way). Things like foil coated plasterboard and metal studwork in modern houses can catch you out or thick walls in older property's. I once had to use 4 radio receivers on a large system because there were walls the radio couldn't get through (it was a big system, 40 zones, and the walls were upto a metre thick.) Definitely need to site survey to quote for all wireless installs.