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 Post subject: Lighting timers, sunset
PostPosted: Fri Aug 25, 2017 8:45 pm 
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Hi all,

I have some external decorative lights (up/down lighters) on my house that are currently on a Kingshield timer. It does the trick but it's a bit of a fiddle to program and as the nights draw in I'll need to change it a few times to come on at the right time.

I'm wondering if there's any product available that automatically tracks the sunset? I have something similar on an IoT smart plug, but I've not seen anything similar for an electrical timer. Does anyone know if such a product exists or am I dreaming?

Thanks!


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PostPosted: Fri Aug 25, 2017 8:48 pm 
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http://www.screwfix.com/p/standalone-ph ... 7QodmtgDfw

Read the reviews. Somebody has a timer connected as well/


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PostPosted: Fri Aug 25, 2017 8:50 pm 
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I've moved this to Lighting.


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PostPosted: Fri Aug 25, 2017 8:56 pm 
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I have a couple of them. If you have a timer too, you have to wire the photo cell in AFTER the timer (You don't have to but otherwise you have to use relays, and a box and it gets messy) Then when the timer says come on, it powers the photo cell, and if the photo cell says its dark the lights come on.
If the photo cell says its too light the lights will not come on until its dark enough.

By using a timer and a photocell the lights will come on at a specific time, but they will also switch off at a specific time (say 00:00)

The down side is that if it is light and the timer says come on, the lights will come on for around 1 minute while the photocell warms up (It really does warm up because it uses a small heater and bi metallic strip)

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PostPosted: Fri Aug 25, 2017 10:03 pm 
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someone-else wrote:
I have a couple of them. If you have a timer too, you have to wire the photo cell in AFTER the timer (You don't have to but otherwise you have to use relays, and a box and it gets messy) Then when the timer says come on, it powers the photo cell, and if the photo cell says its dark the lights come on.
If the photo cell says its too light the lights will not come on until its dark enough.

By using a timer and a photocell the lights will come on at a specific time, but they will also switch off at a specific time (say 00:00)

The down side is that if it is light and the timer says come on, the lights will come on for around 1 minute while the photocell warms up (It really does warm up because it uses a small heater and bi metallic strip)


You should use a voltage free switched timer and feed the output of the photocell through the timers voltage free switches.

Or there is this

https://www.sangamo.co.uk/products/q551 ... 1085910022


And photo cell heads are available that will turn off at midnight with no programmer.


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PostPosted: Fri Aug 25, 2017 10:42 pm 
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£175 :shock: It may be the RollsRoyce of timers, but I bet the OP wont want one of them.

onlyme wrote:
You should use a voltage free switched timer and feed the output of the photocell through the timers voltage free switches.


I can't think why, but I could not do that.

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Take it easy, a forum is only a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link. to find out more.

No such thing as "Thou shalt put this wire here, Thou shalt put that wire there" .............Take a picture BEFORE you do the job.

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here


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PostPosted: Sun Sep 03, 2017 7:46 pm 
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Thanks everyone for your replies - very helpful and seems I've got a couple of options...

I've found a Finder module for under £50 with an "astro switch" function (basically works out sunset based off co-ordinates and time) which although more expensive than the photocell option should be easier for me to fit.

Cheers!


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