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Old 12-02-2010, 06:59 PM   #1
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Dawn to Dusk Outdoor Light Timer


Electrical Question about those Dusk-to-Dawn timers you can get for outdoor Christmas lights that turn on at night and turn off during the day, does anybody know if they only work if plugged into a 120V power supply? If it were rigged up to a 9 to 20 V power supply would it still function correctly?


Last edited by jerevdl; 12-02-2010 at 07:21 PM.
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Old 12-02-2010, 07:11 PM   #2
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Dawn to Dusk Outdoor Light Timer


They are dusk to dawn not dawn to dusk and no, a 120 volt device will not work "rigged" up to 9 to 20 volt supply.

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Old 12-02-2010, 07:18 PM   #3
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Dawn to Dusk Outdoor Light Timer


Sorry yes I meant, Dusk-to-Dawn. I'm not asking if a 120V device will work with only 9 to 20 V, I know that obviously won't work.
What I'm asking is if I had, say a 10 V load and fed the 10 V supply through the Dusk-to-Dawn timer to the load, if the on/off function (Turning off when there is light, and turning on when there is no light) of the timer will still work.
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Old 12-02-2010, 08:54 PM   #4
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Dawn to Dusk Outdoor Light Timer


Are you talking about a 10 volt load or a 10 amp load? A 120 volt photo cell could control a relay or contactor which could control a 10 volt device.
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Old 12-02-2010, 09:20 PM   #5
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Dawn to Dusk Outdoor Light Timer


Those timers switch the voltage coming into them (3 or 4 wires, Black for hot, White for neutral and red for the switched load. Maybe a green for ground)

so no, they will NOT directly switch a low voltage load. However, you could have the timer switch a Relay or contactor that will switch whatever voltage you want.

You might look in to a Tork TU40

http://waterheatertimer.org/pdf/TU40-wiring.pdf

It will do 28VDC. Anything lower I think you will need to get into a relay system mate.
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