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Old 10-15-2010, 09:41 PM   #1
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Low voltage transformers


Does a 120v to 12v 600w low voltage transformer use the same amount of KWPH regardless if there is lights hooked up to it or not?

I ask because I am looking at the option of buying 12v rope lighting vs. 120v.

I have a 600 watt transformer from Home Depot that I'd like to use and keep everything on the 12v system.

I just dont want to power up a 600 watt transformer to only use less than 100 watts.

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Old 10-15-2010, 09:52 PM   #2
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Low voltage transformers


no. there is a very low level of consumption of power with no load on the secondary of the transformer.
Other than those losses, the power input is directly proportional to the power output.

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Old 10-15-2010, 09:58 PM   #3
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Low voltage transformers


So that hummmming noise is not 600 watts of power getting sucked out of my electric bill? Only draws measurable power if I have lights hooked up to the line right?
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Old 10-15-2010, 10:10 PM   #4
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Low voltage transformers


Quote:
Originally Posted by robbie59 View Post
So that hummmming noise is not 600 watts of power getting sucked out of my electric bill? Only draws measurable power if I have lights hooked up to the line right?
the power is measurable but it is only a fraction (small fraction) of the power that can be transferred through the transformer.

You can always put a switch on the line (house voltage) side of the transformer so there are no losses when not being used at all.
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Old 10-15-2010, 10:13 PM   #5
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Low voltage transformers


Thanks, I have a switch but I was curious to know if I was using too big of a transformer to power a small amount of lights. If the draw is the same as the consumption of watts per light, Im ok with that

Thanks
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