Eddy Current
Senior Member
Its a display case for make up and there are 4 foot sections for each 120/12 volt transformer. The people at the store are wanting to put more than one four foot section on the transformer.
How many LED lights can you put on a circuit?
- Thread starter Eddy Current
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PetrosA
Senior Member
- Location
- Lancaster, Pennsylvania
Until you let us know how many VA the transformer is rated for and how many VA per foot the LEDs use, you're the only one who can answer the question.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Usually these are rated watts per foot-- need to know that.
Eddy Current
Senior Member
Ok I will have to look at the transformer and let you know.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
- Location
- Massachusetts
LEDs are no different than any other load.
You need to know the capacity of the source and the current draw of the load.
I work with LED drivers rated at 100 watts peak 80 watts continuous.
The LED modules I connect to them range from 5 watts to 30 watts.
PetrosA
Senior Member
- Location
- Lancaster, Pennsylvania
Until they're not - usually when you're looking it up with a customer and you realize the manufacturer has one rating on the module, another in the catalog and you're standing there without a calculator...
Eddy Current
Senior Member
I noticed today on the cord to the transformer there is a tag that says 120 volt/ 7amps, I didn't realize LED's pulled that much. To answer your question about the wattage the only thing I saw was inside the instructions, it mentions it as the "60 watt transformer". If its 7 amps per every 4 foot, there is only one circuit there with a receptacle and a power strip plugged in and the store is wanting me to put all 24 foot on that one circuit. Looks like Im going to have to break it to them that they need more circuits.
mgookin
Senior Member
- Location
- Fort Myers, FL
You're still missing some information.
Can you give us a manufacturer name & model number so we can look it up?
Can you give us a manufacturer name & model number so we can look it up?
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
The 7 amp figure may be the limit on the cord itself or on the cord and the pass through capability of the strip.
I doubt very much that it is the input current of that four foot strip.
I would be very surprised if the strip was even a full 60w.
More likely less than 20, which would allow at least 3 to be connected to one transformer.
Tapatalk!
I doubt very much that it is the input current of that four foot strip.
I would be very surprised if the strip was even a full 60w.
More likely less than 20, which would allow at least 3 to be connected to one transformer.
Tapatalk!
Eddy Current
Senior Member
Just to be clear these are four foot column sections and the shelving lights up whenever you insert the shelves. Something similar to this picture.
mirawho
Senior Member
- Location
- Sun Valley, CA
I think finding out the manufacturer/model of the LED strip will solve your problems. There has to be some kind of info on the device. GoldDigger is right about the wattage. Usually, a strip in a 4' section is going to be around 15w. How do they tie in to the driver? Is this like a fluorescent lamp or is it a plastic strip?
Eddy Current
Senior Member
If I remember correctly it was little LED strips.
RichB
Senior Member
- Location
- Tacoma, Wa
- Occupation
- Electrician/Electrical Inspector
Until they're not - usually when you're looking it up with a customer and you realize the manufacturer has one rating on the module, another in the catalog and you're standing there without a calculator...
need to get one or the other of these
--I prefer the 270 but the 28 fits in a shirt pocket better!!- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Where do the batteries go?
RichB
Senior Member
- Location
- Tacoma, Wa
- Occupation
- Electrician/Electrical Inspector
:roll:right between the ears
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
If you have a 60 watt transformer than obviously the load is under 60 watts. It would not be 7 amps/4 ft-- I am quite sure of that-- maybe 7 watts/foot but that's all. I have not seen many that were more than 7 watts/foot but there may be some.
Do you have info such as make and model?
JDB3
Senior Member
- Location
- San Antonio, Texas
If in doubt perhaps hook up one and see what the amp draw is
hbendillo
Senior Member
- Location
- South carolina
I am assuming the transformer is rated 60 watts, and the transformer feeds a 4 foot section or unit. That being the case you could power a lot of 60 watt transformers with one 120-volt circuit. Twenty 60 watt transformers only comes to 1200 watts which is still well below the capacity of a 20 amp, 120-volt circuit.
As far as feeding multiple LED strips with one transformer, that is probably where you would have a problem. If we only knew what the total wattage for the 4 foot LED strips is we could help you. 60 watts of LED lighting on one 4 foot strip is a lot but maybe a lot of light is needed for the makeup area.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Because the LED strip will be a non linear load, a transformer rated for 60 watts into a resistive load may not be able to power 60 DC watts worth of LEDs either.
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