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Thread: Wire Length Question

  1. #1
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    Default Wire Length Question

    I have some Boscoyo 99-pixel canes and 105-pixel trees (7 canes, 8 trees). I have a good idea where they will end up in my yard, and also where the PSUs will be. I'm using 5v pixels, with dedicated 14ga power wires going to the middle of each prop. Some of the props will be only a few feet away from a PSU, while others may be as far as 20'. I was considering making all power wires the same length - regardless of distance to PSU, thinking that then they would all have the same resistance, and thus would be the same relative brightness. But that's also going to be a LOT of extra wire, which is both more costly, and also will be that much MORE wire in the yard. Will there be a significant brightness difference between using 3' of wiring vs 20'? Am I over thinking this too much? Thoughts or experiences appreciated!

    Thanks,
    -pc

  2. #2
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    Default Re: Wire Length Question

    Coils of wire on the ground create an inductor which can cause a drop in voltage. Also wire resistance is ohms per foot. Every foot increases energy lost as heat.


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  3. #3
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    Default Re: Wire Length Question

    Quote Originally Posted by MartinMueller2003 View Post
    Coils of wire on the ground create an inductor which can cause a drop in voltage. Also wire resistance is ohms per foot. Every foot increases energy lost as heat.
    I don't do pixel so this is just a curiosity question. What is the typical way people handle this then, use 12v power supplies with buck converters or many smaller 5v power supplies?
    Chris
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  4. #4
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    Default Re: Wire Length Question

    You're overthinking the matter. I don't think that anyone would notice any difference in brightness, especially at anything less than 100%.
    Phil

  5. #5
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    Default Re: Wire Length Question

    It depends. I have some very dense props and those have 5v supplies right at the prop. My arches and Candy canes have 5v psus in a cluster. My 6' trees have one PSU per two trees. My house pixels use 24v PSUs with lots of 5v bucks. A typical window has 8 bucks. My hanging (inverted) arches and roof outline have a buck every 25 pixels. My snowflakes have a buck on every arm, etc.


    2022 - Not sure yet. At least two new songs.
    2021 New Tune-to sign. New 40x27 matrix at the house. Retiring the Strip based matrix. Updating some of the old window frames to the new house. Adding two new songs.
    2020 Full sized show reworked for the new location. Only adding (famous last words) 13 RBLs that I finally got converted to using pixels
    2019 - Just moved into a new home (yet another change of plans). Will be dim but not dark. Too much to do at the new place to leave time for a show. Dim show (3000 pixels) had regular visits most nights.
    https://www.youtube.com/user/MartinMueller2003

  6. #6
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    Default Re: Wire Length Question

    Thanks. That makes sense.
    Chris
    [URL="http://www.maloneylights.com"]http://www.maloneylights.com[/URL]
    [URL="http://halloween.maloneylights.com"]http://halloween.maloneylights.com[/URL]
    [URL="http://ctm.maloneylights.com"]http://ctm.maloneylights.com[/URL]

  7. #7
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    Default Re: Wire Length Question

    Thanks all for the feedback! I went with varying lengths of wire based on proximity to PSU.

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