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Thread: Power Supply Question - Arduino Mega, 5v 40amps, WS2811 strip

  1. #1
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    Default Power Supply Question - Arduino Mega, 5v 40amps, WS2811 strip

    Hi all,
    I am new to all of this and to this forum and know very little. This is my first attempt at a project. I have done some background research but my math skills suck.
    I have a 350 strip of WS2811's being powered by 5v 40amp supply (which is injected in a couple of places to keep sufficient voltage to the pixels).
    Will this single power source be enough to handle what I have or should I get another supply to inject power down the line?

    Thanks for helping out this 60 year old trying to compete with the youngsters on my street!

  2. #2
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    Default Re: Power Supply Question - Arduino Mega, 5v 40amps, WS2811 strip

    Hi, each WS2811 when set to full brightness white will use slightly less than 0.06A. 350 Pixels * 0.06A = 21A. Your supply will be fine.

    To do the maths the other way round.
    If the power supply is run at 80% load, 40A * 0.80 = 32A. 32A / 0.06A per Pixel = 533 Pixels.

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  4. #3
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    Default Re: Power Supply Question - Arduino Mega, 5v 40amps, WS2811 strip

    Your 350 strip doesn't say very much if that's 350 feet, 350 meters, 350 inches, Ect...

    But I will make the assumption that it is 350 leds total, which at white color would use 60ma (0.06 amps) at most. So your 350 leds X 60ma (0.06amps) would equal to 21,000ma (21amps).

    Which would leave you with an extra 19 amps from your 40 amp supppy

  5. #4
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    Default Re: Power Supply Question - Arduino Mega, 5v 40amps, WS2811 strip

    as mentioned, you have the power. However, that does not mean you do not have to inject power at multiple points. If you have 5v pixels, then you need to inject power every 50 pixels. You will need multiple 16AWG wires running from your PSU to the pixels. Each should not be driving more than about 8A and each wire should be individually fused with a 10A fuse.


    2018 - Moving and going to visit my Daughter in New Zealand. Most likely I will be dark or nearly dark, Some static stuff that is simple to put up.

  6. #5
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    Default Re: Power Supply Question - Arduino Mega, 5v 40amps, WS2811 strip

    Yeah, it's 350 pixels. Thanks for all the help. I did see that after 200 pixels the voltage dropped down to about 3.7 volts, so I kind of planned to go ahead to inject power after every 50 pixels. I just picked up an Arduino Nano so I can play with some pixels on the Christmas tree. This has been fun but I need to do a lot more studying.

    Thanks again!!!

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