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Thread: 50W RGB LED driver board (WS2811 version)

  1. #21
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    Default Re: 50W RGB LED driver board (WS2811 version)

    How many amp's will this draw at all white?

  2. #22
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    Default 50W RGB LED driver board (WS2811 version)

    1.8A max
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  3. #23
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    Default Re: 50W RGB LED driver board (WS2811 version)

    Quote Originally Posted by RobG View Post
    1.8A max
    Thanks RobG

    Quote Originally Posted by Roterhead View Post
    I'm planning on a 36VDC supply (enough for 6 flood) and one of these to drop the voltage down. The power lines will need to support around 6A of current for 6 floods.

    About $40 bucks for the supply (plus case), and $2.25 for the Buck convertors in the Floods.

    So now my question is if 1.8A max I don't see how Roterhead could run 6 on 1 power supply but that could be me just not understanding it correctly

  4. #24
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    Default Re: 50W RGB LED driver board (WS2811 version)

    I think he may not realized that 50W version draws twice as much current as 10W and 20W versions do.
    “If somebody offers you an amazing opportunity but you are not sure you can do it, say yes – then learn how to do it later!” ― Richard Branson
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  5. #25
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    Default Re: 50W RGB LED driver board (WS2811 version)

    Quote Originally Posted by RobG View Post
    I think he may not realized that 50W version draws twice as much current as 10W and 20W versions do.
    Ahh ok then I do understand what I'm reading. Thanks

  6. #26
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    Default Re: 50W RGB LED driver board (WS2811 version)

    I have some 30 watt RGB modules but no heatsink.
    What suggestions do you have regarding heatsink requirements?
    I have some old Pentium PC processor heatsinks that I may use when I get around to it.

  7. #27
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    Default Re: 50W RGB LED driver board (WS2811 version)

    Quote Originally Posted by LightUp View Post
    I have some 30 watt RGB modules but no heatsink.
    What suggestions do you have regarding heatsink requirements?
    I have some old Pentium PC processor heatsinks that I may use when I get around to it.
    I went to the local metal salvage and picked up an arm load of various size heat sinks for 10$.
    While I was there ,I noticed a couple of fellows selling/dumping brand new cat * cable in heaps out of a van .
    I guess in these economic times people are liquidating everything at any means possible .

  8. #28
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    Default Re: 50W RGB LED driver board (WS2811 version)

    I re-ran my calcs in more detail and stopped using guestimates.

    My 36VDC supply is rated for 350W Maximum. If I de-rate the supply I would assume no more than 300W Max. The supply costs around $35.

    300W/50W = 6 floods assuming no loss in the buck convertors or wiring.

    There is an efficiency loss in the buck convertors, which is around 15%. Assuming that is true, then the power draw could be as high as 50W/.85 = 59W power draw on the 36V line at full white. This could put the max number of floods at 5 (300W/59W). The current draw would be a maximum of 300W/36V=8.33 Amp.

    That is why the 36Vdc feeds a buck convertor, to drop the voltage to around 27VDC. The 1.8A applies to this 27VDC, not the 36Vdc line.This way Vdrop on the supply lines can be as much as 20% (36VDC -> 29VDC) and still have room for the buck to properly convert.

    So the power supply operated this way will be the PS + enclosure + the bucks. Assuming the enclosure is $15, then the total cost for 5 floods will be $35 + $15 + (5 * $2.25) = $61.25 or $12.5 / flood.

    Quote Originally Posted by MrSmoofy View Post
    Thanks RobG




    So now my question is if 1.8A max I don't see how Roterhead could run 6 on 1 power supply but that could be me just not understanding it correctly
    Last edited by Roterhead; 07-29-2015 at 11:42 PM.

  9. #29
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    Default Re: 50W RGB LED driver board (WS2811 version)

    I'm about to place a large order for Mean Well power supplies with a US Distributor (http://doityourselfchristmas.com/for...350-12)/page4) I can get 24v and 36v supplies as well (by the case). This is not a group buy but if there is enough interest in 24v and/or 36v I'll add to my order these as well they would be $33 + shipping just let me know.

  10. #30
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    Default Re: 50W RGB LED driver board (WS2811 version)

    50W flood next to its little cousins, 20W and 10W

    unnamed-3.jpg
    “If somebody offers you an amazing opportunity but you are not sure you can do it, say yes – then learn how to do it later!” ― Richard Branson
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