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Power supply - BigW lights

Discussion in 'Power Supplies' started by gerry, Jul 29, 2014.

  1. gerry

    gerry Senior Elf

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    Hello,

    On almost all of the posts that I have read on this topic, a 27V PSU (similar to first link below) was used and then wound up to 29V or greater. Mostly used in conjunction with rays 27ch controller.

    Is there a reason why a 31V PSU was not/should not be used instead (second link below) ? Ray said it could be adjusted from 29.5V to 32.5V

    http://www.aliexpress.com/store/product/AC-DC-Switching-Power-Supply-with-85-to-265V-Input-Voltage-27V-350W-output-CE-approved/701799_431656111.htmlhttp://www.aliexpress.com/store/product/31V-350W-Switch-mode-power-supply-AC90-260V-input/701799_846178043.htmlRegards
     
  2. AAH

    AAH I love blinky lights :) Community Project Designer

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    The only reason the lower voltage supply might be used in preference is because it is better to start low and wind up to the required voltage. If the power supply won't wind down far enough it becomes useless as too high a voltage can destroy your lights whereas too low a voltage will simply leave your lights being a bit duller than they should be.
     
  3. OP
    OP
    gerry

    gerry Senior Elf

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    Thanks Alan,

    Understood !

    I thought that I had seen posts from Eddy etc indicating that it had to be > 30V anyway to work, but also saw posts from others indicating a lower voltage was being used.
     
  4. David_AVD

    David_AVD Bite my shiny metal ass!

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    I use my Big W lights on 30V. I've seen others run theirs at 31 - 33V, but I reckon 30V is already brighter than they were with the original controller and transformer. I would expect that pushing them too hard (higher voltage) will reduce their life.
     
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    gerry

    gerry Senior Elf

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    Thanks David, Will go for the 27V one then. Met ruprect on the weekend and he showed me how easy it was , so will give it a stab . Was putting in an order to Ray anyway.
     
  6. scamper

    scamper Senior Elf

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    This is 3 strings hooked up through a 27 channel controller on a 27v power supply.
    they work fine and super bright, so I wouldn't bother with a higher voltage.
     

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  7. David_AVD

    David_AVD Bite my shiny metal ass!

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    One thing I forgot to mention is that some of the straight blue or white strings may not work as well on too much less than 30V. This is due to the different Vf ratings on the LEDs.
     
  8. OP
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    gerry

    gerry Senior Elf

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    Many thanks Scamper and David. Order placed. Nothing ventured , nothing gained :)
     
  9. scamper

    scamper Senior Elf

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    The other reason I went the 27v is that the 27ch controller is listed as 5-24v. so running a little higher at 27v is better than going all out at 30v. even though I believe it will take it, Why tempt fate ???
     
  10. franky_888

    franky_888 Apprentice Elf

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    Should have asked this question myself a week ago it seems. I've pulled the trigger on 2 x 30v supplies for my BigW strings.

    I guess I can report on the lifetime of my strings after a couple of years
     
  11. fasteddy

    fasteddy I have C.L.A.P Global Moderator Generous Elf

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    You should be able to dial the voltage down a little bit so you might be able to get closer to 27 volts, just turn the little dial down whilst taking the volt readings and you should be able to lower it by at least 1 volt.
     
  12. David_AVD

    David_AVD Bite my shiny metal ass!

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    Just to clarify, I've had no issues running them on 30V.
     
  13. franky_888

    franky_888 Apprentice Elf

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    Thanks eddy. That was my original intention
     
  14. Beacy

    Beacy It's so much better on the dark side

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    Mine run at 30-3V and there is far more damage done to the lights by the weather than the voltage . At best I get 4 years out of a set and it is not due to excessive voltage
     
  15. anon

    anon Apprentice Elf

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    A bit of a thread mine, but thought this would be valuable for those wanting to power Big W strings cheaply from existing DC power supplies.


    I'm using a "150W DC-DC Boost Converter 10-32V to 12-35V 6A Step Up Voltage Charger Power". Search for the term on ebay, they're about $7.


    [​IMG]



    I power it all from one of my 12VDC meanwells, and set to about 30V through the Ray Wu 27Ch controller. It's running 3x 20m W-White, 1x 20m Red, 2x 20m Multi, 1x 20m Blue, 2x 8m W-White icicles.
     

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