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MegaWatt vs. Chinese Imitation 30 amp switching power supply comparison

Discussion in 'Product Reviews' started by Moleculo, Mar 19, 2015.

  1. dave457

    dave457
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    Dude, they make fans that are literally silent! and I don't think a fan running all the time when the unit is just on or pulling amps will hurt anything other than needs a good dusting out every now and then


     
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  2. N0NB

    N0NB
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    Can you recommend a way that doesn't void the warranty, DUDE?
     
  3. Old_Crow

    Old_Crow
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    Been using them for a few years now and I added a large 4M cap as a filter and no problems. I got it from a auto stereo shop.
     
  4. Megawatt

    Megawatt
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    The fans run all the time to eliminate heat cycling. The constant heating and cooling of the internal parts of a power supply is what causes early failure. The problem is the power supply needs 25 CFM to keep it cool so the movement of air is what you are hearing. The fan manufacturer and my db meter both read 30 db at 3 feet with the fan blowing away from the meter. Feel free to open the case and change the fan if you can find one quieter but 30 db is the quietest double ball bearing fan I can find that moves 25 CFM. I know this thread is old but I didn't see it before.
     
    #109 Megawatt, Apr 20, 2017
    Last edited: Apr 20, 2017
    jwilkers and LeapFrog like this.
  5. jwilkers

    jwilkers
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    Fan doesn't bother me at all :) Tells me it's working........ working great for 5 years and counting now.
     
  6. Megawatt

    Megawatt
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    Yes, some people are super sensitive to noise. 30 db is equal to leave rustling sound-wise. I have a video of four S-700-12 power supplies running in parallel on my website. Its a great way to compare my voice to the sound of four units running together before you buy. One power supply is a lot quitter than four running together too. If anybody knows of a 60mm X 60mm X 25mm 12 volt 25 CFM fan than is quieter than 30 db please tell me about it.
     
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  7. wavrider

    wavrider
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    I am using two of the 50 amp in parallel
    PS are about 2 1/2 feet from my rig
    Never ever one complaint about back ground noise from the fans.
    I do not hear the fans at all
     
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  8. N0NB

    N0NB
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    For all of those that have no problem with the fan noise, mine is listed for sale in that section. It has been in the box all of the time since I noted my experience in this thread. It is essentially brand spankin' new.
     
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  9. 2RT307

    2RT307
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    I have a ham friend that just bought one, and he seems really happy with it.

    73,
    Brett
     
  10. Riverman71

    Riverman71
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    I have the 30 amp version and love it. Purchased it directly from the Mega Watt website (clicked on their ad on this site.) These are real bargains and service is great. Shipped the same day as ordered.
     

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