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Thread: Reliable 200w+ 12v supply for LEDs?

  1. #1

    Default Reliable 200w+ 12v supply for LEDs?

    I'm back to being a little stuck again. Many of these supplies on ebay and amazon are just unbranded or some random name that you search, then find nothing.


    I think I have luckily got away with getting cheap LED strips. The CRI is pretty poor, but they have worked out excellent value. They use what was stated as 2835 LED chips and have 2 wide and 120 of them per metre. They claim to use 24 watts per metre and I use 3 lots of 2.5 metre strips. The output of the power supply gets split then goes to each strip. It supposedly will use around 180w if there is no voltage drop. The light output suggests this is probably about right.



    https://www.amazon.co.uk/gp/product/...e?ie=UTF8&th=1

    I started off with a power supply like this 12v 15a one but switched the lights off by a switch on the 12v output cable. This meant the supply was switched on permanently even when the lights were off (which was most of the time) This probably wasn't ideal. It then started making clicking noises and soon gave up after a year or so. I did rewire it and put the switch on the 230v input cable when I bought the replacement though. So it will now be totally off when the lights are off.

    I then got the 30A version in the same link. This one has a fan which I didn't think would bother me, but it is tiny and doesn't seem to have a speed control depending on the temperature. The RPM rate must be insanely high and fixed. This was tolerable, but just a bit annoying. However, it has developed that at times when the fan isn't running, the supply emits a loud and high pitched noise (between 13 and 14khz). Many won't hear this but it is just unbearable for me. Guess it is my fault for going cheap, but I certainly can't trust these ones from amazon or ebay now despite seeming to have enough power in them.


    Someone suggested mean well as being a good brand but I seemed to have difficulty in finding suitable supplies by them that are sold in the UK. I have however now found one:

    https://www.powersuppliesonline.co.u...er-supply.html

    It looks incredibly similar to the dodgy ones I'd bought but is about 3 times the price. It does at least have a 3 years warranty and a well known brand name to it. And hopefully that will mean the parts inside will be reliable. I could do with a supply that has screw connectors like this one as the cables used have ring terminal connectors on them that I crimped into place.

    If this supply is a good one, then let me know or suggest some others that similar and at around the same price point.


    Thanks.

  2. #2
    Flashaholic* DIWdiver's Avatar
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    Default Re: Reliable 200w+ 12v supply for LEDs?

    I would expect that Mean Well to be a significantly higher quality product than the Amazon one. I would not, however, expect the fan to be quieter. Oh wait, it doesn't have a fan!!

    If pushing a PS near its limits for more than pretty short periods, I would provide it some additional cooling help by adding a small 12v fan to blow a little air on it. Even if you run it for half an hour a day, this could significantly improve its lifetime. On the other hand, if you operate it that little, its lifetime may exceed your needs!

    If you don't want to add a little fan, at least make sure it has plenty of free air flow and isn't in a terribly warm space. You might consult the data sheet, but I suspect that mounting it on a vertical surface would improve air flow by convection vs mounting on a horizontal surface.

  3. #3

    Default Re: Reliable 200w+ 12v supply for LEDs?

    How about a Computer power supply? They can run for decades reliably although you have to probably do a little modding to make it work nothing too technical though.
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  4. #4

    Default Re: Reliable 200w+ 12v supply for LEDs?

    Quote Originally Posted by DIWdiver View Post
    I would expect that Mean Well to be a significantly higher quality product than the Amazon one. I would not, however, expect the fan to be quieter. Oh wait, it doesn't have a fan!!

    If pushing a PS near its limits for more than pretty short periods, I would provide it some additional cooling help by adding a small 12v fan to blow a little air on it. Even if you run it for half an hour a day, this could significantly improve its lifetime. On the other hand, if you operate it that little, its lifetime may exceed your needs!

    If you don't want to add a little fan, at least make sure it has plenty of free air flow and isn't in a terribly warm space. You might consult the data sheet, but I suspect that mounting it on a vertical surface would improve air flow by convection vs mounting on a horizontal surface.
    I've since found the page that sold the LED strips that I have: https://www.ebay.co.uk/itm/12V-24V-2...EAAOSwtnpXlibf

    I'm sure many on this forum would be against anything at this price, but you sometimes can get a real bargain. These are about the only cheap strips that don't appear to fade towards the end of the strip (presumably due to voltage drop) They are a bit on the

    If my 3 strips of 2.5m use what the seller claims, then I will be using around 20 watts short of what this mean well power supply can handle.


    It would be rather difficult for me to mount this flat but I may be able to find a way. My plan is to have it the same way I've had the others which is fixing it under a wooden beam in the garage. This doesn't look to have holes at each end so I may be able to use a screw at one end and a cable tie at the other. This then would be horizontal but I'm not quite sure if this is the way you meant when you mentioned this. With all the cables only just long enough and already having crimped wire ring terminals, it will be a bit tricky mounting it a different way. But regarding fans, I do have a lot of small PC fans that I can easily think of a way of fixing to the side and presume that as they are 12v they can simply run from the supply itself. CPU fans are really quiet so likely won't bother me and if they have any issues, at least I can sort that out without messing up the warranty!

    The reason why I somehow thing fans would be quieter on proper branded products is because surely they would either be on permanently or have a variable speed. The one I got from amazon always came on at the same RPM. It must have been a tiny fan with an insanely high RPM as it sounded like quiet hair-dryer! Surely decent brands would have it regulated to spin faster when it gets hotter and not allow it to get hot enough for it to need such a noisy fan.

  5. #5

    Default Re: Reliable 200w+ 12v supply for LEDs?

    Quote Originally Posted by Lynx_Arc View Post
    How about a Computer power supply? They can run for decades reliably although you have to probably do a little modding to make it work nothing too technical though.

    Yea I certainly did think about this. PC supplies are really reliable and their fans are very quiet. But they area too bulky for the planned location and as you say will need a bit of modding. I had one sometime ago before deciding to go for this amazon supply and I wasn't sure if an individual one of the multiple molex wires would cope with the load I intended to use.

  6. #6
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    Default Re: Reliable 200w+ 12v supply for LEDs?

    Quote Originally Posted by Lynx_Arc View Post
    How about a Computer power supply? They can run for decades reliably although you have to probably do a little modding to make it work nothing too technical though.
    Perhaps I have simply had bad luck, but PC PSU are the components I have had fail more often than any other.

    Doesn't seem to matter if I've spent more for "bronze, silver, gold, whatever" higher rated versions, either.

    Obviously, it is a component which is heavily stressed ... either switched on and off frequently, or run constantly, and sees a lot of heat.

    Next most common part to fail, seems to be graphics cards. Lots of heat there too.
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  7. #7

    Default Re: Reliable 200w+ 12v supply for LEDs?

    Quote Originally Posted by archimedes View Post
    Perhaps I have simply had bad luck, but PC PSU are the components I have had fail more often than any other.

    Doesn't seem to matter if I've spent more for "bronze, silver, gold, whatever" higher rated versions, either.

    Obviously, it is a component which is heavily stressed ... either switched on and off frequently, or run constantly, and sees a lot of heat.

    Next most common part to fail, seems to be graphics cards. Lots of heat there too.

    Ah now that would be a problem. My switch would be on input cable (230v in the UK) input. So it would mean frequently turning the supply on an off drawing 180w instantly each time. I don't suppose that would be good for it. One reason why I think I would be better off going for the meanwell one I mentioned earlier.

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