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Are these power supplies good? Answered

The cheap bare metal power supplies from ebay or other sides have been reviewed many times on youtube and people have found that they are actually decent. But I cannot find any reviews of the sealed plastic kind of power supplies.

The "bare metal" ones I am talking about look like this, and the "sealed plastic" ones look like this and this.

Edit: None of your replies answer my question. I am not asking which one I should choose, I am asking if the plastic ones are just as decent as the metal ones.
There are a few reviews of the metal ones, and people have found that they are actually quite decent. Here are some:
https://www.youtube.com/watch?v=vwFrP7uK5lM
https://www.youtube.com/watch?v=71NWT5vrbk8
But I cannot find any reviews of the plastic ones, so I don't know if they are just as good. I am asking if anyone has gotten any of these and made a review with some tests, or knows of a review of these.

Discussions

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Wired_Mist

4 years ago

Above All Else, you need to look for what Certification it has.

Take it from someone who's trying to source a few hundred of these things :P

"UL" or "CSA" are the ones that are designed to the Safety specs for north america, CE is designed for Europe's Specs. I never risk the Chinese "CCC" anymore, I've had too many Devices Fail on me (Not to mention simple Safety issues like electrocution or Fire) There's a Good Reason any Reputable Company will only build/Import "UL" and "CSA" Listed Equipment.

To actually Answer Your Question though...

The metal one's are Designed for Permanent Installation, Plastic are more or less Temporary and are easy to move around. Purely depends on the Application; Either one works well.

For smaller projects I Stick with the plastic ones. The Smaller Oval style for low amp, brick style for higher amp Projects. I will only use the Mealy ones for Permanent Installation or for Crazy High Amperage Requirements.

**During my testing** I had a sample of the Exact Same Brick style power supply you pictured, Garbage. Like I actually heard bits rattling around inside. Opening it up it got even worse lol. Wires stripped too far back and cold solder joints mostly. There are good ones, just Not that specific one.

Hope that Small Essay Helped you out !

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poiihyWired_Mist

Answer 4 years ago

Also, usually cheap stuff like this lie about their certification.

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Wired_Mistpoiihy

Answer 4 years ago

Like I said the only difference is what application they are designed for; Both types work just fine !

If you can see that the UL or CSA Logo is printed there AND the seller has a high feedback rating (98%+) you shouldn't have to worry. If you have any doubt, they are required to show you the Cirtificate from the Inspection Agency at your request. If they don't, there are hundreds of others that can !

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poiihyWired_Mist

Answer 4 years ago

I am not asking which I should choose, I want to know if the quality of the plastic ones are decent like the bare metal ones are.

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FarmerKJS

4 years ago

It just depends on what you are doing.

Higer current Usally bare metal

Ease of use Sealed Plastic (wallwart)

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poiihyFarmerKJS

Answer 4 years ago

No, I want to know if the sealed plastic ones from ebay are as good as the bare metal ones. I'm not asking which one I should choose.

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FarmerKJSpoiihy

Answer 4 years ago

I usaly go with the plastic as they are cheaper and more readily availile.

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fmarquis

4 years ago

In my experience, as long as you stay away from their maximal current as stated by the seller, they are usually good. Each sellerwill try to boost the max current their power supply can supply but it is usually for only a short period (or they get quite hot).

As a general rule, always read all the details and be suspicious if you read stuff like "50% duty cycle". Donn't be shy, ask the seller the question directly. Also look for efficiency : this information should be available.

Finally, make sure the frequency, voltage rating and power cord is compatible with your country. I also found that switching power supply in plastic boxes run hotter when used with 240v.

Before plugging everything to a crucial piece of equipment, I always check the voltage with a dummy load and if you have access to an oscilloscope, you can check the ripple current. Should be 5-10% max. This info is also usually available from the seller. If it is too important, you can add a few caps to smooth it down, so no be worries here.

In the end, I bought a few ones from different sources and they always performed well, but I don't push them to their max current. If you want to do that, go for a go and recognized brand or a laptop power supply.

Hope that help