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DC Power Supply Variable 30V 10A, KAIWEETS 4-Digit Large Display Adjustable Switching Regulated Power Supply with USB Interface

4.3 4.3 out of 5 stars 1,054 ratings
$61.91 $24.76 per kg
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Only 1 left in stock - order soon.
Brand KAIWEETS
Material PVC+Iron
Item Weight 2.5 Kilograms
Connector Type usb
Input Voltage 1.1E+2 Volts

About this item

  • High Measurement Accuracy: This 30V 10A dc power supply has a high resolution of 0.01V and 0.01A. The 4 LED digital display provides a more accurate readout for the voltage and current value, even be visible easily in the low-light conditions.
  • Constant Voltage & Constant Current Operation Mode: The easy-to-use rotary knob of coarse and fine could adjust the data of voltage and current digit by digit, which allows you to set the desired output resolution quickly and easily in 30V 10A.
  • 5V/2A USB Interface & The design with Elastic Handle: This adjustable power supply could charge the device which you want to repair. It also features a large display that makes it easy and accurate to read voltages and currents. In addition, the design with Portable and lightweight could help you to carry it easily.
  • Multiple Protections: This bench power supply provides overvoltage, overcurrent, overtemperature, overload, and short circuit to protect your device, prolong the service life of the dc power supply. In addition, it also has multiple heat radiation grooves on both sides, provides the cooling & exhaust fan protection.
  • SAFETY CERTIFICATE & SERVICE: This power supply conforms to RoHs and CE-Marking. Combined with Amazon's excellent delivery service, we provide 36-Month after sale service, lifetime technical support. Please feel free to contact us if you have any concerns.
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Customer reviews

4.3 out of 5 stars
1,054 global ratings

Customers say

Customers like the functionality, build quality, and appearance of the power supply. They mention it works well, has no issues, and is accurate. Some are satisfied with the value for money. However, some customers have reported that the power supply fails in a few months of use. Opinions are mixed on the noise level and voltage adjustment.

AI-generated from the text of customer reviews

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FunctionalityPower supplyBuild qualityLookValue for moneyNoise levelVoltage adjustmentPower supply quality
31 customers mention "Functionality"28 positive3 negative

Customers are satisfied with the functionality of the power supply. They mention it works well, has no issues, and the coarse/fine knob combo works well to dial in settings.

"The short version is that this PSU does a good job and I recommend it. Now for the long version...." Read more

"30V 10A units is nice and works will. Well built. If you don't need to make frequent adjustments to voltage and amps settings then great unit...." Read more

"At first, this power supply worked fine. I was using it to top-balance some lithium power cells...." Read more

"...I ordered new Ni-cds and reassembled. Voila totally functional. For raspberry pie projects this or other needs for DC power this would be great...." Read more

19 customers mention "Power supply"19 positive0 negative

Customers are satisfied with the power supply. They mention it's accurate, provides a steady supply of power, and is a valuable piece of kit to add to their collection. The display showing voltage and amps is accurate, and in line with their high-end multimeter. Overall, customers say it's a good option for a DC power supply.

"...To me, this seems like a pretty good option for a dc power supply." Read more

"Tested it with a multimeter and the voltage output is accurate. I put this to work immediately testing and prepping my current custom PC build...." Read more

"...Other than that, I am pleased with the power supply." Read more

"...I agree with those reviewers, it's quite accurate...." Read more

13 customers mention "Build quality"13 positive0 negative

Customers are satisfied with the build quality of the power supply. They mention it's well-made, reliable, and accurate.

"30V 10A units is nice and works will. Well built. If you don't need to make frequent adjustments to voltage and amps settings then great unit...." Read more

"...The unit seems well made and has some weight to it if that is an indication of quality materials I accept that...." Read more

"...The replacement is fine so far. Build quality seems alright, decent knobs and plugs etc. comes with a couple sets of cables which is nice...." Read more

"Excellent unit, good price, well made...." Read more

11 customers mention "Look"11 positive0 negative

Customers like the look of the power supply. They mention it's modern and makes their work bench look extra cool.

"...Inside mine had all good looking solder joints and nothing that I needed to redo. Wiring and grounding were all correct...." Read more

"30V 10A units is nice and works will. Well built. If you don't need to make frequent adjustments to voltage and amps settings then great unit...." Read more

"Excellent unit, good price, well made...." Read more

"...to have the grunt advertised and the fan only runs when needed so its nice and quiet." Read more

11 customers mention "Value for money"11 positive0 negative

Customers appreciate the value for money of the power supply. They mention it's a good unit for the price and a reasonably good buy. Some say it's a cost-efficient variable power supply and a valuable piece of kit to add to their collection.

"...has only been 13.79 to 13.81 max even when the mike is keyed. Good unit for the price." Read more

"Excellent unit, good price, well made...." Read more

"...only which are of average quality but for the price make it a reasonably good buy." Read more

"...They're very close in price so I went with more bang for the buck. I'm not paid by either its just what I ended up doing." Read more

11 customers mention "Noise level"5 positive6 negative

Customers have mixed opinions about the noise level of the power supply. Some mention it supplies stable power with very low noise and no audible click like old linear power supplies. Others say that the DMMs don't show how noisy the supply is.

"...the grunt advertised and the fan only runs when needed so its nice and quiet." Read more

"...It's a switching power supply so there is always some usual switching frequency noise, but it's not bad and is in line with all the other switch..." Read more

"It’s lightweight, quiet and it has accurate power output...." Read more

"...My only criticism would be the noise of the cooling fan. It sounds exactly like a quieter version of my heat gun. It's noticeable...." Read more

9 customers mention "Voltage adjustment"6 positive3 negative

Customers have mixed opinions about the voltage adjustment of the power supply. Some mention it's easy to adjust, while others say the setting is very coarse and the amps are automatic.

"Changeable between adjustable voltage mode, and constant current modes...." Read more

"...The reason for the 4 instead of 5 is voltage setting is *very* coarse on the coarse knob, and *very* fine on the fine knob...." Read more

"...The voltage tunning switches are sensitive and easy to use. So if you want a lightweight switching power supply. This is a good one." Read more

"...So far I have used it o power my hot wire foam cutter and the unit is easy to adjust for that just right heat setting...." Read more

14 customers mention "Power supply quality"0 positive14 negative

Customers are dissatisfied with the quality of the power supply. They mention it fails in a few months of use, is cheap, and of low quality. Some customers also say the fan stopped working.

"...I thought it would be a cheap low quality power supply. But after some use and testing. The ripple is actually pretty low...." Read more

"My 1st unit was defective. I emailed customer service who jumped on it right away even though it was the weekend...." Read more

"I returned, the output was noisy and the power supply was cheap...." Read more

"...All-in-all it just feels like a really low-end power supply. I am sure for $80 (what I paid) I can get something substantially better." Read more

good power supply. Not pleased with connectors
4 out of 5 stars
good power supply. Not pleased with connectors
I dislike the binding terminals. see image 2 on how I insert the wires? No holes inside to secure to prevent short. I replaced the connectors (found in amazon) in pix 4 (top is original, bottom is new one I replaced with), which has hole inside. final pix shows how I route wire safely and easier. Other than that, I am pleased with the power supply.
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Top reviews from the United States

Mark L AZ
5.0 out of 5 stars Much better than expected, recommended
Reviewed in the United States on June 11, 2020
Verified Purchase
The short version is that this PSU does a good job and I recommend it. Now for the long version.

I tested the power supply with an oscilloscope and had good results. It's a switching power supply so there is always some usual switching frequency noise, but it's not bad and is in line with all the other switch mode PSUs on my workbench. Including some rather good quality ones. I think somebody else posted photos with their test gear connected so I'll spare everybody a repeat.

Cooling fan is temperature controlled and was quiet during all my testing.

Inside mine had all good looking solder joints and nothing that I needed to redo. Wiring and grounding were all correct. If you've ever opened a cheap Chinese device you know that sometimes they cut corners on assembly but this was spot on.

Mine was able to deliver 30+ volts at 7+ amps during my tests, no issues. I don't have a big enough test load to test up to the full 10A but I don't have any doubts that it can deliver.

Selecting the voltage or amperage you desire can be a bit difficult. The coarse knobs are REALLY coarse and the fine knobs don't go very far. Once set though they do stay and the voltage did not drop under load.

Current limiting is not very responsive and I've seen it overshoot before clamping down. If you're going to rely on this to catch transient current spikes you may be disappointed. For constant current applications (LEDs) it seems fine though. No audible CLICK like old linear power supplies.
18 people found this helpful
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Jacqui
5.0 out of 5 stars Constant Current/Voltage modes, beefy, works great!
Reviewed in the United States on August 23, 2020
Verified Purchase
The media could not be loaded.
Changeable between adjustable voltage mode, and constant current modes. This allows you to, for example, charge a lipo battery on constant current up until 4.0 volts, and then on constant voltage mode until 4.2 volts.
This is my first experience using a dc power supply and I’m excited to keep using it and learning more about it and how it works.
This will come in very handy for school electronics projects where I currently have no access to the maker labs due to Covid.
It’s worked great for me thus far, no complaints! To me, this seems like a pretty good option for a dc power supply.
10 people found this helpful
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Bucky
4.0 out of 5 stars No separate DC power output button. Must short leads to set amperage.
Reviewed in the United States on May 15, 2021
Verified Purchase
30V 10A units is nice and works will. Well built. If you don't need to make frequent adjustments to voltage and amps settings then great unit. That apply to lot of the power supplies on the market designed like this unit. Great looking and easy to read display. Super light. Short comings and for me kinda safety issue is that there is no way to turn on and off DC output without turning off the whole unit. To set starting amperage point you have to short circuit connection to see set value. If you want to set fine adjustment for volt and amp then need to set fine knobs in the middle so you can adjust up and down. For safety start with all knobs all the way down to the left. You can live adjust volt and amps. If powering output device like led lights you can see active volt/amps (how may volt and amp using) but cannot set the preset values. If you want to change preset values then must disconnect everything to see voltage preset and short circuit to change amps preset. I bought this unit first then for 11 more dollars I got the Rockseed HM3010P. Way better unit for the money that is programmable. Can see all values with push button on the front panel (live volts, live amps, preset volts, preset amp, OVP and OCP. See my review on it.
2 people found this helpful
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4nonCa00D
5.0 out of 5 stars Low ripple. Light weight switching PS.
Reviewed in the United States on July 24, 2020
Verified Purchase
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First impression after I got it was the PS is so light. I thought it would be a cheap low quality power supply. But after some use and testing. The ripple is actually pretty low. I see no difference between a linear power supply and this one. The voltage tunning switches are sensitive and easy to use. So if you want a lightweight switching power supply. This is a good one.
14 people found this helpful
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Richwizard
5.0 out of 5 stars Excellent bench power supply
Reviewed in the United States on September 16, 2020
Verified Purchase
Tested it with a multimeter and the voltage output is accurate. I put this to work immediately testing and prepping my current custom PC build. Used it to test the case fans and run the water cooling pump before the other components were installed. Using PrimoChill's new system prep kit for the water cooling loop took days of constant running. The voltage didn't vary any more than 3/100 of a volt; sometimes going up or down slightly. Even the USB plug on the front got put to use charging my phone. This power supply is one of the best tools I've gotten recently for my new workbench. My only criticism would be the noise of the cooling fan. It sounds exactly like a quieter version of my heat gun. It's noticeable. It's a standard 80mm, 12v fan so it's fixable for me.
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CYPC
5.0 out of 5 stars I use this power supply to run a foam hit wire cutter and it works great.
Reviewed in the United States on April 19, 2021
Verified Purchase
I like the easy to read digital displays and that it comes with an assortment of connectors. The unit seems well made and has some weight to it if that is an indication of quality materials I accept that. So far I have used it o power my hot wire foam cutter and the unit is easy to adjust for that just right heat setting. Once set I can turn it off and on several times and the voltage and amp settings are repeatable.
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Tessera
1.0 out of 5 stars Unit failed within 24 hours
Reviewed in the United States on January 11, 2021
Verified Purchase
At first, this power supply worked fine. I was using it to top-balance some lithium power cells. The problem started when I switched it from constant voltage to constant current mode. It switched over to constant current mode just fine... but now, it refuses to switch back to constant voltage mode. I've tried everything. I followed the instructions in the user manual to the letter. Yes, I tried disconnecting the load first. I tried everything under the sun... and yet, when you reconnect the load, the unit goes right back to constant current mode, which means it won't let me adjust its output voltage at all. I will be returning this useless piece of garbage to Amazon today, for a full refund.
3 people found this helpful
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Richard Woodward
5.0 out of 5 stars Quality unit!
Reviewed in the United States on January 9, 2021
Verified Purchase
I have this unit in service about a week. I purchased it as there was a fair amount of drift on the incoming a.c. Service. This is used for two way radio communications. I have it set for voltage control at 13.8 volts. While more stable than my incoming a.c. the drift on d.c. has only been 13.79 to 13.81 max even when the mike is keyed. Good unit for the price.
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Top reviews from other countries

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aiden
5.0 out of 5 stars good power supply
Reviewed in Canada on October 22, 2022
Verified Purchase
this power supply is amazing. i love it. test leads are kinda low quality but they work perfect for battery testing, diagnostics for smaller electronics, and capacitor testing. the terminal caps on the supply can unscrew in case the banana clips become faulty, and to put the test leads on. the power supply itself is smaller than i previously assumed, and also much lighter. but this power supply is still a beast.
NOTE: current can only be adjusted when a load is connected properly. which i use to detect if a connection is wrong and GND has triggered. the USB port on the supply is fast charge. 5 stars
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Axel CANICIO
5.0 out of 5 stars Très bien.
Reviewed in France on May 31, 2024
Verified Purchase
J'utilise cette alimentation de laboratoire depuis plusieurs années et il m'a jusqu'à présent donné entière satisfaction. La précision est bonne à 0,25% près. Si je demande 12V, j'ai 11,97V.
Le seul truc qui me dérange est la méthode pour regler l'ampérage maximal voulu.
Il faut mettre en court-circuit les deux bornes et ensuite regler les boutons de l'ampérage.
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Jerry Wahlstom
4.0 out of 5 stars Works OK
Reviewed in Sweden on January 8, 2023
Verified Purchase
A good unit but a little bit sensitive when adjusting voltage and current.
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Fransies
5.0 out of 5 stars Muy contento, buen producto.
Reviewed in Spain on November 3, 2022
Verified Purchase
Buena fuente de alimentación, buena calidad de material y acabado con bastantes accesorios, muy contento.
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Klaus The Old Drummer
5.0 out of 5 stars Für Hobby-Elektroniker ausreichend gut
Reviewed in Germany on January 7, 2022
Verified Purchase
Eigentlich ist alles wie es sein soll. Mangel sind die mitgelieferten Anschlusskabel. Ganz billig verarbeitet. Eine Krokodilklemme hat gleich versagt. Es sind auch viel zu verspielte Drähte. Für meine Zwecke reicht es. Habe jetzt hochwertige Klemmen angebracht aber es musste nicht sein. Hat mit AMAZON nix zu tun. Die Anzeige muss kalibriert werden um nicht ständig hin und her zu springen. Der USB-Anschluss ist klasse und hat auch ausreichend Ampere (2).
Habe gleich mein Iduktionsgerät damit getestet und im Gegensatz zu einfachen Netzteilen gibt es hier eine stabile Verbindung und auch die Last hält das Gerät kontinuierlich aus!!
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Klaus The Old Drummer
5.0 out of 5 stars Für Hobby-Elektroniker ausreichend gut
Reviewed in Germany on January 7, 2022
Eigentlich ist alles wie es sein soll. Mangel sind die mitgelieferten Anschlusskabel. Ganz billig verarbeitet. Eine Krokodilklemme hat gleich versagt. Es sind auch viel zu verspielte Drähte. Für meine Zwecke reicht es. Habe jetzt hochwertige Klemmen angebracht aber es musste nicht sein. Hat mit AMAZON nix zu tun. Die Anzeige muss kalibriert werden um nicht ständig hin und her zu springen. Der USB-Anschluss ist klasse und hat auch ausreichend Ampere (2).
Habe gleich mein Iduktionsgerät damit getestet und im Gegensatz zu einfachen Netzteilen gibt es hier eine stabile Verbindung und auch die Last hält das Gerät kontinuierlich aus!!
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