NICE-POWER DC Power Supply Variable 30V 10A, Adjustable Switching Regulated DC Bench Power Supply with Output Switch High Precision 4-Digit LED Display, Benchtop Lab Power Supplies with 5V/2A USB Port

I bought this to help balance and charge my 2016 Prius C-type battery modules (not for the faint of heart-- make sure you do your homework before attempting this), and I have to say this power supply exceeded my expectations. It has a constant current mode and a constant voltage mode, but the interesting and convenient feature is that it switches automatically between these two modes according to the load you attach. If you set the max current to 2 amps, and the max voltage to 8.0 volts, it will deliver 2 amps while the battery voltage is at 7.7, 7.8, 7.9 and then when it reaches 8.0 volts it automatically switches to constant voltage mode and the current drops. It doesn't go to zero at first, because the battery was at 8.0v in part because of internal resistance, so the thing gently lowers the current and prevents the voltage from exceeding 8 volts. This was extremely convenient, as it allowed me to leave it unattended for periods of time without worry I would damage the modules by over charging. There are purpose-built battery chargers that will also do such things, with some added benefits of measuring the battery capacity in the process, but honestly I wasn't really interested in doing a deep exploration of every module, and I wanted to balance them all at once. Even quite expensive battery chargers can't produce the high current you need for large parallel banks of EV modules, so this ended up beating out the hobbyist battery charges so badly I returned those and I'm keeping this.The way I used it was to switch the whole battery from series to parallel by reversing the orientation of every other module (again-- you have to know what you are doing to try this, I have a degree in EE), and then I ran a 14 AWG wire connecting all the negatives together, and another connecting all the positives together. I just hooked up the power supply to the bank all at once. I set it to a max voltage of 8.0v and a max current of 4 amps (which divided by 20 battery modules is way below the 0.1C current standard), and then I could walk away and let the device do its thing. If you go to the trouble to check the output voltage delivered with the value that the unit displays on the screen, be sure to measure the voltage at the terminals-- as the voltage drop at 4A in the leads is significant. I found the readout to be decently accurate (though its only 2 decimal places past the decimal point, so not an ultra-high precision voltmeter by any means). I really like it. When its working hard, the fan turns on to prevent overheating, so it has a little personality to it to boot.It is a sign of the times that I was able to buy a $35 module, and a $30 power supply and then repair a hybrid battery that the repair shop wanted $3600 to fix. Today I have a perfectly working Prius C-type, a really sweet power supply, and $3535 dollars in my pocket. SMH.

Not everyone would open the cabinet on this bench supply. I have similar ones from other manufacturers and there's no comparison. This one is a work of art inside. Also, my others don't have an OUTPUT button to allow dialing in of volts/amp without load. Terrific feature. This one is more slender and slightly smaller with a VASTLY improved digital readout instead of plain Red LED. Also, a wattage output readout as an extra. Just love it. I use it a ton and it's the best of this kind by far and at a great price! Enjoy.

This 15v 10a variable desktop power supply is an extreme bargain for what you pay. It's simple and basic, but it works fairly accurately, and it is cheap, cheap, cheap. Maybe I should say inexpensive, as cheap has negative connotations:)More usb ports and a couple of usbc ports that are metered would be awesome, but that might drive up the price, and I was looking for a very inexpensive desktop variable supply.It's only been a few days and a handful of hours of use, but I am very happy with it so far.

didn’t know what to expect for a dc power supply. I found this unit to be what i needed with pretty good analog voltage adjustment controls for fine voltage setting for sensitive to voltage circuits. add that to the 100 vdc capabilities and you have a nice lab power source. with the ability to enable/disable the output voltage by front button you can set your voltage and current limit setting before engaging the output.

Nice power supply, I've bought 4 now and all of them have been working fine. The fine voltage adjustment is really helpful.

Small, inexpensive, package with all the features you want and need. This power supply replaces a much larger and more expensive power supply that failed.

This thing is precise. I upgraded my leads and charging cable of course but the unit itself is just amazing for the price. I bought mine to charge and wake up a LTO car audio battery. Which is not a simple, safe or straightforward process if you’re a beginner like me. The quality of this charger is excellent. Screen is nice and bright. It doesn’t make any noise and is compact and sturdy.the cool thing is that it works with basically any type of battery and has a USB port if u wanna charge your phone on it. I wouldn’t mind definitely recommend this to anyone looking for a versatile charger.

A pretty decent lab supply for a reasonable price. I'd been looking for something a bit better than the economy 30V 5A PSUs I picked up years back. Wish these were available at that time as aside from the 2X current output (19A vs.5A) they have far better displays, include a watt display, and USB 5V output. I thought the latter was just fluff but it does com in handy to keep alive that annoying cell phone in a crowded lab bench environment. These bench PSUs are all switching PSUs vs. the older linear copper/iron transformer frankensteins with multiple secondary taps and a battery of relays used to select a voltage slightly above the output such that the linear regulator would burn off minimal heat during regulation. You may need to filter the output some with these switch-mode PSU for critical analog work but for most of my usage that isn't necessary. I might pick up another unit the next time a sale rolls around given the compelling price point.