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.

This power supply works exactly as described and is very useful for testing/prototyping on the bench. The course/fine knobs make it very easy to set the voltage and amperage limit but they can be a bit sensitive. The on/off switch being separate from the "power output" toggle is very convenient allowing you to set the values before switching on the supply.

If you can get it set to the output values you want, the supply provides good regulation and is capable of more output than most others at this price. The coarse and fine controls are mostly a nightmare though. You'd think they would mean Volts and millivolts or Amps and milliAmps. No. It just means "big adjustment" and "smaller adjustment". Dialing in precise values is a huge pain. These are pots, not rotary encoders. If you generally don't care about single milliVolts/milliAmps it'll be fine. If your OCD wants 1.000 on the current then this thing will drive you nuts.

Nice little 10w supply, easy to use, very quiet. Only drawback is the v/c adjustment is very sensitive and fluctuates too much. Nice output switch. Measured output is what shows at the terminals. Use it more than my Rigol DP823A

Very accurate, turns off when you push the button, unlike many that takes 2to4Seconds looking to get more

Use this all the time. Works great!

Runs quiet, accuracy seems exceptional, and it’s easy to use. I really like this power supply for testing or troubleshooting, it’s making my life easier.

This thing almost burnt my house down. I went to sleep last night and heard a loud pop. I thought something just fell so I put my coat on to check things out, but just before I left the room, I heard two more loud pops. So I rushed to the kitchen to find my chair on fire (the power supply was on the chair plugged into the wall, but the positive and negative leads were disconnected from the unit, so it was not outputting power to anything). Thankfully the chair was really close to the front door, so I threw the chair outside and was able to extinguish it, but now the house smells like a cocktail of burnt chemicals and there's smoke stains on my walls and ceiling. I got several burns on my left hand and both feet throwing the chair outside.Since I heard the loud pop and saw the chair on fire, I'm going to assume that the fuse (if there was one) failed, making a critical component within the machine blow and then send a spark flying out onto the chair. This would tell me that the build quality for my unit was absolutely terrible. Components would have had to have been connected to the board really poorly or the components themselves severely shorted or poorly constructed. Probably both honestly. I only used it like 5 times since I bought it. had my warranty card tucked half way in the top rear gap of the chassis, so that's gone now. I never expected my unit to just up and explode on me and catch the surroundings on fire.