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.

Works as expected. Voltage verified to .02V with multi-meter. Adjustment knobs are not nearly as bad as some reviews suggest, but do require a degree of fine motor skill to fine tune. I've had no issues adjusting to 1/1000 increments. Suggest getting slightly heavier gauge wires / clips if using as a charger due to some warming at 10A, but nothing I would worry about as a fire hazard.

The dials are very very touchy so it is hard to quickly adjust when needed, but overall it is working great. This does come with the gator clips. I didn't see that in the description so I ordered a set with this only to find out I didn't need to.

This is a very light weight compact power supply for a 10 amp 300 watt unit, yet it is well built. I tested the voltage and amperage display against a Fluke 117 Multimeter and found the power supply to be accurate. t Put the unit under full load for an hour and the coollng fan cycles as it should. For a DYI hobby power supply at the $40 price point you can not do better.

Right out of the box it worked very well. It's easy to use and seems to be made well. I would recommend it.

Great product

works as expected, even when using the fine tune function. Allows me to test equipment before putting it in my projects.

I was looking for a constant voltage supply, and found this one that offers both constant voltage, and constant current. That seemed like a plus. However, there is no mode selection for one or the other. It's always both on. In order to get something like constant voltage you have to make sure that the current setting is above what your device will ever conceivably draw. This means basically that I set my current all the way up to the supply max of 10 amps. Then set my voltage to the constant value I want. The included instructions are very poor, and really don't explain this need.I've seen reviews here which mentioned bricking a connected piece of equipment during a firmware load probably because the amp setting was too low, annd the user diddn't realize it. The supply probably went into constant current mode automatically when the current set was exceeded, dropping the intended voltage level, and ruining the upload.Heck, there ought to be a simple mode switch to select either constant current or constant voltage. But nope, there isn't. Instead there are coarse and fine amperage and voltage setting potentiometers. These are stiff, tend to overshoot, and don't work great either -- I find it tricky to dial in any intended figure. Also there are little indicators for whether constant current or constant voltage mode is currently active. These can alternate back and forth in a confusing way when setting up with nothing drawing.You really have to know to set up either current, or voltage, maxed out in order to set the other one. Maybe others are used to this kind of power supply setup method, but I don't particularly like it. Oh for the ancient days of rotary switches! If applied here you could select constant V, constant A, or off -- just like a multimeter.Wow, that's actually digital: switches, ons and offs, what a concept! Nope better have users change modes with a potentiometer and a digital display and understanding a couple of design quirks. Best keep that out of the manual.