DROK CNC DC Buck Converter with Meter, 6-70V to 0-60V 10A 600W, DC 5V 9V 12V 24V 36V 48V 60V Fixed Output Voltage, Adjustable Power Supply Voltage Regulator Step Down Module

Seems to work very well. I'm going from 56v to 25.8v and when I measure with a multimeter it's spot on.

I have had good results with DROK products and when I was looking for building my own power supply using a toroid xfmr, rectifier, cap that had on hand - this DC-DC converter with a nice remote control/display assembly fit my needs perfectly. My power supply "back end" is able to produce 45 vdc at 4 amps and via switching the xfmr leads I can parallel the two secondaries for 22vdc at 8amps. I purchased the DROK model sold for 1200W to make sure I didn't stress the converter board in my application.Since my purchase arrived I've connected misc loads testing the DROK converter. It has worked perfectly so far. While I don't have a handy load to really stress the full power rating; it has handled my 5-150 watt loads using the 45 vdc input with no issues. The small cooling fan turns on automatically when loads over 50 watts or 2 amps are in use. I initally had my doubts the heatsink/cooling fan would do the job given the ad indicated up to 5-6 volt "overhead" used by the converter. So far I have seen around 2-3 volt overhead for my tests and that makes me a lot more comfortable.Prior to initial testing I looked over the converter board carefully for any workmanship concerns. I was pleasantly surprised to find everything clean, neat, and nothing that raised a concern that the unit might fry and die in my first application of power. In fact the only really minor thing I found during my inspection was the rectangular plastic cover over the display was attached skewed. Hardly a problem! Also, it's not mentioned in the front/back single page of instructions but when you cycle through the power/capacity/energy/time parameters using the encoder button you will also get an operating temperature reading after the time parameter which tells you the converter board temperature in degrees C. A nice feature when working the converter at high voltages/currents.One other oddity I found with the instruction sheet parameters is that the overcurrent protection is listed at 16Amps and output over power protection is set at 950Watts. Those don't match up to either the 0-10 amp or the 0-20amp models listed on the datasheet. For my purposes the default settings are fine but might be a concern for others wanting to use the maximums of this converter.I have no use for the serial communication interface or the fixed output voltage settings so can't help any reader with those aspects. The display controls take a few minutes to understand; but one thing I found helpful is just being patient and letting the timeout take effect rather than cycling through additional features/functions. There is a useful key/interfaces table on the supplied page of instructions that I found very helpful.In use, you will need to get used to a ramp up/down during power on/off. Think of it as the controller is constantly measuring the output and comparing to the setting. This results in the output voltage ramping up from 0 to say 15Vdc over a second or two - slow start so to speak. In addition you will likely see a small overshoot to your voltage setting in order of millivolts to 10's of millivolts. For a 12vdc fan test I would see the voltage overshoot to about 12.24 and then settle back to 12.0. During power off the voltage would gradually drop to 0 over about 3-4 seconds. Also, when power is initally applied to the converter the display will show zeros for everything for first few seconds and then display the last voltage/current limit settings. Best to wait to turn on the load until after you see the display has the desired settings.So far I'm very pleased with this DROK converter - exactly what I wanted for my power supply project and with the additional AH/WH/Time features it would be a nice addition for a solar/wind/battery system when need a lower DC voltage than what the battery bank provides; i.e., few hunderd watts of 12vdc from 24 vdc battery bank. Now I just need to get busy cutting a mounting hole for the display in my metal cabinet!

Getting frustrated. Was pumped to get this thing. It never would work. Messed and messed with it. Read the instructions a 100 times. Control block never would turn off. Would only push out 12v on the outgoing. Never would decrease. Could turn the amps all the way down and it would shut off like its supposed to. But would never decrease anything.

4 stars for now. Packaging solid. Seems well built most soldering is nice and a very nice day sheet with board and control box layout template and as tested a little bit, it does what it supposed to do. It'll be put to work at higher voltage than used to test it. 4 stars until it's longevity and voltage stability over use times. Will be mounted inside a cabinet with good air movement.

Once I got the mounting setup, this took me minutes to setup. Easy and straight forward operation. Used it to step down an 48V UPS battery output that was over driving to 56V. Work like a charm. No issues supplying battery power to the Access Control system while power is out. It gives a nice wattage and ampier output reading on the LCD screen too, making my battery calculations a sinch.

Good converter works as advertised. Happy with purchase

Worked great for a little over a month of on and off use. Its last use was using it to power a zvs driver, shortly after turning off the output one of the mosfets shorted and put the whole input voltage of the unit to the output, which didn't kill the zvs driver (miraculously) but did destroy the transformer it was powering, and I had to unplug power from the wall since trying to turn it off from the power button wouldn't disconnect power. Tried replacing the mosfet with a near identical one and the unit still doesn't work right, not really worth digging deeper to try to fix. Still have no clue what made the mosfet in the unit short while it wasn't outputting any voltage at all. Oh, and the mosfets on the unit were barely screwed on to the heatsink from the factory, with no heatsink paste either. I guess i get what I pay for, with this things price. When it did work, though, it worked well, handled 500 watts output no problem.

Use this to power the kids 24V power wheels with two Milwaukee M18 batteries in series.