Constant Current CC CV Buck Converter Module DC 6-40V to 1.2-36V 20A 300W Adjustable Step Down Voltage Regulator Power Supply Module with Short Circuit Protection Function

I have several of these buck voltage reducers. I use them for powering cameras and Infrared Sources in the woods. I run ~40 volts out to them on 16 or 18 gauge wire.I found the biggest issue is being careful not to over torque the connection screws. They are NOT anchored well to the circuit board. I wanted to be sure to get a good connection as these are installed in weatherproof boxes mounted to the trees and not the best accessibility. On the second one I used the terminal block twisted right off. It's hard to apply a lot of torque when using jeweler's screwdrivers!The other issue I had was with the current limiting circuit on one. No matter how much I adjusted it, it would trip at about 2 amps. Every time the IR lights tried to come on at night the camera would crap out. Then I knew I had to reset the device by killing the power to it. Solved by replacing with another.

Terrible build quality and wouldn't put out more than 10 amps no matter how much I adjusted the current setting.The terminal connections are way too small to handle advertised loads. I'm surprised they didn't fall off the board entirely.Update: Shortly after writing the above, one of the capacitors blew spectacularly. Amazon refunded me at least.

I used this product as the regulator module for a 25a 13.5 volt DC power supply I built. It works well. I'm converting about 22v down to 13.5v and I have pulled 25a through it with no problem. It runs cool and I get very little voltage drop the no-load voltage when at full load. My only complaint is that it comes with no instructions at all. I had to look at the picture on the Amazon product description to see how to adjust it. Still don't know what the soft start does. Would be nice to have a little more info.

First things first.Packaging was inadequate. It arrived from Amazon in a soft-sided shipping bag. This is unacceptable for any open-frame electronic product. Though the device itself was in a Mylar foil bag, the anti-static bag should have been packaged in an external cardboard box of some kind.Echoing previous reviews: both input and output screw terminal blocks are soldered, through-hole components, but there is no additional mechanical reinforcement for those board components. There are no load-bearing, through-hole plastic bosses to relieve any torque applied to the screw terminals. In fact, the output screw block on my device dropped out of the foil bag separately from the primary device. I had to re-solder the screw block in place.Heed the advice of other reviewers, and DO NOT apply too much torque to the screw terminals.I've so far ramped up the output to ~ 8 amps at 12 V, with 12 V input. Both CV and CC adjustment pots seem to be responsive. However, my load is purely resistive, so it's the ideal case.So again, mind the other reviewers' observations and be aware that there is no load isolation, so inductive and/or capacitive loads may back-feed when the input power is abruptly removed, overloading components.I'll update this review as my project progresses. If there are no updates, that means there is nothing new to share.

Bought this to charge a 4s3p battery pack from a 19v source. Tested the module up to 5A but plan to use a 3A charge rate. Module runs cool at this amp range, and leaves some headroom to add another pack if needed.At one point, I adjusted the voltage down to stop charging. BIG mistake. I saw 32v on the input of the module before getting the battery disconnected. These modules have no isolation and operate in reverse (like boost) from such a mistake. It blew the 25v capacitors in the source. After changing the capacitors out, I added a schottky diode between the source and the module. Now looking into ideal diodes since it gets hot.Bottom line; Don't make voltage adjustments with the battery connected unless you have a diode before or (preferably) after the module isolating the battery from your source power supply.