WWZMDiB CC CV Buck Converter DC 6-40V to 1.2-35V 20A 300W Power Supply Step Down Module for Solar Energy, Photovoltaic Energy, Industrial Equipment

Works as advertised. No issues with reducing voltage. Would bye again. Great product!

First one sent to me was erratic and the adjusters did not work. After a few minutes of adjusting it started smoking. Requested a replacement and the replacement works! Feels like a score when you can get questionable to poor electronic quality from you know what country. I'm happy for the price. Expect duds if u can tolerate the hassle of exchanges.

Works great. A proprietary battery for a device I have died, so I used this attached to a big 12v DC battery to simulate the exact voltage and amperage that the broken battery provided and it works perfectly. Very good value for money.

Product is faulty on the putput i am only getting 3.8V even after turning the potentiometer to max

It worked fine.

It’s good

I had two of them that work great for voltage adjustment, but the current isn’t there no matter what. I finally got a 3rd on and it works fine. Solar panels to pond aeration is my application.

It does what I need it to do!