HiLetgo 3pcs XL4015 5A DC to DC CC CV Lithium Battery Step Down Charging Board Led Power Converter Charger Step Down Module

Seems to work well with 24V supply at 12V (nominal) output. Note that the pots adjust such that clockwise gives higher volts, higher amps. Counter-clockwise is lower volts or lower amps. The LED near the output is on when it is outputing. The LED near the voltage pot is on when it is current limiting. I had to turn the pots many turns counter-clockwise to see any effect on the output.

Worked as advertised, although I did have to spin the small brass voltage adjustment screw a good many rotations till I stated to see the voltage drops on my multimeter, I wish this would of been listed in the description since I though I had broken buck converters.I also didn’t use these to charge things, I used them as converters from high to low voltage from a 12v 10A power supply to 7.2V to run 1-2 MG995 servos. Worked great

All three boards I received tested good. As another purchaser mentioned, the terminals for POWER IN +/- and POWER OUT +/- are cheap and the screws are difficult to loosen. The potentiometers require many turns to make any changes to voltage or current, but this is desirable because it allows for minute adjustments. Ensure that voltage is adjusted BEFORE connecting a load to POWER OUT +/-, and current is adjusted AFTER connecting the load. Additionally, do NOT connect a load if the board is not powered because you risk damage to the circuitry.I used the boards to recharge 12v lead-acid batteries. So far, the only issue I've experienced is overheating. I mounted a cooling fan to the board and it's performing well. I supplied the board with a laptop charger with an output of 19.5v DC at 4.45A. The board is outputting 14.4v DC at 4.85A under load. I am still trying to determine exactly what the LEDs indicate. There are three, a blue, red, and a green. The red seems to fade out when the battery is near full charge. Nothing has blown up. Yet.

Works as designed

These are not plain buck converters. They have a shutoff feature when battery or device matches the set output voltage. However, it does not shut off output permanently.Once a battery reaches full charge it will stop but as the battery begins to rest and drop below the set voltage the converter will continuously kick on to maintain max charge which will eventually burn up a battery.For small monitored applications I would say these will work but do not trust them to maintain an expensive battery bank.

The s.... Biggest one I've ever bought, wasted money, none of the 3 worked 😭.

I like they are so stable on the voltage output and the current limit setting is really good too.

They're are quite a few varieties of these cc/cv charges controllers so if you're looking for specifics, be sure to research.I've got one working as a solar charge controller, another as a step down converter for my 12v devices and another as a cc/cv regulator for my motorcycle lithium battery. They've all been working for many, many hours and are still going strong. Had them for a few months at least.P.S. - Don't push them past 5A unless you are cooling them. If you even wanted to cool them at lower amperages it would probably extend their life.Anyhow, hope this helps. Cheers!