XMSJSIY DC 24V to 12V Step-Down Voltage Converter - 100A, 1200W DC Buck Module Adapter - Car Truck Vehicle Power Supply - 1 Pcs

going strong months later

it does not work light comes on but thats allit does.

It can only support 30A instead of 100A.

I've been using this with a 24v battery and a 12v motor for about a week. I've used it for about 10 hours. It's been working great and was easy to set up. I don't have a need for the memory wire so I just have a + and - in from the 24v battery and a + and - out to the motor with a 50 amp breaker between the converter and the motor. The motor is 40 amp max volts. It was very easy to wire. I'm using 10 AWG marine grade wire. I put ferrules on the wire ends and was able to shove them into the unit, but barely. I had previously burned up my motor by accidentally hooking it up directly to the 24 volt motor, so I was concerned about the unit not actually stepping down the voltage. To make sure it was, I used a volt meter to check the voltage leaving the unit, and it measured 13.2 right off the charger, which is what many of my "12 volt" batteries read.I'm confused about the actual amperage the unit can handle. Anything bigger than my motor would need thicker wire and it wouldn't fit into the unit. In addition to that, the unit comes with a 30 amp fuse installed. I'm surprised my motor hasn't blown the fuse because it definitely draws more than 30 amps on full speed. I don't believe it's suitable for 100 amps which makes me have concerns about the quality of the product in general so I could only go 4 stars even though it's working great for my purpose. If you're not expecting to use more than 40 or maybe 50 amps and can get away with 10 gauge wire I recommend this step-down converter.

Needed to step down 24v system on my loader to power my subwoofer. Yes I have a subwoofer in my John Deere 544, love the beats.

The maximum sized wires I could shove into each input lug was 2 - 12ga. wires. The maximum rating I've found for a 12ga wire is 25A and that involves ambient temperatures less than 86°F and cables under 6' long. The maximum allowed for home wiring is 20A. See my picture for documentation.The lugs were also not built to clamp down even 2 - 12ga wires and not even close to being able to clamp the required 3ga wire to carry 100 amps. I stripped the nut trying to get my 12 ga wires snug and ended up soldering them to the lugs until I get back from my 4 week camping trip and can buy a larger machine.Note the properly sized wires going to my 100A solar charge controller compared to the 12ga wires that barely fit in this converter in my 2nd Picture.

Was ok