DC 17-60V to 12V Step Down Converter,24V 36V 48V to 12V 5A 60W max DC Buck Converter,IP67 Waterproof Module Volage Regulator Transformer Adapter for Monitoring System,Truck,DIY Project,car etc.

I am now using this to power a Cisco PoE ethernet switch from an old laptop switched power supply that supplies ~19VDC to this device's input and the converter's output provides stable 48V power to the switch.Overall, this converter is nicely packaged with a 10A fuse on the input side and quick-connect wiring connectors on input and output, excellent regulation and efficiency.I was able to test this converter at up to 1.5A input current with the 12V - 24V variable power supply I had on-hand. Efficiency is the ratio of output power to input power. I used an electronic constant-current load and measured the delivered voltage and current as well as the supplied voltage and current to obtain the following:TEST RESULTS (see photos)At 12.0V DC supply: the idle current is about 70mA. With the 48.0V output delivering 0.3A into an electronic load, the input draws 1.5A for efficiency of 80 percent at 14.4 Watts from 18 Watts input.At 24.0V DC supply: the idle current is about 50mA. With the 48.0V output delivering 0.6A into an electronic load, the input draws 1.4A for efficiency of 85 percent at 28.8 Watts from 33.6 Watts input.The voltage was very stable at 48.0V regardless of the load current and the device remained entirely cool to the touch after many hours.

I picked this up to keep my phone charged on my ebike. My bike has a USB port that only puts our 5v at 1a. That 5w charge rate is not enough to charge my phone. With the screen on and using it with some GPS mapping software, it uses more power than 5w and so the phone slowly discharges even when plugged in.This step down converter can take the direct output of my ebike battery. It's a 52 volt system that has a peak voltage of 58.8 volts. This step down converter brings that down to a standard 12 volts at 3 amps. I can use a fast car charger to charge my phone at a faster rate.For testing I used a bench power supply that would only put out 30 volts. The step down converter brought that down to about 12.5 volts. I connected a car charger to it and used a USB cable to charge my phone. My phone was fast charging at a 15 watt rate, 3 times faster than the USB port on my ebike! If I get a more powerful car charger I'm sure I can get my phone to charge at the super fast charging rate of 25 watts that is the max my phone supports. The maximum output of the step down converter is 36 watts, so I will not be able to use a 45 watt charger.The step down converter has a 5 amp inline fuse and some wago style clip connectors. I'll keep the fuse and not use the wago connectors. I'll solder and heat shrink my splices.

Update: working perfectly after a month. Have purchased another to mirror the battery/PoE setup.Easy to connect with quick connect terminals. Maintains 48V regulation (tested only up to 0.5A load). Runs cool.Used to power a PoE injector from a LiFePo4 battery. Worked perfectly!

This is rated for an output of 12 volts, but the unit I got outputs 12.30 consistently. Some degree of margin is probably normal, and it isn't enough to upset any of my 12-volt devices, but I do wish it were a proper 12 volts as rated.When pushed to maximum load while testing this heated up to practically molten in seconds, so hot that I couldn't touch it, and part of the body swelled up in two places almost instantly. I have no way of knowing if that's just heat pressure in the metal body or a swollen capacitor about to blow, since the device is completely sealed.Since testing this out under harsher conditions to evaluate it I'm just using it with a small 12.8 volt LiFePO4 battery (which ranges between 14.6 and 11 volts in use) to regulate the voltage for a 1.8 amp maximum 12 volt security camera device, and it is doing fine for that at least.The easy-wire clips are cool, they saved me a lot of trouble trying different connections to evaluate it, but now that I've decided the most I feel safe using this for I'll just be hard wiring it anyway. With the heat and swelling under just seconds of moderate use it had though, I'm not really thrilled with it, and wouldn't use it for anything much stronger than a single small camera or something hooked up to a low-voltage battery.

Theres a little variation in the output when you go from min to max on the input, but thats to be expected. Otherwise, its well within the tolerance of the circuit im trying to run off a 36vdc forklift which varies. This covers the entire range of float from the main batter. Will get again.

I use this for some fans in my 3d printer that take 12vdc and my power supply in the printer only supplies 24vdc. Does the job easy as can be. I tested against my bench power supply which unfortunately can only test up to 25v not the full 40v this is rated to but from 9vdc-25vdc that I tested with this regulator maintained a consistent 12.25vdc output.

I have a 24V battery array coming from my solar panels. I often need only 12V to power small motors or 12V electronics that are so ubiquitous these days. This devise steps down that 24V to 12V, and can handle up to 3A, which us usually plenty for what I use it for. They include a fuse holder in line to protect the 12V devices which is a plus since I don't need to wire one in. For only $12, this is a bargain and I recommend.

Plastic block sealed with resin. Wires getting out of that resin at the bottom. Nice bulkhead (cage clamp) terminals to connnect wires. I used it for out 20W load, hold voltage well.The fuse on the primary side feels much oversized at 10A.Price is rather above average.