3pcs XL6019 5A High Power Current DC to DC Step-up 5V 6V 12V 24V 3-35V to 5-40V XL6019 Converter Adjustable Voltage Regulator Power Modules Boost Module Booster (3pcs)

I've built a home made stack of 18650 cells, every cell individually fused, for hurricane preparedness and needed to step up 3.6 to 4.1 volts up to 5 volts for all the cell phones and other rechargeables in the house. This step up converter has so far tested well for the purpose. (even runs usb fans and lights well) One caveat... Make sure the resistance between source voltage and the converter is very low ohm, and you may want to add an extra electrolytic and mylar capacitor across Vin to keep the converter nice and stable. To thin a wire on input can allow this regulator/converter to get unstable which leads to excess heat/inefficiency. Had this happen. Fixed by jumping to 14~16 gauge and adding aforementioned caps. I'd suggest a home made crowbar circuit to keep any over voltage from accidentally damaging any usb circuits as well. AND DON'T FORGET TO FUSE 9-] In this old techs humble opinion ;~)

I purchased this item to power a WIFI radio off a 12v car battery and solar panel. The radio is POE and 12v wasnt quite enough. Using this device I stepped up the voltage so the 300' network cable losses would be overcome. Worked exactly as expected. For those of you who do not understand electronics, this device is rated 5 amps at the lowest voltage. (5X5=25Watts) If you step the voltage up then the number of amps it can output will drop. Example: 15v is 1.66A.

I'm getting 38V max from 12V in, but it was getting stupidly hot! A 20mA string of LEDS, consuming 760mW, required 210mA (2500mW} from the battery! Where did the remaining 1740mW go? Even with no load, it took 140mA (1680mW) from battery! Where did this go? Then I chopped out the LED indicator on the board. With same output, the input dropped to 80mA (960mW), and with no load it only took about 20mA (240mW). Wow! With my load the power reduction was 2500-960=1540mW. and at no load it 1680-240=1440mW. Almost the same saving of about 1.5W. This is much more than the LED indicator alone, and there is no longer heat build up ! Even if their LED is run from output voltage via dropping resistor, that is only 20mA x 38V =0.76W not 1.5W! This may be a bad design, certainly the efficiency is terrible (760/960= 80%) but at least now it runs cool! I hope this helps. So I recommend you break off the LED once it is working for you. Then it will run nice and cool! These have excellent regulation as long as you read the instructions - don't try running them from very low voltage, like under 5v !

The most unreliable and poorly designed produce I have purchased from Amazon. I use a lab power supply to test it. Attached on the output end a high precision bench multitester. I suppled input voltage in 1 milli volt increments, from 0 to 3 volts and limited the current to only 0.5 amps to start the test. Long story I noticed extreme output voltage fluctuations that happened randomly. The output voltage swings between 7and 14volts for no apparent reason. No swings in current consumption at all. I also noticed that if I would interrupt the input voltage, the output voltage would change on its own down to 3,4,5,6,7 volts or 14, 8,9,7,4. Etc etc each time I reinstated the input voltage. I played with the little trimmer and I was able to set it up for output of 30volts with no load at all but any fluctuation on the input voltage will change the output by a large margin. Remember a lab power supply with a change of 1 milivots would mess up the outbound plus if I kept the input voltage constant, the output voltage would change each time I disconnected and reconnected the input voltage. It gets better!!! I tested with and without load to the output same voltage swings, I even added an output capacitor and no help. Gets even better, it began to get hot within five minutes, I took thermal images with temperature readings. Remember the voltage swings? Getting hot without load, I did not even bother to hook it up to the oscilloscope, sine this was low cost garbage why spend the time. Even the small capacitors nearby got hot. That is capacitor death in the near future. I imagine the cuircuit was oscillating out of control. I don’t know. Imagine connecting a 6 volt anything to its output only to fry your item when the voltage swings to 14 or 15 volts randomly? And then you turn this thing on, gets even hotter with a small load on and boom! There goes your project. I also connected it to a 3 volt lithium battery and the voltage output was in full swing again. Garbage. See the thermal photos ad look at the temp readings. Those were without a load.

Bought these to run a 24v circuit on a milwaukee drill battery and it did just what it advertised.

Been using these for a long time I keep buying more, they work great.

I noticed that when connected to batteries, which slowly drop in voltage, the output voltage of this boost converter will get very suspect. For example, I had the output set to 6 volts, and everything went fine for a while, but when I took the multimeter to check the voltage, it was 17V! I couldn't believe what I was seeing. I checked the battery input to it and it was slightly under 4V (originally the batteries were outputting 5.4v).

I tested these on the bench. They work as advertised. 5v input to 35v output. I am using for 12v to 24v. I was happy to see the output was regulated, so even if I lowered or raised the input, the output didn't fluctuate. They are rated for 5A. I haven't used under load yet. Will report back if I have any problems. The build quality is excellent. Screw downs are larger than most and strong. Input is one side. Output is the other. The potentiometer adjustment is solid. I've seen really weak ones, but these are tight and move the voltage predictable. These are an excellent buy. I will spray with acrylic/conformal coating to protect the circuit.

Very inexpensive and works great for my use case. I have a 12v battery system with a couple of solar panels, but my lamp needed 24v to run. This was a cheap and easy solution.

Doesn't work

work well