ACEIRMC 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 experimented with this board hoping that it'd make a decent LiPo 3.8V->12V boost converter. While you can achieve 2A output currents with these settings (especially if you do as recommended and heatsink the board), the device's minimum input voltage is NOT 3.0V, but rather closer to 3.8V (with a minimum current draw of 67mA).At around 3.6V, the board's output voltage skyrockets, its current draw starts to drift upwards and locks at around 0.25A, and the output voltage hits 20, then drifts back down to just above the input voltage. I replicated this behavior with all 3 boards included in the package.DO NOT BUY THIS BOARD IF YOU INTEND TO CONNECT IT TO A 1S BATTERY!This is *incredibly* dangerous behavior for a boost converter that's connected to a Lion or LiPo battery, and without careful testing it'd be very easy to connect delicate equipment to this module, test and calibrate at around 3.8V, and then have a ticking time bomb in your build waiting for lower input voltage.

Don't try to use it at the rated of Amperage, Mine burned up at a 2 Amps draw .. But a great DC to DC Step-up convert for a small current load..

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'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 ;~)

At full load, the modules I received achieve 38V and get very hot. Unfortunately with such a small footprint board, the positive terminals, including the exposed positive pads on the underside, are right next to the ground connected screw terminals leading to very easy short circuit conditions. I found this out when I placed the board on a heat sink and the output wires (to a battery pack) shorted, catching fire lol. That was the battery's fault and that I didn't fuse this connection though so don't blame them for that part. Just remember that these contacts are really close. The module was fine. I like that the components are all nice and beefy, the board is covered in thermal vias to use its ground place as a radiator, and the screw terminals seem very solid. This technique also spreads heat to other components on the board however ;) All traces on the board seem to have more than enough copper for its normal operating range, and the solder joints are very well done. The cleaning and finishing was nicely done as well. The most experienced engineer I work with took a look and also remarked about the build quality. Would be 5 stars if the easy short circuit condition could be resolved. I think the description should mention that additional cooling may be required for operation at full load and 45V is way off from the adjustment range available on the boards I've tested. I will be using these though, and probably will be ordering more. I would use a fuse on the output for safety if you intend to use it with something with also provides current, like in my case with a large battery bank.