HiLetgo 5pcs DC-DC Buck Step Down Module 6-20V 12V/20V to 5V 3A USB Charger Module

I bought 15 of these, and run them directly from Creality Ender 3 printer power supplies (which are 24V), so that I can integrate my Pi's into the printers, and also free up precious wall plugs that I was needlessly running out of by using pi power supplies. The first batch of these arrived all bent up inside their bag, and I had no issue with them replacing them. Out of the 15, I had one that would not power on, and one that would give me the lightning bolt icon in octoprint, signifying that the pi was not getting enough current. All the other ones worked flawlessly and had no issues with underpowering even the pi 4's. For the price, and the ability to supply enough power in this small form factor, I can overlook 2 out of 15 of them being bad. Also, I saw earlier comments stating that they did not have positive and negative marked out, but they must have rectified that because mine were labeled.

I built a project that requires 12volts DC but also includes a Raspberry Pi 3B+ which runs on 5volts from a USB port. I tapped the 12v supply to feed one of these modules and was able to simply plug in the pi with a short USB cable. Seems to work fine, and saved me from having to use two separate wall warts just to power this project. The boards arrived as two sets of three modules each, so you need to separate them yourself. The PC board is lightly scored between modules so you can snap them apart. I’m sure the remaining ones will find a use in some future projects.

The plus and minus not labeled and no literature so I cam back to see if I could find some info. Someone else posted a photo saying theirs are labeled now and it had been a problem, but as you can see, mine are not labelled. I must have gotten old stock that was not labelled. I haven't tested it yet because it wasn't labeled and not literature but I will try going off the photo that someone posted showing one that was labelled. Can't give it a 5 star rating it the terminals aren't labelled. Sure it says it has reverse polarity protection so perhaps if you wire it wrong you could reverse the leads but .... I prefer to be able to to the job correctly the first time.

As described

I have a rechargeable video doorbell I wanted to keep solar charged. I obtained an 18V solar panel (intended for other purposes - which I had to modify) and needed a downconverter. These seemed perfect - and indeed they were. In full sun the solar panels produced 18V and the converter output was a comfortable 5.25V. As the doorbell battery is good for more than a week, I doubt I will now ever have to remove it for recharging. I did use a thin blade hobby knife to score along the line between devices with no problems separating them. I doubt my application draws more than 0.5 Amp (2.5 Watt) peak so cannot confirm the 15 Watt capability claimed for these. And OBTW: the input resistor is an R100 which is 0.1 ohms, not 1.00 ohms.

These are economical modules, and they do what they say, but I'm finding some really annoying limitations. I tried using them with DeWalt 20v batteries to step down to power an Arduino through its USB port. The problem I'm hitting is that the adapter works well with a battery at 70% charge or lower, but if I plug in a freshly charged battery, it outputs nothing. So frustrating... The actual battery voltage when fully charged is probably 20.4 or so. But there must be an internal cutoff and it just doesn't produce any output when the input voltage is over 20v. And yes, you would have to solder on the + and - wires. The board has those labeled well. I would have preferred to have bolt-on connectors for a little more money.

Great emergency USB power ports, add one to a car or truck and set someone up with charging their phone. the wide input voltage range allow connection to about any solar panel or low voltage DC system and get a charge port.

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Jai acheter ce produit pour faire ded chargeur a partir du source de 18 volts(batterie). J'ai fabriquer 10 unitée... les 10 unitées ont allumées la premieres foies pour ensuite produire une fumé et mourire... Desapointé