He is able to drive a regular Hakko iron at 20 V and 3 Amps, providing it with 60 W of input power from a USB-C charger. The Hakko is rated for 24 V operating voltage, so it is running about 16% ...

We know what you’re thinking. There’s no way an 8 watt USB-powered soldering iron could be worth the $5 it commands on eBay. That’s what [BigClive] thought too, so he bought one, … ...

As a general rule, it’s worthwhile to pay more for a high-quality soldering iron that comes with an adjustable temperature feature. For smaller projectors, a 15- or 30-watt iron is fine.