Comment by krasin

I am currently (as a hobby-style activity) learning guts of the USB Power Delivery standard and found an incredible (and fully open-source) tool: USB-C explorer, https://www.tindie.com/products/reclaimerlabs/usb-c-explorer...

Basically, you attach the board to any USB port and it will show capabilities (voltage and amperage) on a tiny OLED display. And since the firmware is open-source, it's possible to play around and test a lot of what-ifs: https://github.com/ReclaimerLabs/USB-C-Explorer

I am not engaged with the project other than a very happy user.

In other news, the latest USB PD spec allows to pass up to 48V@5A=240W power.