General discussion • Re: Raspberry Pi5 USB-C PD

I also need to power the PI5 via DC power.

I found a couple of car chargers that, on paper, are capable of delivering ~5v/5A (or close @5v/4.5A).
I already have one of those (the 4.5A one), it has 2 USB A ports, supporting a bunch of protocols (QC3.0 / QC2.0 / SCP / AFC / MTK PE), but no PD. So I'm not sure this will work at more than 3A with the Pi.

The other one I found on Amazon, it's called "[some chinese brand] Warp Car Charger 30W [5V/6A] for Oneplus", which should deliver even more power than needed @5v/6A!! Same story, protocols supported: "Warp Charge, Dash Charge, QC 3.0/2.0".

Another issue is the cable, there's no USB (type C or A) that's rated specifically at 5v/5A. I bought one (type A to C) that's rated to 20v/5A (100w) in the hope it will work with the car charger mentioned earlier. I don't have low voltage warnings, but usb_max_current_enable is set to 0, so no dice.

Apparently there's no such thing as PD via USB type A, so all I tested and said above is useless (to put it mildly).
With that in mind, I did find a car typeC DC changer with PD @5v/4.5A lying around and using a typeC cable rated @100W I started a stress test.
During the test there was no throttling, no low voltage warning but usb_max_current_enable is still 0. The drawed power peaked at 8W with nothing but the ethernet and power connected to the PI (except the official active cooler).

Is there a way to make sure this combo (power supply and cable) is being used at capacity once I'll connect some USB consumers (other than manually changing usb_max_current_enable to 1 and start praying)?

Statistics: Posted by bensimmo — Tue Jan 16, 2024 10:11 pm