As has been noted many times, most current USB-PD sources do not offer 5V@5A as one of the available modes. It is an optional mode in the standard.I've used lots of PIs on a boat at 12v. They've always been powered successfully using SEPIC devices.
I've recently bought a couple of PI5s. I suspect that the existing supply will not be enough for the PI5 if I want to use the high powered USB ports.
So I guess that I will have to look at a some alternatives that support USB-C PD.
Most will offer fixed charging modes with 3A @ 5, 9, 15, & 20 V, and then 20V@5A for standard range, and up to 48V for extended range sources . Some also offer variable voltage modes, including 5-21V@5A. [USB-PD spec R3.2 Section 2.8 Table 2.1, 2.2, & 2.3] The higher voltage modes are of no use for the Pi 5, since it will only accept 5V modes.
I think a better bet for non typical power setups (like in an RV or boat) is get a regulator that supplies a solid, well regulated 5V@5A and then set the appropriate software overrides, to get the max USB port current, if required. Does not really make sense to get an inverter and generate AC from the DC power system, only to convert it back to DC.
Statistics: Posted by bjtheone — Wed Apr 17, 2024 12:36 pm
