Imperf3kt wrote: ↑
Tue Nov 26, 2019 9:17 pm
davidcoton wrote: ↑
Tue Nov 26, 2019 9:11 pm
Poor guess. Many PD PSUs can only supply the full rated power at higher voltages, the current at 5V is just too high.
I don't see why. 5v 3A is listed in usb-c spec.
The Anker power supplies have all had very high regard here from dozens of forum users.
The USB-C spec requires 0A9, not 3A. The PD spec mentions 15W at 5V, and 60W at 20V (IIRC). Since the 60W figure does not allow full power on two sockets simultaneously at 20V, but only a total of 3A, does the same current limit apply across both ports at 5V, or can each port supply 3A? The spec is not clear about this, it would need to be tested. Or ask Anker that specific question before buying.
Also, the OP asked for "multiple" Pi4 supplies. Does two count as multiple?
My choice would be as @dustnbone suggested: an industrial supply, but with individual polyfuses for each Pi. It may also be that the cost of an official PSU for each Pi, together with multiple mains sockets, is cheaper and easier than a single PSU for all of them. Note that a single PSU introduces an additional single point of failure, which may or may not be significant in the OP's application.