In which case using a single PSU with two cables - one going to the Pi 5, one to the screen should work, assuming the PSU can supply enough current without dropping its output voltage too much.It won't be 40W. It will be 5V 3A which is 15W. As you say, okay for a Pi with limited peripherals, but unlikely to work with SSD if the CPUs are ever busy. As long as the cable is short and fat, the losses at 5V are not going to be critical, as the Pi's circuits all use lower regulated voltages. At worst, peripherals using 5V will suffer.Should work from cheap block with 40watt for type C to Pi 5 and 15/20 watt for the screen that needs only 8 watt. But Pi power uses 5.1 volts instead of 5 volts to overcome cable resistance. Some cables have too much resistance to use ordinary power supplies.
[/quote]
Indeed, and the OP has identified such a supply which should be suitable -- my point was that we all need to understand that "specmanship" ensures that PSU output power is quoted for the best case -- usually the highest voltage. But for powering a Pi, only the power available at 5V is relevant.
Statistics: Posted by davidcoton — Sat Jul 13, 2024 3:53 pm