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Are you sure about the 3.5W? That seems high. An iPad at idle with the display on uses less than that.

About 3W is realistic for a Pi 4. Here's a comparison:

https://www.pidramble.com/wiki/benchmarks/power-consumption

I use RPi 3B because of lower power consumption than 3B+, 4B... It is around 300mA. I connect power cable to USB from router that has 500mA output. It works great.

RPi 3B+ has sometimes problem with stability because of higher power consumption.

Official power supply of RPi is 2,6A if I remember correctly, so 3,5 is not even possible?

Btw, many routers support sleep mode. It is not necessary to run router/connected RPi 24/7.

Watts vs. current.

At 300mA, that's 1.5W of power.

Maximum current draw on a pi4 is 3A (~15W), but that's purely a power supply input limitation. You only get close to that with a ton of peripherals and heavy load on the Pi.

Ah, yes, sorry, my mistake.

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