Alles anzeigenI agree with @jeroen warmerdam as he mentioned the USB thing previously an it got stuck in my head as i power mine that way. So i had to do some checks just to make sure I was not victim to that, It just kept niggling away at me so the meter came out.
Official specs:
Micro USB / Adapter limits the Pi supply down to 2.4 - 2.5A instead of the official 3A if using the proper type C connector, This is to allow you to use your older pi charges on it. So its semi intelligent, you either get 3A or standard Pi current.
I ran tests on that earlier and with 2x usb2 devices running and the GPIO in use it pulled a max of 1.6A with both in use, I didn't try charging a smart device I will later to see where it maxes out at.
In theory you could also run it that way as long as you are not heavily dependant on usb3 devices being used on the pi that would take the total current draw to around the 3A mark.
All you would need is a spare micro USB cable to sacrifice and a micro to USB-C adapter
Or you still have that option ^ which allows you to use the 1 PSU, proper power port which will give you the inbuilt protection and remove the undervoltage warning.
Providing you are not connecting a lot of high demand USB3 devices then it should be more than capable of running the pi4 without any problems as 2.4A is still a lot of current, ( most pi's wont use anywhere near 2.4A) and if you are not using many devices then it should solve your problem and meet your requirements.