I'm looking to power my Raspberry Pi 4B from a 12V tractor battery. I have a buck converter which can be found here. I am considering using this device to step-down the battery voltage and hook up the output of the converter to the GPIO pins of the Raspberry Pi. The other option I am considering is to to use this USB-c step down converter found here. I know the usb-c connector on the Pi is safer because of onboard regulators/fuses. My only concern is that this converter is only rated for 15W(5V 3A). Will that be sufficient? Important Info- I plan on connecting a Mirabox capture card to the USB-c port. See here. It will thus be powered by the Pi. Accordingly, I am afraid of current spikes(etc). Any advice is appreciated. Hopefully, my post is clear.
Would it be possible to open up a USB-c cable and connect the VCC and GRD to the output Terminals of the Buck Converter and ignore the Data+ and Data- cords? My reasoning is that the USB-c normally just recieving DC current anyway. I don't believe the Pi would receive serial communication from the outlet(AC/DC adapter/transformer).