On a PC, the stock USC A jack is current limited to 500ma max. I made up my own custom power cable that plugs into a 5V 4A regulated switching power supply. It powers my two panels and the i75W. Then to prevent that from trying to back power my PC through the i75’s USB C jack, I modified a spare USB C to USB A cable I had on hand. It’s now Data only. I cut the +5V wire.
Interstate 75 with multiple HUB-75 LED matrix panels - Support - Pimoroni Buccaneers