We have an off-grid solar system for campers using our lake pavillion. We currently have two outlets designed to fit in a standard electical box each having 5 ports for USB-A cables for phone and tablet charging. These two outlets are connected to 12v DC from our solar system. See bottom right of attachment. We would like to find some USB-C connectors to replace these two outlets so they would need to fit in our existing cuttout and powered by 12v. I cannot seem to find anything like that on Amazon. Does anyone have a source for something like this?