I soldered a 45W car charger to 4 pin XLR and tried charging my macbook. Although it charges at first, a few minutes later it breaks the connection due to what I think is the "Power Delivery negotiation protocol". I guess the computer negotiates a voltage, and wattage through a circuit board found in apple brand ac adapters, and other licensed by apple products. After doing some digging, I found this:
USB Type C Power Converter with 5V, 9V, 12V, 15V & 20V Power Delivery - PD60: https://www.bixpower.com/ProductDetails.asp?ProductCode=BX-DD60PD&CartID=1
Anyone have success with cheaper alternatives? Thank you