I have found this ST Discovery kit extremely useful in figuring out what my USB-C power sources could actually supply. "The STM32G071B-DISCO Discovery board is

I have found this ST Discovery kit extremely useful in figuring out what my USB-C power sources could actually supply. "The STM32G071B-DISCO Discovery board is a demonstration and development platform for the STMicroelectronics Arm® Cortex®-M0+ core-based STM32G071RB microcontroller and particularly the USB Type-C™ and Power Delivery controllers. ... The STM32G071B-DISCO Discovery board discovers and displays USB Type-C™ port capabilities such as data role, power role, VBUS and IBUS monitoring. ..." https://www.st.com/resource/en/user_manual/dm00496511-stm32g0-discovery-kit-for-usb-type-c-and-power-delivery-stmicroelectronics.pdf https://www.st.com/resource/en/user_manual/dm00496511-stm32g... Around ~$70 US now. Was around $50 when I bought mine a couple of years ago. STM32G071B-DISCO at Mouser or Digikey.