Rookie USB-C Question

Discussion in 'Alternatives to Mac Hardware' started by Gutwrench, Jul 28, 2019.

  1. Gutwrench Contributor


    Jan 2, 2011
    I’m seeing monitors offering USB-C connections to simultaneously drive the display and to power the laptop.

    Does USB-C provide sufficient current to keep a laptop adequately charged when using it for 8+ hours at a time? ​
  2. chabig macrumors 603

    Sep 6, 2002
  3. Gutwrench, Jul 28, 2019
    Last edited: Jul 28, 2019

    Gutwrench thread starter Contributor


    Jan 2, 2011
    Thank you. It didn’t make sense to me that it wouldn’t, but a genius bar person said at my office (not Apple Genius Bar) said it wouldn’t.

    Best wrong advice I received though, because I bought an HP Thunderbolt Dock and run all peripherals through there (three monitors and Plantronics headset). Simply plug the dock into my laptop and I’m up and running.
  4. dwig macrumors 6502a

    Jan 4, 2015
    Key West FL
    Yes and no.

    USB-PD (Power Delivery over USB-C cables and connectors) has its limits. All power sources (Monitors, Wall-worts, hubs, and docks) have their limits and not all support the USB-IF's maximum PD levels. Also some cables don't support the max current levels. Also, any hub, etc, in the chain will draw some power for itself an other connected devices.

    If, and only if, every piece in the chain (cables, power supply, hubs, ...) support a wattage equal to or higher than the notebook or tablet plus all other connected devices require will you then be able to have the notebook/tablet run totally from the USB-PD power and not drain the battery.

    To accurately answer the OP's question, we need to know what is the exact power requirement of the notebook, the power that is supplied by the monitor, and the power rating for the cable.
  5. Gutwrench thread starter Contributor


    Jan 2, 2011
    Thanks much. I’ll research those variables.

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4 July 28, 2019