USB Multiport (HDMI) Charging Rate?

Discussion in 'MacBook Pro' started by bmustaf, Nov 19, 2016.

  1. bmustaf macrumors regular

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    #1
    Using the pass-thru charging on said adapter results in a 6+ hr recharge time. Directly into a port it goes down to 50 mins or so.

    Is this dongle not 87W/full power rated? Ugh.

    15" Touch Bar MBP.
     
  2. Brookzy macrumors 601

    Brookzy

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    #2
    It can support up to 60W on the passthrough according to Apple. Those times seem out of whack though. Install CoconutBattery and see what the reported charging rate is on a direct connection vs. passthrough?
     
  3. Yoshimura macrumors regular

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    #3
    The USB-C Digital AV Multiport Adapter is good for 60W. But 6+ hr recharge time doesn't make sense.

    50 min x 87W / 60W = 72 min.
     
  4. bmustaf thread starter macrumors regular

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    #4
    Yeah, that's a good idea, I'll do that. Knowing that it's 60W helps, but as Yoshimura said as well, that still doesn't explain the disparity, I wonder if the controller on the dongle has some wonkiness that further limits pass through charge rate in some situations.

    I'll load the thing down similarly and check coconutBattery.

     
  5. Brookzy macrumors 601

    Brookzy

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    #5
    To clarify:
     
  6. zhenya macrumors 603

    zhenya

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    #6
    @Brookzy where does the 60W spec for the Apple adapter come from? Thanks!
     
  7. Brookzy, Nov 19, 2016
    Last edited: Nov 19, 2016

    Brookzy macrumors 601

    Brookzy

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    #7
    @zhenya - near the bottom of this support article. :) https://support.apple.com/en-gb/HT207256

    Screen Shot 2016-11-20 at 03.47.32.png
    --- Post Merged, Nov 19, 2016 ---
    Also, OP: I have read occasional reports of the Multiport adapter being finicky at charging when it is connected all at once (especially with a USB-A device attached). To be completely sure it might be a good idea to restart your Mac, connect the USB-C Multiport, and then connect the USB-C Charge Cable, and then turn on the power outlet.
     
  8. AlanShutko macrumors 6502a

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    #8
  9. xraydoc macrumors 604

    xraydoc

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    #9
    When I've got my power supply (13" nTB) connected through my Apple multiport VGA adapter, Coconut battery reads the charger is putting out 55w. Without the adapter, Coconut battery reports 60w.
     
  10. Brookzy macrumors 601

    Brookzy

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    #10
    The active dongles like these Multiports do, yup. Gone are the days of dumb wire to wire cables!
    --- Post Merged, Nov 19, 2016 ---
    Thanks for this, proof the Multiports can support high wattages.
     
  11. xraydoc macrumors 604

    xraydoc

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    #11
    I'm at work this morning and I'm able to test the Apple HDMI multiport adapter. Coconut Battery is reporting the same 60w without adapter and 55w through adapter as it did with the VGA multiport adapter.
     
  12. Brookzy macrumors 601

    Brookzy

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    #12
    Good stuff. I assume the 5W difference is either some voltage drop in the adapter, or just a reporting bug in coconutBattery. Either way it will be unnoticeable in practice. :)
     
  13. zhenya macrumors 603

    zhenya

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    #13
    I'm fairly sure it's power that is used by the adapter itself. Apple's documentation states that this adapter will drain the battery if plugged in even when not in use.
     
  14. Brookzy macrumors 601

    Brookzy

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    #14
    I was thinking that, but 5W is a bit steep to be consumed by the adapter, especially as a percentage of 29W. Maybe it 'reserves' 5W for power output from the USB-A socket since coincidentally the most the USB-A socket can put out is 5W (as confirmed by connecting a high power device and checking System Information). I will be surprised if the adapter consumes 5W because the battery drain I've experienced in using that cable without AC does not appear commensurate with a constant 5W power draw. As you say it consumes some power but surely not 5W?
     
  15. Wowereit, Nov 20, 2016
    Last edited: Nov 20, 2016

    Wowereit macrumors 6502a

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    #15
    If he is using the device simultaneously this might differ way more.
    Example:
    You are rendering some stuff drawing a grand total of 50W of power.

    Now your battery will only charge with 37W vs. 10W, that's a 3.7 times difference.
     
  16. Brookzy macrumors 601

    Brookzy

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    #16
    Has anyone got a 15" MacBook Pro 2016 and a Multiport adapter? Will be interesting to see if using an 87W power adapter with the Multiport makes it report a full 60W in coconutBattery (instead of 55W) because of the spare wattage to power the adapter with.
     
  17. zhenya macrumors 603

    zhenya

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    #17
    Yeah, I agree, it's probably reserving 5W for use, but not always using that amount. The value reported by Coconut Battery with it plugged in is consistent regardless of load.
     

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