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I have:

Basically I want to keep the USB-C port on the adapter free.

So, instead of using a USB-C cable to plug the charger to the adapter, I want to use the USB-A port on the adapter.

Will this work?

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    Possible duplicate of Can the 12-inch macbook charge from USB-A? – anothernode Oct 24 '17 at 7:14
  • @anothernode The other question doesn't include USB-C AV Multiport Adapter – aneuryzm Oct 24 '17 at 7:26
  • Okay, I see, it's surely not an obvious duplicate. To my understanding the accepted answer there still does answer your question.You are using a USB-A to USB-C cable in the chain, which will only allow for 5V current because it must follow the USB-A specification. So the answer applies: it might charge the MacBook very slowly but it's not advisable to try. – anothernode Oct 24 '17 at 7:41
  • @anothernode - There's no USB-A power delivery specification. There's USB 3.0 and 3.1 The type A port conforms to the 3.0 spec while the USB-C conforms to the 3.1. You can have a 3.1 type A port - they are very few and far between, but they can and do exist. – Allan Oct 26 '17 at 22:55
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No, this will not work. You cannot charge through the USB-A port.

The USB-A port is a 3.0 port which will supply 5V of power, but it will not be able to negotiate to receive power per the USB 3.1 spec.

Per the Multiport AV Adapter specifications:

Use the standard USB port to connect devices such as your flash drive or camera, or a USB cable for syncing and charging your iPhone, iPad or iPod. You can also connect a charging cable to the USB-C port to charge your Mac.

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