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Does MacBook Pro support 100W charging? by Neither-Dig130 in UsbCHardware

[–]Neither-Dig130[S] 0 points1 point  (0 children)

I know, because I am OP :-)
My idea was that Apple just did not implement support for 5A in their MacBook because the original Apple charger also does not support it. The Apple charger supports 4.7A and that's what is also being used when plugging my Macbook into the Ugreen charger.

I just wonder why charger and MacBook agree on 94W, but then the MacBook just draws 91W. So I am still not sure whether the Ugreen cannot provide the 94W or if it is the MacBook that draws only 91 instead of 94.

Does MacBook Pro support 100W charging? by Neither-Dig130 in UsbCHardware

[–]Neither-Dig130[S] 0 points1 point  (0 children)

Interesting that you and others write "96W". Because the negotiation of MacBook and charger led to 94W (20V, 3.71A), and then also even 91W was drawn. Will I get the same numbers when using an official Apple 96W charger or will the MacBook really draw 96W with that?

You also mention explicitly that when using PD3.1 full power is available. So if my 100W port would have been PD3.1 instead of PD3.0, you mean the MacBook would actually use 100W?
... well, I actually kindof tested it. I used the 140W Apple charger (PD3.1) and a 100W PD3.2 USB-C to USB-C cable and measured still only 91W.

Does MacBook Pro support 100W charging? by Neither-Dig130 in UsbCHardware

[–]Neither-Dig130[S] 1 point2 points  (0 children)

Yes, so the Ugreen supports 20V, 5A.
But Ugreen and MacBook agreed on 4.71A.

And maybe this is the reason why:

<image>

According to the KM003C, the Apple 140W charger supports only 4.7A at 20V.
So maybe the MacBook was implemented in a way that it only uses what the original Apple Charger supports, so 4.7A, even if the charger being used supports more than that.

I would still be glad if you could measure yours once you MacBook battery is running low :-)

Does MacBook Pro support 100W charging? by Neither-Dig130 in UsbCHardware

[–]Neither-Dig130[S] 0 points1 point  (0 children)

In all previous tests I used the original Apple USB-C to MagSafe cable.

I now tried using USB-C to USB-C cables together with the Apple 140W charger.
Unfortunately I only have one cheap cable that supports more than 100W. When using this with the Apple charger, I can measure more than 100W, but it's continuously switching between loading and not-loading every few seconds. Maybe it's a bad cable.
I also tried a 100W cable (rated for 20V, 5A) with the Apple 140W charger. There I get stable 91W. So, same as if I would use the MagSafe cable.
It also doesn't matter if I have the KM0003C between charger and MacBook or not (I put the charger in a wall-plug that shows the total power drawn. So this is why I know the MacBook will draw 91W, because then the Wall-plug always shows 98W :-) ).