You may want to give Apple a call to get something in writing on what the limits are for your system. As it's so new I don't think anyone has tried charging via someone else's charger system.
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What I can tell you is this write up: [https://www.cnet.com/how-to/usb-type-c-thunderbolt-3-one-cable-to-connect-them-all/|USB Type-C and Thunderbolt 3: One port to connect them all] gets into some of the specs. Here it stated 20 volts & 5 Amps being the limit of output. So if we think of the Mac as a end device it's input can't be higher than that.
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What I can tell you is this write up: [https://www.cnet.com/how-to/usb-type-c-thunderbolt-3-one-cable-to-connect-them-all/|USB Type-C and Thunderbolt 3: One port to connect them all] gets into some of the specs. Here it stated 20 volts & 5 Amps (100 Watts) being the limit of output. So if we think of the Mac as a end device it's input can't be higher than that.
You may want to give Apple a call to get something in writing on what the limits are for your system. As it's so new I don't think anyone has tried charging via someone else's charger system.
What I can tell you is this write up: [https://www.cnet.com/how-to/usb-type-c-thunderbolt-3-one-cable-to-connect-them-all/|USB Type-C and Thunderbolt 3: One port to connect them all] gets into some of the specs. Here it stated 20 volts & 5 Amps being the limit of output. So if we think of the Mac as a end device it's input can't be higher than that.