Even so, it’s not clear if that 15W goes to each occupied port or is shared between two ports. When all 3 ports are occupied, the best two supply 15W (all over again, whether or not separately or combined is unclear), with The underside port outputting 45W of power. https://goldenretrieverpuppieswes37059.tribunablog.com/indicators-on-macbook-air-charger-you-should-know-30576575