Even so, it’s not obvious if that 15W goes to every occupied port or is shared between two ports. When all three ports are occupied, the very best two supply 15W (all over again, whether individually or combined is unclear), with the bottom port outputting 45W of power. WARRANTY: https://damiencqagp.onzeblog.com/17134918/detailed-notes-on-macbook-power-adapter-charger