In the scenario above with three bus-powered devices connected to the computer, 60W is insufficient. For example, with the PSU connected to one of the ports (87W), two bus-powered Thunderbolt 3 devices (2 x 15W) and one bus-powered USB device (7.5W), that will leave about 50W for the computer (87W - 15W - 15W - 7.5W = ~50W). The 15" MBP comes with a 87W power supply, because it has four Thunderbolt 3 ports and needs to provide a lot of power in case all of the ports are occupied by bus-powered peripherals. For more details, see the diagrams below and check out our test results when recharging a MacBook Pro. In general, 27W is enough to maintain or slightly recharge the battery when the computer is not under load and 60W is enough to recharge the battery even when the computer is under moderate load. It depends on the computer, the peripherals and what you are doing with it. Currently, depending on the model, we provide products with 15W, 27W, 60W and 85W.
For self-powered Thunderbolt 3 devices with a second Thunderbolt 3 port, the minimum is 15W, which is enough to use a bus-powered device on the second port. The USB Power Delivery (PD) specification enables power delivery up to 100W but how much power exactly is provided depends on the device.
0 kommentar(er)
