It is the amount of power they can deliver to the laptop. Despite that, there is still a major difference between the 60W and 85W Macbook charger. The two chargers will both be able to charge your Macbook so you should not worry about choosing the wrong one. The USB Power Delivery (PD) specification enables power delivery up to 100W but how much power exactly is provided depends on the device.If you are looking for a replacement Macbook charger, you may be facing the dilemma of choosing between the 60W Macbook charger and the 85W Macbook charger. 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. Currently, depending on the model, we provide products with 15W, 27W, 60W and 85W. It depends on the computer, the peripherals and what you are doing with it. 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. For more details, see the diagrams below and check out our test results when recharging a MacBook Pro. 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. In the scenario above with three bus-powered devices connected to the computer, 60W is insufficient.įor 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). However, if you are using a product like our Thunder3 Dock Pro and connect one bus-powered Thunderbolt 3 device to the second Thunderbolt 3 port on the docking station, use the built-in USB ports for the USB drive and do not connect any bus-powered devices directly to the computer, 60W as provided by the docking station is enough to power the computer.

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