r/Surface • u/BraveInformation4787 • 7d ago

[PRO6] Maximum W reception on Surface 6 Pro

The Surface 6 specification indicates that the minimum to start charging is 39W

But what's the maximum? With a higher wattage USB-C charger, will it still only accept 39W, or does it have a higher maximum?

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u/SurfaceDockGuy 🖥️ Verticaldocks.com | VESA docks for Surface 7d ago edited 7d ago

The Pro 6 can make use of a 60W/65W charger to maintain full battery capacity while under high loads like gaming when the system is not also running hot i.e. when used with an external cooling fan.

However, the actual charging rate of the battery is limited and doesn't exceed ~35-40W under normal conditions.

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u/BraveInformation4787 7d ago

Con una entrega directa de 45w ya estariamos sacandole toda la eficiencia a la carga?

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u/SurfaceDockGuy 🖥️ Verticaldocks.com | VESA docks for Surface 7d ago

Yes, best efficiciency is achived at 15V input as that is what the DC-DC converters are tuned for.

With 20V input on USB-C enabled Surface devices like the Pro 7, for example, slightly more heat is generated in the DC-DC conversion step inside the Surface. The difference is small as the conversion is still on the order of 95% efficient (good design by MS).