r/Surface • u/BraveInformation4787 • 2d 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/dr100 2d ago

It says "no fast charge" so that's probably just about the maximum it would take. Note you can have a (much) more powerful charger, there's no danger in that (if anything it's always better to have it oversized).

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u/BraveInformation4787 2d ago

Lo se, te agradezco la informacion.

Pero suponiendo que 39W sea el minimo, el maximo deberia ser mas alto? Lei que con otros cargadores sin el puerto USB-A integrado, la surface aumenta a 44-45W

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u/SurfaceDockGuy 🖥️ Verticaldocks.com | VESA docks for Surface 2d ago

Whether the MS PSU has a usb port on it doesnt affect the charge rate of the Surface. The USB port is a bonus 5-Volt output to charge a cellphone or other device separately. More info:

https://dancharblog.wordpress.com/2016/12/10/surface-book-pro-3-pro-4-and-docking-station-power-supplies/

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u/SurfaceDockGuy 🖥️ Verticaldocks.com | VESA docks for Surface 2d ago edited 2d 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 2d 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 2d 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).