Can TB16 with 240w supply enough power to XPS15 9550？

Hi cvn21,

You will need the 240W adapter to supply enough power. Please see here:

www.dell.com/.../dell-thunderbolt-dock--tb16--information-and-specifications

Thanks

Thanks for your answer to me.

But, I still want to know why 180w adapter can't supply enough power to my laptop.

Charging laptop use 130w, there still have 50watt remain to drive dock itself.

"But, I still want to know why 180w adapter can't supply enough power to my laptop."

The power consumption of the XPS 15-9550 hardware components requires the 240w which is why the Compatibility Matrix for the TB16 states this.

@CVN21, the dock needs power to supply to the attached PC, run its own internal electronics, AND power any peripherals you might attach to its USB ports or its upstream Thunderbolt/USB-C connector located on the back of the dock.  The TB16's manual doesn't seem to give exact specs for the maximum power available on those ports, but the USB 2.0 ports could be anywhere from 2.5 - 7.5 W each, the USB 3.0 ports could be anywhere from 4.5 - 7.5 W each (or up to 12W if they could supply more current when they're not also being used for data), and that Thunderbolt port could be anywhere from 7.5 - 60W.  If you only had a 180W adapter coming into the dock and you wanted 130W available to the attached system, there isn't enough capacity left over to power all of the other peripherals you might attach simultaneously, which is why you need a 240W adapter if you want 130W available to the system.  Maybe something between 180W and 240W would have worked, but Dell has been making 180W and 240W adapters for other systems for years now, so I'm sure they just stuck with the models they already had available for manufacturing simplicity (and deployment simplicity in larger organizations that stock replacement parts on-site).