XPS 15 9500 with Anker PowerPort Atom III (60W)

If the link below is what you have, you'll see though it's rated at 60W total, the USB C port is indeed 45 W, so the system is reading it correctly.  The other 15W is for the USB A port on the adapter.

https://www.anker.com/products/variant/powerport-atom-iii-2-ports/A2322121

@jacobacci  As mentioned above, you're looking at the total power output spec of the power source, not the per-port power output.  Not all chargers that support a given amount of power output support providing it all out of a single port, even if the other is unused.  This is especially true in cases where USB-C and USB-A ports are mixed on the same device.  But honestly even a 60W power source for an XPS 15 is going to result in pretty slow battery charging and likely poor CPU and GPU performance given that the system is designed for more than twice that amount of power (130W, unless you have an XPS 15 9500 that does NOT have an NVIDIA GPU, in which case it's designed for 90W).  And until recently, you'd have been stuck anyway since Dell has been limiting USB-C power draw from any non-Dell sources to 65W, even if the power source could provide more and the system would benefit from more.  But I've seen reports from XPS 15 9500 owners that the system will draw at least 90W from certain sources.  I personally have this charger, which offers 90W total output but can split that in a variety of ways between its two ports: 90/0, 60/30, and 45/45.  If you really need a USB-A port, then consider just getting a male USB-C to female USB-A adapter dongle.  Having that second USB-C port will likely prove more useful to you anyway, and when you're not using that port, being able to give your system 90W vs. 60W should help quite a bit with the battery charging and performance aspects.

In terms of your other systems, the XPS 13 is designed for a 45W source, so it would be perfectly happy with your Atom III, and the T480s is designed for a 65W source but will evidently accept a 45W source without complaining.  But providing only 45W to a system designed for 90W or even 130W is another story.

I'm a big fan of Anker products myself, but you simply have the wrong one for your purposes.  And unfortunately they don't seem to offer solid high-wattage USB-C chargers yet except the PowerPort Atom PD 4, which only offers 100W total output and despite that is huge, much larger than the 90W RAVPower charger I linked above.

Thanks to both of you. Your answers clarified the issue totally. I had completely missed that the Anker splits the 60W between the PD and the USB A ports. 45W is indeed not enough for the XPS 15, although mine is an i5 model with intel graphics. So the rated power would have to be 90 Watt.

I am not looking to do any power hungry stuff while on the road. I will mostly be working on battery and then recharge overnight. 

I'll take a look at the RAV Power unit. It looks really good.

Thanks again.

I have ordered a RAVPower 90W. Can't wait to get my hands on it.

@jacobacci  Congrats!  I've had mine for a while now and haven't had any problem with it across multiple systems/devices.  It replaced an older Nekteck 90W adapter that was much larger, had a captive cable (wasn't a fan, but there weren't many 90W options back then), and also triggered random device disconnect/reconnect sounds on my systems occasionally.  The charging indicator never went away, but something seemed wonky about that.  Haven't had any issues like that with the RAVPower unit, and I definitely like that it's smaller and allows you to plug in whatever cable you want.  Enjoy!

The Anker is now doing duty in the travel set for my XPS 13 9350, so all is well