XPS13 / TB15 Charging

I purchased the XPS13 / TB15 (180W) for the docking capability / replacement of my desktop.  My configuration is the TB15 connected to 2 monitors, Ethernet, lighted keyboard, mouse, and speakers.

Having read many of the problems experienced with the TB15, I did the step-by-step driver installation prior to connecting the TB15.  The installation worked almost perfectly.  I did have a problem with the second monitor being identified, but a simple reconnect of the Display Port cable solved that problem.

My current problem with this configuration is that my XPS13's battery drains when connected.  It shows that it is plugged in, but the battery power still drains.  I thought perhaps this might have been that I have a 180W verses the 240W power adapter.  Thinking that there might be too much drain from the peripherals, I purchased an external USB 3.0 powered hub, but this did not help.  I still need to connect the regular power adapter to keep the XPS13 working.

My question is on the power adapter for the TB15.  Would the 240W adapted allow the XPS13 to charge when connected to the TB15?  After reading a Dell Linux forum, the TB connector has limited current, so the 180W/240W only make a difference with the connected peripherals, e.g. external hard drives.  

Perhaps I am missing a Bios configuration to allow charging or some other software configuration.  Does anyone else have this problem?