Power Recommendations Please!

Powering up all of your whisker tracks at once could up all of the Z4K's 10A output.  Powering one or two locos at a time on the turntable should be well within the Z4K's capacity even with a train running on the loop.  At shows without a dedicated yard transformer, I draw turntable power from one of the loops.  No problem with amp draw.  However, this photo session of a dozen locos idling on the whisker tracks used almost 10A.

Well the issue with that idea for me is I use the MTH star wiring system and I have all of my whisker tracks and turntable lead on the same block.  Basically my wiring system is I have Outer Loop on one wiring block, Inner Loop on another wiring block, and the Turntable and Whisker Tracks and Lead on another wiring block (the wiring blocks in which you plug in the banana plugs from the TIU) 

You can power two TIU inputs from one Z4k channel and route one output to the loop and the other to the yard block.  YMMV with the DCS signal in complex track areas and a separate TIU channel driving the yard may provide the best signal.

The primary reason for a separate power source for the yard is to keep a short while messing with locos in the yard area from stopping operations on the loops.  If all of your locos are command controlled, then a 180W brick can be used.  Don't worry about 18v vs 21v as everything will run fine on 18v.

Thanks Tracker John!