One question / observation...
I understand the voltage drop limitation between the SSC and the hub. One thing I'm fuzzy on is if the passive hub could be used to extend that length. A real world example is that I have a fairly tall two-story house. Murphy's law states that I will have an SSC at the very peak of the very top of my roof, and getting a cable to it is probably a 50' endeavor from the ground. Could I take this wonderous little passive hub, run perhaps 50 feet of data (cat 5) and 50 feet of dedicated SPT2 power feed to the passive hub, and place that passive hub is some water-protected enclosure at my gutters. Then, could I run another 20 feet one direction to my 128 node string and and another 50 feet in a different direction to my second 128 node string high along the roof line. My total run is then 70 feet and 100 feet respectively from the main hub in the yard.
Does that make sense? I was doing the math of the voltage drop, and I agree that 128 nodes, I don't know how much over 50 feet you want to push that power given the current consumption of the 128 node strings.