Hmm. In that case, do we know the longest USB cable length that’ll work with a grid? Further up in the thread someone stated that they’re using a 5m cable, which is about half the distance I was trying for…
UPDATE: @Jonny, @zebra Today I received a 20-foot USB cable and can confirm that it works. So the max length seems to be between 20-30 feet.
Tomorrow I’ll receive a USB Y-splitter cable for powering the grid externally and will see (after clipping the red wire on the data leg) how that works with the original 30-foot cable. Progress!
UPDATE 2: I modded the Y-splitter cable and confirmed it works with the 20 ft cable, but it doesn’t work with the 30 ft cable. Put another way: the 20 ft cable works with or without the modified Y-splitter cable, and the 30 ft Amazon Basics cable (which, incidentally, is noticeably lower build quality) doesn’t work at all. I then tackled it from the other end, and found a longer (6 ft) USB A to mini-B cable than the 3 ft one that came with my grid, and that also works with the 20 ft extender cable unaided by the Y-cable. So I can confirm 26 ft anyway.