I've done a lot of the battery operated, but not wired Triathalon. Can you use standard 18/2? Or stick with Lutron wire?

Also, with heavier gauge wire, are comfortable going over the 125 ft spec?

You can use regular 2 conductor speaker wire (it's just power... not communications).  The wire size depends on distance and power draw units (PDUs).

In general, 18AWG will work for short runs under 50ft), 16AWG will work for most runs, and 14-12AWG can be required for really long runs.

There's a chart for Sivoia QS shades which describes the wiring requirments:
[Link: lutron.com]

There might be a similar document for Triathlon, but I haven's seen it.

As long as there truly is no kind of data going over the line, a longer run of larger wire should work. Of course the company won't guarantee that.

Still, I'd figure out possible longer thicker run possibilities, then ask about it with the most techie of the manufacturer's guys you can get on the phone. Don't call with an open-ended question; instead do some calculations and then ask for confirmation. Expect a wishy-washy response, though.

Thanks!

We run 16/4 speaker wire to the majority of our shades. Three reasons:
-Extra conductors if something is damaged
-Extra conductors if you have to relocate the wireless dongle
-Wire size is typically good up to 200'. Any more than that, you probably have a transformer located in a different wiring closet.