Anybody with experience installing an ungrounded inverter in the USA? I have a home-owner with an existing array from 2004 that needs a new inverter. I would like the POWER ONE PVI-3.0 (aka Aurora). It utilizes some sort of "sophisticated detection circuit" to identify a ground fault, and then shut down operation . It does require an ungrounded array however. My understanding is that PV Wire is a must and that is not a possibility (existing array). I also believe all conduit needs grounding bushings (not sure???) Is this realistic given code req.s?