Answering the question, for the archives: Google "AI" found me a phone number 219-734-5500 which got me to a live Fronius tech support person in well less than a minute. This number doesn't appear to be on their website. Tech support definitively answered that no neutral is required and that is perfectly fine to configure the inverter for "delta" when connected to wye without a neutral present. She said there is no downside to it. She did say that a neutral is required for the 480 volt Symo inverters.
Electrically this all is as I expected. This saves well over a thousand dollars of conduit and conductor. -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 http://www.aprsworld.com/ On Tue, Nov 5, 2024 at 8:47 AM James Jarvis <j...@aprsworld.com> wrote: > Hi Group, > > We have an install with four Fronius Symo 10.0-3 inverters connected to a > 208V WYE building hundreds of feet away. While the building has a neutral, > I would like to avoid sending the neutral out to the inverters as it is a > waste of materials. More wire, bigger conduit, neutral kits in disconnects, > etc. > > The Symo manual indicates that there is a wye grid configuration with > three phase and a neutral. And there is a delta configuration with three > phase only. Both appear as though they can be set to 208V > > > > I can't see any reason why I can't program the inverters at Delta and not > have a neutral. Am I missing anything? I tried inquiring with Fronius, but > it's a process and the conduit has to go into the ground today. > > Thanks wrenches! > > > -James Jefferson Jarvis > APRS World, LLC > +1-507-454-2727 > http://www.aprsworld.com/ >
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