Say what you want but I believe most inverters still "want" a neutral connection. See this thread:Why is it needed? Well, there were some 3 phase inverters in the past that used it as a load-carrying conductor. I remember one 3 phase inverter that was connected in a WYE configuration and would turn on the phase inverters separately to match the inverter load to the PV array output. I don't know of any inverters today that do that, maybe some large central inverters still do it. That's the only load carrying situation I have seen, the other uses have to do with voltage detection. If you want to detect loss of phase voltage you have to be able to measure the line to neutral voltage. There used to be a couple of inverters that would allow a 3 wire and EGC connection as long as it was to a grounded WYE system. They just used the EGC as a substitute for the neutral and did the phase voltage measurement from line to EGC.
Now, connection to an ungrounded delta service is pretty new for most inverters. No neutral is needed there, no loss of phase detection, just monitoring the L-L voltages.
Near the top of my list of frustrations with the PV industry is the Inverter neutral conductor (note for the purpose of this I am referring to mid to large size PV systems using 480V string inverters). I do have a bit of good news I would share in case any of y'all were not aware. Please help...
Granted it is 4 years old, but I doubt much has changed. Bottom line is most inverters STILL require/recommend/suggest a neutral connection when it doesn't seem to be absolutely required.