you have to have 3 phase and Neutral for incoming power and you get 3 phase and Neutral out from the inverters. If you want full 3 phase control then you need 3 x multi/Quattro inverters. you can connect PV to a single phase, but the outputs from the pv would only go to that one phase's electrical loads. There are a few diferant ways to do this

The function of neutral wire in 3 phase 4 wire system is to serve as a return wire for general domestic supply system. The neutral is paired to each of the single phase load. The potential of the neutral point can be very well understood from the following Figure. In the above diagram, the alternator is connected to the load by three phase four
Currently, I am using a 400V to 12V transformer in reverse, meaning I supply 12V and around 1.5 A to the secondary side of the transformator and try to get 400V output voltage. My problem is, when I connect anything to the primary side, my voltage breaks down, meaning I only get around 2V of input voltage and 60V of output voltage.
Subscribe to my channel: http://bit.ly/2rYtS79I'm no way an expert at electronics. I wanted to upload the video because I thought the video might be helpful
The output voltage of an inverter is directly proportional to the input voltage. If the input voltage increases, the output voltage will also increase, and if the input voltage decreases, the output voltage will also decrease. The impact of output voltage on device performance is significant.
If it is rated at above 80% efficiency this may be at the 230V range with efficiency dropping to 71% at the lower end of the range. Or you may have measured the value incorrectly. Whether DC or AC, instantaneous power is instantaneous voltage x instantanous current. yJB9gf.
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    • how to get 400v from 230v