So just checking "for a friend" here - can you not do 3 x single phase inverters on a 3 phase system then?
I ask because I've seen that done a lot of times, and that has lead us to have disputes about what the ACTUAL feedback is:
Worked example:
Red Phase - importing 1kW
White Phase - importing 2kW
Blue Phase - exporting 1.5kW
For 1 hour...
I have an Itron prepaid meter and a solar logger that shows me that the above system IMPORTED 1.5kWh , exported 0.
But I have another meter that shows me the system IMPORTED 3kWh AND EXPORTED 1.5kWh
Which is right and which have you guys seen more of?
This link explains it pretty well (do you add up the phases or not before calculating import/export) - apologies that it is an Aussie link - we're talking South Africa here
https://reneweconomy.com.au/3-phase-trickery-utilities-ripping-off-solar-households-17282/