3 phase 240v 200a design

[cm14]

:?:?:?
Hello All,
My grandfather has a 6kw system on his 1-story home.
We designed/build the system ourselves. We shopped around and found good panels, 2 good inverters, racking, the whole 9.
I used many online tools to design the single line diagram like string sizing tools and this forum of course. After 4 corrections we got the
project approved and build it in a week. MY grandpa now has his system and is very happy.
He has told his friends and now one of them wants me to design a system for him as well, problem is he has a 3 phase 240v 200a main and I have no clue how to tie into that. :?:?:?:?:?
He wants 3 power one inverters on this. Although I will probably convince him to hire an engineer, I am now curious as to how this works.
I've searched online and can't find anything so I came here where the solar pros are to look for answers.
How is this topology different than a regular one? and how would someone tie those 3 inverters into that weird main service panel.

Thank you all before hand.

 

[Dennis Alwon]

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