AC combiner and home run

Bobgar said:

I am in the last phase of my grid connected micro inverter install. I have all the trunk line combined in a breaker box. My question for anyone who may know, do i need a neutral line going to the disconnect and then to the main panel? Right now I have L1, L2, a ground, and a neutral wire. But each of the trunk lines only has 3 conductors. so I'm not sure exactly why I would need a fourth wire. unless the combiner counts as a sub panel by code?

Thanks to whom ever takes the time to read this!

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zanydroid said:

Code allows you to have 240V only panels.

If you want the option to tap that combiner panel as a subpanel, then neutral makes it a lot easier. Especially since code forces you to install a lot of fancy breakers now that require neutral, even for 240V only loads.

Other use cases: I think Enphase combiner needs neutral. If you add things like Emporia / other energy monitors, they usually need neutral.

Overall, I really don't like 240V only panels.

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