u/ThinkSharp

I’m looking for options that use a single point battery backup system to back up my house. House has a 400a meter with 2x 200a panels, and 19.4 kW of IQ8M Enphase solar, currently line tap grid tied in Panel A.

Everything I’ve been able to find wants to route grid power THROUGH the device to the panel. The Sol-Arc 18K seems great, integrating solar, battery, and generator charging but it won’t seem to let me install it “on the side” through a backfeed breaker (and I’d expect to be able to do that using a generic automatic service disconnect and voltage sensing interlocks on the inverter).

I currently manually backfeed with a portable generator run to a junction box, parallel fed to manually interlocked breakers in the panels. I want to “upgrade and automate” this kind of thing.

Am I wrong about that unit can be installed? Is there a solution out there I haven’t found?

TL;DR, I want a to keep both panels fully backed up, but use a standard backup system parallel feeding each panel.

See edit at the end.

I just need someone to let me know if I’m misunderstanding, or if I have it right. I currently have: utility meter (400a)- parallel feed to 2x 200a panels. Solar (WnPhase IQ8M based) is line-tied in panel A before the master breaker.

If I want to add battery backup I need automatic transfer. EnPhase does this with their System Controller 3G (for additional generator connection) and IQ Combiner 6C (current tech).

But I cannot, for the life of me, figure out how to integrate this into a split phase service without duplicating at least the System Controller; one ahead of each 200A panel.

Edit: I might be asking the wrong question. The right question might be- what companies make units hybrid backup that permit 320 A pass through of the utility line with 200A or less rating for the backup combo?

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