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Topic

What Combiner Box with AC Disconnect do you recommend for Enphase branch lines?

What AC Combiner Box with AC Disconnect do you recommend for up to 12 incoming Enphase branch lines?

Comments

An Enphase inverter circuit is a string of AC sources ranging from .8A at 240VAC to about 12A (From 1 to 15 M190s). 12A of M190s would require a 15A breaker for protection.

So, a combiner box for Enphase inverters is really an AC subpanel. Any adequate subpanel would work - for your 12 "string" (circuit) system, at 12A each, you'd need 12, 2-pole 15A breakers.

Also keep in mind the NEC requirement under 690.64(B)(2) is that the sum of the circuits feeding a panel cannot exceed 120% of the bus bar rating.

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Enphase_Wiring_Diagram_1_240_Single_Phase.pdf 131.79 KB