I have seen in press releases that there is no limit to the number of IQ8 microinverters on the roof relative to the battery size. I can't remember if I saw this in Enphase marketing or directly in the documentation. But in reality, there is a limit. It's 64A of inverter output current since the Smart Controller only accepts an 80A PV breaker. This is a limitation of the rapid shutdown functionality.
With IQ7 there is a 1.5x limit for PV to the battery inverter output rating. However, you can actually install 96A of inverter output. You can have up to 64A on the PV breaker and up to 32A on the load side of the smart controller (or any combination up to 96A inverter output rating as long as the PV breaker component does not exceed 80A). Am I missing something here? It seems like the IQ8 is very limiting if you need a lot of PV paired with a maxed-out battery system. That's a strong reason to use IQ7 over IQ8 in some scenarios. Jason Szumlanski Florida Solar Design Group
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