Many utilities require an AC disconnect between a grid-tie inverter and the AC load center, close to the AC service entrance, with a visible and lockable handle. A 30-amp 240-volt disconnect is good for up to 7.2kW and the 60-amp disconnect is good for up to 14.4kW.
For connection of multiple inverters to one of these disconnects, use an AC load center, with a circuit breaker for each inverter installed, as an AC combiner box between the inverters and the disconnect switch. The breakers in the load center can be back-fed with the inverter outputs and the load center main lugs will handle the combined outputs to be connected to the AC disconnect.
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