Solar AC Disconnect - Fused or UnFused?
You don't need a fuse here

The solar disconnect is only needed so the utility can shut down your solar system if it goes awry without having to fumble around in your breaker box or incur the risks of pulling your meter "hot".  As a result, a non-fused disconnect is A-OK here, as the breaker in the panel + the inherent limits of the solar source will protect the wiring from short-circuit or overcurrent.