Does anyone have experience of AC Coupled Solar systems. In other words, AC coupling is use of battery backup in a Grid tied inverter setup to provide power to Priority loads (Fans, lights, Router, Computers etc) in case of Power Outage from electric Grid. AC Coupling needs a separate smaller inverter to drive the priority load off the battery backup.
Some on-grid inverters have two AC outputs; one for normal load and second (lower capacity) for backup during power outage. You can search for them online.