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You could use something like an Iota ITS 30R Transfer Switch or
The AC inverter output would go into the switch then to your panel, you would run the AC power that comes from the main panel to the switch so it can auto switch from your battery to house power.
there are a few videos on youtube like this one
hope this helps
try this site
$58 + about $17 shipping to my location in California
Just bought one myself for $78 total
slowly building my solar design..