So you will probably need some kind of battery. I don't know of any way to hook panels directly to an inverter. I don't think the panels would handle the start up surge. But you could use this
Relay Driver - Morningstar Corporation it's basically a programable set of relays run by battery voltage. I believe it has times you can set.
So say your batteries go into float for 10 min and you have the relay driver set to kick on the relay to give power to the inverter. But if the in goes away for 10 min you can set the timer on the relay to wait for 20 min before it kicks back off because of low battery voltage.
I don't think that makes sense at all but there is a guy on YouTube that shows how it works. (Sorry I can't find the video) I actually have one but I haven't hooked it up yet. It essentially acts as a smart dump load controller