Inverter and battery sizing to power my camper microwave

You folks are very helpful, thanks. I do get it about wiring and will plan to discard what comes with an inverter and oversize the cabling.

So you can run your air conditioner for over an hour? Wow. I don't plan on using the AC at all and we don't use the microwave much at all, so if this system plan can do that, wife will be happy.

But how do I find out about the inrush current matter? That's a bit concerning to me. I want to do all of this once only and get it right the first time.