I install grid tied and off grid solar systems for a living. I don't know exactly what that inverter is but I don't like it.
A grid tie inverter that is UL listed (this one is not) won't sync to most generators. Good inverter generators yes, but others, no.
Grid tie inverters are typically designed to make maximum power and "shove" it into the grid. A generator is not designed to have something "shove" power into it. There are battery based inverters that have a function called gen. support; which is what you want. I don't know of any that use a 12v battery bank. They all run on 24v or 48v battery banks since this is standard in the home solar business that usually uses this equipment.
The Xantrex XW series is one model that will do this.
I wouldn't risk my gen. trying what you propose. I would also tend to shy away from electrical equipment that isn't UL listed.
