Inverter RS 48/6000 smart solar

Hi everyone,i have a question about the above mentioned inverter,this inverter has one single AC-output,and in the manual i read that it can charge batteries from AC source? how exactly? can i tie this paralel with lets say the grid power? wouldnt it kill my inverter? or its designed in a way that i can do this?

This inverter is a 48/6000 rs solar smart,1 mppt 450/80,and 1 AC output.

You can connect ONLY an AC PV grid inverter to the AC output, because that will sync with the RS inverter’s output.
And then the Inverter RS, through its bidirectional DC/AC converter will charge the battery.

But all this is on the manual, at page 4, section 2.4.

Yes,i have read this,but i didnt know,that in this case the PV inverter will sync to mine,thinking maybe the rs syncs to the other one,therefore it could sync to the grid too.I didnt find this exact information,or at least slipped my attention,and also,its rarely talked about on the internet.I gues i would need to chnage this inverter to its sibling,that has the AC imput,and 2 mppts…Than i could set up for a conditional AC imput parameter,to have a pass through when i am out of solar,and battery power…sigh,was hoping maybe i can do this with mine.

Thank you for your response,its more clear now.