Connecting gen to multi/input current?

I’m setting up a Hyundai DHY6000SE-LT800 Diesel Generator, continuous kva is 5.6.
To attach to my easy solar 48/3000.
I’m looking placing it about 30m from the easysolar/multi, via an armoured cable, coming from the generators 32a outlet straight in to the input on the multi.
Any advise on cable thickness, 6mm?
Also, what input current should I set on the multi.
I’d like to utilise 5.6kva off the generator, clearly to charge the batteries faster/using less diesel.
Is this possible……?
Many thanks
Ian