Enphase microinverters ac coupled to 3 x multiplus ii in parallel

Have a separate pv string with enphase S270 microinverters on a grid tied system and would like to remove from th grid and add to my off grid system , 3 x 48/5000/70 multiplus II in parallel with a 450/200 charger + cerbo gx. Would I wire to the AC input ? And what be the configuration settings procedure ?

Need some help and guidance

Cheers all