xantrex freedom EX 4000 install 2 for 220v instalation to breaker panel for whole house?

Picked up these inverters trying to install,called xantrex and the technical guy didnt really seem to know much,Do I need to have the usb profram to enable split phase 220v operation?The chassy ground does it go to the pipes that my panel ground are grounded?My panel is bonded and I want to use it on a small hottub(125 gallons but 220 operation)also using buss ANL fuses with a 60 KWH lithium battery bank,The inverter is supossed to have a 50 amp transfer switch how do I make that work?Would like to be able to switch back and forth form grid to solar although rarely need to run grid power,would like to use the charge capablities with an external generator?Also size of wire for chassy ground?thanks