converting a 5000 watt MSW 220vac 60Hz inverter to 220/110vac using a transformer

coverting 220v MSW 60 cycle 5000 watt converter to 110/220v split wave output
I bought the Generac 7kv propane generator which I have installed, it came with a transfer switch which is designed to switch from hydro to generator when 220/110vac plit phase hydro drops out.
I thought I maybe able to hook up my solar,wind,battery power system through a 24vdc to 220v ac modified sine wave 5000 watt inverter which I have already bought. but when I received it it only had 2 wire output not the 220/110 split phase output?? is has 4 universal plugs for the 220vac output (only 2 wires hooked up to them) but they are parallelled up from 4 diff. cct boards.
I am not familiar with the design but in the instructions it says it raises the 24vdc to 300vdc then converts this using advanced MOSFET transistors in a full bridge configuration. It also says its capable to start and run difficult reactive loads.
I am wondering if I bought a 220v to 220/110v split phase transformer and put that between the inverter and the transfer switch.
I do not want to buy a transformer which will cost me around 300$ plus shipping just to blow everything up??
Any body had any experience with this type problem I would appreciate any help I can get.
Regards Ron

You my want to read this article on MSW verses pure sine wave
Power inverter 5000 watts 24 volt 12 volt 5000 watt AC / DC power inverter 10,000 watt surge inverter 5000 WATT INVERTER 5000 WATT INVERTOR
Is this true or is he just pushing MSW inverters maybe an expert could tell us if there is one out there.
I would like to here your views.
Another question I have is can a large amperage battery charger be used to power the DC side of an inverter rather than a battery for test purposes??? The inverter intructions say to only use a battery.
Ron