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Did you look at transistor Rdson and related voltage drops? You will get 4% power losses only by Rdson.Yes with 48V the current is 208Amps but the MOSFET IRF150 is capable of handling 40Amps so I am using 6pieces (6X40= 240Amps) at either side making it a total of 12pieces.
You get out what you put in the simulation. Besides said Rdson losses, transformer windings resistance and leakage inductance will cause output voltage to decrease. Most likely, battery voltage drop will be considerable too.During my simulation i figured out that the output voltage decreased when I connected some loads.
The inverter has to be designed to gived full output voltage at rated power. At lower load, the effective output voltage can be down-regulated, e.g. by reducing the pulse-width of square wave or "modfied sine" inverter.