New here, just purchased a late model used Bobcat 225g with a14-50r 220v 4 wire receptacle. What exactly does a full kva plug kit do? Connect neutral to ground? Why does this make for "full kva"?

Want to back feed house breaker box thru a 50 amp DP breaker using an interlock to make sure main breaker is off first. Neutral and ground from the generator connected to the house "ufer" and ground rods, I think. What is this generator going to think of unbalanced 120v loads, which I will try to minimize,
originating in the breaker box? Thanks