About Question 33, if the building has less than 1000amp service, can we do the load side connection on subpanel?
The answer is no, because the subpanel is on the supply side of the of the 1000A ground fault breaker.
In the NEC it says:
705.32 Ground Fault Protection: Where ground fault protection is used, the output of an interactive system shall be connected to the supply side of the ground fault protection.
One of the reasons is that if there were a ground fault on the supply side of the main breaker, the fault current could go to the inverter rather than tripping the ground fault breaker.