There is a 5 ton heat pump that requires 240VAC with a 150A circuit breaker. If we can get to 200A service panel, then we can add a 40A breaker for the water heater. I'm not sure of piggy backing the outputs of the inverters to the main input lugs of the main panel.
Use a bus bar?
When you are talking about a system of this size, I would highly recommend that you discuss this with someone trained and experienced in a system this large.
The cost of a mistake could far outweigh the price of an expert now.
