Chris Lewis wrote:

....
40A at 240V is 9600W. That's a honking big inverter. You could
just about buy a new car for how much one of those costs.
....

And a honkin' big pump as well as I noted elsewhere. The actual pump is
unlikely to be 2 hp if this is just a residential well. I don't have
a clue as to why it would be on a 40A circuit unless there's another
branch circuit feeding the pump itself or it is, in fact, a much larger
well.