[Richard]

Check carefully the wiring to ensure what you think is accurate. Newell has done this several ways over the years. For a long time they provided a disconnect switch for the house batteries, BUT the inverter was wired direct. That could give you a nasty surprise if you didn’t know it, and thought you were shutting down the inverter by turning the switch off. They then moved to adding a separate switch from the inverter.

Why two switches. One of them will isolate the house batteries from the battery merge diode and the solenoid diode. One will turn off the inverter. There are some circumstances where you might want to do one or the other.

Don’t assume anything about the red wiring. One year I took the time to disconnect all the big red battery cables and ring them out. It was NOT as I thought it was.