Ozz, now that I've looked up the Magnum and realize that you have a dual purpose unit, everything makes sense.
I'm not sure why you're cascading relays, though. Don't you want to kill the ac input to the inverter when an ac output from the inverter is detected, just like flipping the breaker? Seems like if you don't break that line, then the inverter is still going to toggle.
Bob
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