Barry
You might be on to something
Another dpdt contactor with 110v coil
N.O. contacts Xantrex terminals are connected at the solar controller input
N.C. contacts Xantrex terminals are connected to battery
When on generator or Shore power the contacts close and the Xantrex is connected to solar controller input, solar controller outputs correct charging profile
When no 110vac is available (normal situation) ,
The Xantrex is connected to the battery and operating in inverter mode
This contactor activation coil wires to the 110v terminals coming from the safety cutout over voltage contactor powering the Xantrex
So no 110v is default inverter mode connection
110v available is charge controller mode connection
It's a work around kludge , but it should do the job
I would set the voltage to something less than nominal solar input
In charge mode the Xantrex will be paralleled to solar panels, they are solid state devices a higher voltage can produce a current flow thru the solar panels
Consider a second duplicate solar controller to use with the Xantrex connected to the battery, the Xantrex will be it's solar power,
It's only duty will be to control the Xantrex input when 110v is available
I can explain it to you.
But I Can Not understand it for you !
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