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This is the simple solution to automatically switching power to shore or gen. when the inverter is not on that came standard in Heart inverters that were made as far back as 85.
Attachment 2239
Attachment 2238
I had to replace the one on ours.
I'm with you on this one Jim.
I have yet to hear an explanation that sufficiently gives good reason why this did not remain a standard feature.
The information Lee provided relative to how things work is correct.
Not to belabor the issue but to elaborate to help explain things here is how the electric flow path works.
Shore power goes through the transfer switch to the panel. The transfer switch is prioritized. It passes (in the order listed) power to the panel. First inverter, then shore, and finally generator power. With shore power at the panel the two inverter switches in the panel send shore power to the inverters. The inverter switches in the Liberty AC panel on my vintage coach are 50 amp, and they each have two 10 gauge stranded wire sets going into the inverter. One set is connected to the inverter AC input which when hot will transfer to the AC output, and the second set is connected to the inverter battery charging circuit input wires.
Once the inverters see incoming power their internal transfer switch closes the circuit sending the shore power back to the red marked circuits and to the battery charger section of the inverters.
The inverters, in the presence of shore power will not use battery power to supply any AC power requirements.
If the inverter switches in the AC panel are in the off position the red marked circuits will not get any AC power from any source, inverter, shore or generator. A by-pass switch is required to enable that which is why I made the modification to my coach.
This is good information and all converters are not the same as Jon previously pointed out. My 97 Marathon functioned the same way as Jon just explained, if you lost an inverter, you had no A/C power for that particular leg. I was going to install a bypass switch, but sold the bus.
My CC is different. You can shut off both inverters and it has no effect on shore or gen power.