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My SOB with a residential refer is wired similar.
It is a 15a breaker. In my case the entertainment circuit lives on the same breaker. The way it's wired is that there is a splice prior to the inverter. The entertainment circuit stays powered all the time.
The other side of the splice goes to the inverter that has a built in transfer switch. The transfer switch determines if there is shore power. If so, it passes the 110v straight through to the refer. If not, it takes the 12v from the batteries, inverts it to 110v and powers the refer.
In my case, there is only the single outlet that sits behind the inverter.
Hope that helps.
Ken
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