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dfb,
Typically, an inverter used to power a residential refer will have both 110v input and a 12v input. The built in transfer switch will first look to see if 110v ac is present. If so, it will pass the 110v on to the refer. If not, it summons its power from the 12v batteries, inverts it to 110v ac and sends it along to the refer.
The transfer switch automates the process.
Hope that helps,
Ken
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