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The 120v outlets are either powered directly thru the Main Panel, via the ATS(auto transfer switch) by Shore power, or Generator power...
or, some of the outlets, including the residential 120v Fridge, 'may' also be powered thru the INVERTER, If you have a whole house inverter wiring scheme, via a sub-panel in your Main Panel... and these same outlets, if so, are powered the same way the others are when you are on shore or gen via the Inverter's 'pass thru' relay, giving them power regardless of 'where' it comes from.
If you have a dedicated Inverter wiring scheme, meaning that the Inverter only powers the Fridge outlet, and maybe one or two others, such as for a TV, they might only be wired or plugged in directly to the Inverter. In this case, the outlet(s) are ONLY powered by the Inverter, and the Inverter would have to ALWAYS be ON for the outlets to receive power, EVEN if you are on Shore or Gen power, since there is no 'sub-panel' or 'pass thru relay'. The Inverter will continue to use your House battery bank for power, although it will also receive charging WHILE you are on Shore or Gen power(or solar, if you have any).
Many inverters have a setting that may allow you to control when the Inverter will 'drop out'(cut off, basically), if the outgoing Voltage is lower than a certain benchmark, such as 104 volts, to protect any possible issues with appliances or devices that use 120volts from the Inverter. This generally will only happen if the Inverter is either 'receiving' pass-thru 120v power from Shore or Gen, or it's own output falls to a lower range, because of potential lower battery output, of course, though that would be very rare since the Inverter itself will cut itself off at a point when it cannot reasonably output 120v nominal power.
I don't imagine, either, that your 'model' of coach has anything to do with why you may be 'seeing' low numbers that concern you - electrical wiring is electrical wiring, whether built in your Thor 35m or my Palazzo 33.3 or another Thor or other manufacturer's RV.
I don't think you have any problem.
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