I believe he is referring to this:
If you leave the existing 12V charger in place then you have the 120V running off the inverter from the 12V batteries but the 12V charger running off the 120V is trying to charge the 12V batteries.
The simplest thing here is simply to turn off the breaker to the 12V charger when you're running off the inverter.
Except, of course, the inverter you're talking about has a built in charger and transfer switch. In that case you can completely remove the existing 12V charger and not worry about it at all.
In fact, since your inverter has a built in transfer switch you won't need the 30A plug at all: As soon as "shore power" goes away the transfer switch in the inverter will switch over (if you have the inverter turned on).
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