the internal 20amp rated transfer relay/switch is only for the flow of amps THRU the inverter, which can only output about that amount - where and how you are 'plugged in' will make no difference, since the flow of amps will already be going thru a 20amp breaker in your panel box, or sub-panel.
Mine has a 30amp limit, and the breaker that feeds the Inverter sub-panel breakers is also 30amp... so they are both 'protecting' each other.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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