Sounds like wrong approach. Usually for adding an inverter to begin it needs to b one that is designed for an RV or marine installation. Ground and neutral bonding also need to be managed. The normal approach is for a branch circuit for feed an inverter or inverter-charger which also includes an automatic pass-through relay. Then the circuits that are intended to be feed by the inverter, get move to the inverter output. Since most RV circuits are either 15 or 20 amp, if the feed through or the inverter output is greater than those circuits then a panel is usually added, fed by the inverter, and then the needed branch circuits fed from that panel.
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Dennis
Bohemia NY
2008 Nimbus 342 SE Carlyle
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