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The PDC is a shore power charger combined with a fuse panel and breaker box. If you ran the (separate) inverter from the battery with the PDC charging there would be no interruption in power when you pulled shore power.

However, there are some efficiency losses since AC is always converted from DC there is not a transfer switch to run the van's AC direct from the shore power.

This could be an issue for high loads like air conditioning.
 
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