I forgot to answer your question.

How about a relay operated by the output of the inverter that would unpower
the shore power cord.  But that would use coil power whenever your inverter
was on.

How about a relay that only connects the shore power cable to the boat (and
disconnects the inverter) when shore power is available.

Maybe connect the relay (a DPDT type) coil to the shore power cable and the
NO contacts, the boat to the moving contacts and the inverter to the NC
contacts.  


Norm
S/V Bandersnatch

. This, however, means that the male plug
> that goes to shore is _live_ when my AC system is being driven by the
> on-board inverter.
>
> Now, yes, I *should* be aware enough to cut off the inverter before
> hooking into external power or even handling the plug (which is normally
> kept in a recessed tube designed for the purpose) - and I usually am
> - but for things like this, I strongly prefer some kind of an automatic
> system that prevents getting shocked (or frying the inverter.)


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