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Not a good idea, IMHO.
Need more info re: your boat, battery bank size/type, and anticipated 12V DC house loads, but the short answer is you should cut your losses with the batt. charger you have (put it on eBay) and get one which is properly sized to both charge the batteries and supply house loads while on shorepower.
Chargers don't have to be expensive to be good. For many boats, the Iota line of chargers (they have sizes from 15A to 90A) are excellent, sophisticated, and relatively inexpensive.
Bill
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