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Old 10-11-2012, 09:09 PM   #9
Marin
Scraping Paint
 
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Join Date: Oct 2007
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We had one installed on our boat. While it protects the boat from stray current in the dock power it does not protect against stray current in the water. For that, you need an isolation transformer, which is way expensive. But a galvanic isolator is a good thing to have, particularly if the marina's or harbor's shorepower system is iffy or if someone on the dock has a faulty electrical system that's letting power leak into the ground leg of the dock power.
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