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Peter Kennedy has been in  business since 1991 designing, installing and servicing marine electrical systems. The purpose of this blog is to offer support to both professional installers and  do-it-yourself boat owners who wish to undertake this work themselves.

Peter Kennedy has been in  business since 1991 designing, installing and servicing marine electrical systems. The purpose of this blog is to offer support to both professional installers and  do-it-yourself boat owners who wish to undertake this work themselves.

What is a galvanic isolator and why should my shore power system have one?

Posted by Liam Kennedy on 1/21/2019 to Corrosion
A galvanic isolator is a device used to block low voltage DC currents coming on board your boat on the shore power ground wire.  These currents could cause corrosion to your underwater metals; through hulls, propeller, shaft etc.

How to test a galvanic isolator that doesn't have a monitoring system

Posted by Liam Kennedy on 1/21/2019 to Corrosion
Galvanic isolators are a bit difficult to test.  Current ABYC standards require that galvanic isolators be self testing.  For testing older isolators without this feature there are a number of methods that can be used, the one that follows is one that I found most useful.

Isolation Transformer or Galvanic Isolator - which is preferable?

Posted by Peter Kennedy on 10/24/2014 to Corrosion
A discussion on the relative merits of transformers and galvanic isolators